dougal

• Galland, Olivier; Chiacchiera, Sabina; Cal, Hernán de la; Jerram, Dougal Alexander; Lombardo, Ezequiel & Palma, J. Octavio [Show all 12 contributors for this article] (2026). The impacts of volcanism on hydrocarbon-bearing sedimentary basins - Examples from the world-class Neuquén Basin case study, Argentina. Global and Planetary Change. ISSN 0921-8181. 257. doi: 10.1016/j.gloplacha.2025.105218. Full text in Research Archive Show summary

  The last two decades of research have highlighted that volcanism occurring in sedimentary basins can have substantial effects on sedimentary formations. In particular, igneous intrusions can trigger the generation of large amounts of greenhouse gases in organic-rich host rocks, leading to dramatic climate change and mass extinctions. Volcanism can also have significant impacts on hydrocarbon-bearing sedimentary basins. The Neuquén Basin, Argentina, is a well-studied example of a hydrocarbon-producing sedimentary basin hosting massive volcanism. The combination of substantial industry subsurface data and high-quality outcrops makes the Neuquén Basin an exceptional geological object to study magma-sedimentary rock interactions and their implications to hydrocarbon systems. This contribution reviews well-studied examples from the Neuquén Basin that illustrate: (1) thermal effects of sills on maturation of the organic matter of the source rock, (2) fracturing processes in igneous intrusions and the host rock, (3) sills as producing fractured reservoirs, (4) intrusion-induced doming as structural trap or as potential fractured reservoir, (5) fluid migration along igneous intrusions, (6) reservoir compartmentalization induced by dykes, (7) generation of bitumen dykes in vicinity of intrusions, and (8) improvement of geophysical imaging using large-scale outcrops. All in all, our review documents various effects of magma-rock interactions in hydrocarbon-bearing sedimentary basins, and highlights the significant scientific value of the Neuquén Basin as a world-class case study for unravelling processes of magma-rock interactions in hydrocarbon-bearing sedimentary basins.

• Lombardo, E.F.; Jerram, Dougal Alexander; Yagupsky, D. & Galland, Olivier (2025). Seismic imaging of sub-vertical dykes and dyke/sill transitions in sedimentary basins: A case study from miocene volcanic complexes in the Neuquén Basin, Argentina. Global and Planetary Change. ISSN 0921-8181. 255. doi: 10.1016/j.gloplacha.2025.105126. Full text in Research Archive Show summary

  Seismic reflection has proven to be a powerful tool for imaging sub-horizontal or inclined magma conduits emplaced in sedimentary basins; however, the imaging of subvertical dykes remains significantly more challenging. Nevertheless, imaging dykes in sedimentary basins is essential, as these structures are fundamental components of volcanic plumbing systems and can exert a substantial influence on subsurface fluid migration. This study introduces a novel seismic interpretation workflow designed to enhance the three-dimensional imaging of subvertical igneous dykes within sedimentary basins. The proposed approach utilizes seismic attributes, specifically Ant Tracking applied to Variance and Amplitude Contrast volumes. The workflow was applied to a 3D seismic reflection dataset from the El Trapial hydrocarbon concession, Neuquén Basin, Argentina, enabling the extraction of thin, three-dimensional geobodies interpreted as dykes. Furthermore, the integration of 3D imaging and mapping of associated sills within the same basin yields new insights into the three-dimensional relationships between sills and their feeder dykes. The interpretation of subsurface dykes and dyke/sill transitions is validated by satellite imagery and direct field observations. This workflow is applicable to other sedimentary basins with buried volcanic plumbing systems.

• Lombardo, Ezequiel Felipe; Jerram, Dougal Alexander; Yagupsky, Daniel & Galland, Olivier (2025). Seismic Imaging of Sub-Vertical Dykes and Dyke/Sill Transitions in Sedimentary Basins: A Case Study from Miocene Volcanic Complexes in the Neuquén Basin, Argentina. Social Science Research Network (SSRN). doi: 10.2139/ssrn.5281335. Full text in Research Archive Show summary

  Dykes and sills are fundamental elements of volcanic plumbing systems. When emplaced in sedimentary basins, igneous dykes and sills have significant implications for the structural integrity of the basin, can permanently re-modify basin geometries and effect key properties influencing a basins fluid migration pathways. Seismic reflection data have proved powerful to image sub-horizontal or inclined sills emplaced in sedimentary basins, whereas imaging sub-vertical dykes is much more challenging. As such the role of dykes in sub-surface data can be underestimated and our understanding of the connections between dykes feeding sills and visa-versa within the magma plumbing system is poorly constrained. This study presents a novel seismic interpretation method aimed at enhancing the three-dimensional imaging of subvertical igneous dykes emplaced within sedimentary basins. The proposed workflow implements seismic attributes Ant Tracking applied to Variance and Amplitude Contrast. We applied the workflow to a 3D seismic reflection volume from the El Trapial hydrocarbon concession, Neuquén Basin, Argentina, and show how 3D vertical thin geobodies of interpreted dykes can be extracted. When combined with 3D imaging and mapping of related sills within the same basin, we are able to provide new insights into the 3-dimensional relationship between sills and their feeder dykes. The Interpreted subsurface dykes and dyke/sill transitions are ground-truthed by both satellite imagery and direct field observations. The workflow proposed in this study can be applied to numerous other sedimentary basins hosting buried volcanic plumbing systems.

• Galland, Olivier; Chiacchiera, Sabina; Cal, Hernán de la; Jerram, Dougal Alexander; Lombardo, Ezequiel & Palma, J. Octavio [Show all 12 contributors for this article] (2025). The impacts of volcanism on hydrocarbon-bearing sedimentary basins - Examples from the world-class Neuquén Basin case study, Argentina. EarthArXiv preprint platform. 257. doi: 10.31223/x5c16f. Full text in Research Archive Show summary

  The last two decades of research have highlighted that volcanism occurring in sedimentary basins can have substantial effects on sedimentary formations. In particular, igneous intrusions can trigger the generation of large amounts of greenhouse gases in organic-rich host rocks, leading to dramatic climate change and mass extinctions. Volcanism can also have significant impacts on hydrocarbon-bearing sedimentary basins. The Neuquén Basin, Argentina, is an outstanding example of hydrocarbon-producing sedimentary basin hosting massive volcanism. The combination of substantial industry subsurface data and outstanding outcrops makes the Neuquén Basin a world-class geological object to study magma-sedimentary rock interactions and their implications to hydrocarbon systems. This contribution reviews well-studied examples from the Neuquén Basin that illustrate: (1) thermal effects of sills on maturation of the organic matter of the source rock, (2) fracturing processes in igneous intrusions and the host rock, (3) sills as producing fractured reservoirs, (4) intrusion-induced doming as structural trap or as potential fractured reservoir, (5) fluid migration along igneous intrusions, (6) reservoir compartmentalization induced by dykes, (7) generation of bitumen dykes in vicinity of intrusions, and (8) improvement of geophysical imaging using large-scale outcrops. All in all, our review (1) documents various effects of magma-rock interactions in hydrocarbon-bearing sedimentary basins, and (2) highlights the great scientific value of the Neuquén Basin as a world-class case study for unravelling processes of magma-rock interactions in hydrocarbon-bearing sedimentary basins.

• Abdelmalak, Mohamed Mansour; Rossetti, Lucas M.; Millett, John M.; Planke, Sverre; Jerram, Dougal Alexander & Faleide, Jan Inge [Show all 7 contributors for this article] (2025). Breakup Magmatism in the South Atlantic: Mechanisms and Implications. Earth-Science Reviews. ISSN 0012-8252. 264. doi: 10.1016/j.earscirev.2025.105088. Full text in Research Archive Show summary

  The Early Cretaceous opening of the South Atlantic Ocean was accompanied by extensive intrusive and extrusive magmatism collectively grouped in the South Atlantic Igneous Province (SAIP). The SAIP includes the onshore Paraná-Etendeka large igneous province (PELIP), offshore seaward-dipping reflectors sequences, the Rio Grande Rise and Walvis Ridge, and voluminous intrusive magmatism. Nonetheless, the nature of the processes that lead to continental breakup remain controversial, and the environmental impact of these events is not yet fully understood. In order to investigate the tectonomagmatic evolution of the South Atlantic, we present a new compilation of the various geochemical compositions and radiometric ages associated with the SAIP as well as an estimation of magma volumes constrained by extensive seismic, gravity, and magnetic datasets. The SAIP was formed during the Early Cretaceous, from the Valanginian to Albian (135–110 Ma), with the majority of the magmatic activity lasting c. 3.5 Myr interval between 135.5 and 132 Ma. Onshore magmatism is characterized by massive outpourings of tholeiitic basaltic flows formed by melting of hotter than normal mantle along with significant lithospheric thinning. Magma source compositions varied during magmatism with enriched “plume-like” components transitioning to more depleted “MORB-like” (Mid-Ocean-Ridge-Basalt) signatures. The total magma volume of the SAIP ranges between 10 × 106 km3 and 16 × 106 km3 with a striking asymmetry in volumes of the onshore and offshore volcanism along the conjugate margins. Offshore, ∼67 to 70 % of the total magma volume is located on the African side whereas 30 to 33 % of the total magma volume is located on the South American side. Onshore, ∼10 % of the total magma volume is located on the African side whereas 90 % of the total magma volume is located on the South American side. This asymmetry in volume distribution is attributed to different factors including variations in rifting mode, differences in initial lithospheric thickness, and structural inheritance. The geochemical data were analyzed and integrated to provide insights on magma generation and source compositions along with an updated geological model for the South Atlantic magmatism. The onset of the activity of the SAIP at the start of the Weissert Event suggests that the SAIP may have played a major role on the climatic and oceanographic changes during the mid-Valanginian.

• Lombardo, Ezequiel F.; Galland, Olivier; Yagupsky, Daniel & Jerram, Dougal Alexander (2024). Characterization of a structural trap associated with an intrusive complex: the El Trapial oilfield, Neuquén Basin, Argentina. Geological Society Special Publication. ISSN 0305-8719. 547(1), p. 291–320. doi: 10.1144/SP547-2023-98. Full text in Research Archive
• Millett, John M.; Rossetti, Lucas; Bischoff, Alan; Rossetti, Marcos; Rosenqvist, Marija Plahter & Avseth, Per Åge [Show all 11 contributors for this article] (2024). Lava flow-hosted reservoirs: a review. Geological Society Special Publication. ISSN 0305-8719. 547(1), p. 357–387. doi: 10.1144/SP547-2023-102. Full text in Research Archive Show summary

  Lava flows form important fluid reservoirs and have been extensively exploited for water aquifers, geothermal energy, hydrocarbon production and, more recently, for carbon storage. Effusive subaerial mafic to intermediate lava flows account for vast rock volumes globally, and form reservoirs with properties dictated by well-known lava flow facies ranging from pāhoehoe through several transitional forms to ‘a’ā lava. These variations in flow type lead to critical differences in the pore structure, distribution, connectivity, strength and fracturing of individual lava flows, which, alongside lava flow package architectures, determine primary reservoir potential. Lava flow margins with vesicular, fracture and often autobreccia-hosted pore structures can have porosities commonly exceeding 40% and matrix permeabilities over 10−11 m2 (>10 D) separated by much lower porosity and permeability flow interiors. Secondary post-emplacement physicochemical changes related to fracturing, meteoric, diagenetic and hydrothermal alteration can significantly modify reservoir potential through a complex interplay of mineral transformation, pore-clogging secondary minerals and dissolution, which must be carefully characterized and assessed during exploration and appraisal. Within this contribution, a review of selected global lava flow-hosted reservoir occurrences is presented, followed by a discussion of the factors that influence lava flow reservoir potential.

• Palma, Octavio Joakim; Burchardt, Steffi; Schmiedel, Tobias; Guerriero, Lucas; Jerram, Dougal Alexander & Mair, Karen [Show all 8 contributors for this article] (2024). Stratigraphy and structure of Chachahuén volcanic complex, southern Mendoza province, Argentina. Journal of South American Earth Sciences. ISSN 0895-9811. 140. doi: 10.1016/j.jsames.2024.104900. Full text in Research Archive
• Famelli, Natália; Millett, John; Hole, Malcolm; Jerram, Dougal Alexander; Oliveira, Leonardo C. de & Lima, Evandro F. [Show all 12 contributors for this article] (2024). Understanding the petrophysical properties, seismic responses and impacts of the basalt-sediment transition in prospective sedimentary basins. Journal of South American Earth Sciences. ISSN 0895-9811. 148. doi: 10.1016/j.jsames.2024.105113. Full text in Research Archive
• Whattam, Jack William; Midtkandal, Ivar; Jerram, Dougal Alexander; Callegaro, Sara & Svensen, Henrik Hovland (2024). The episodic onset of explosive and silicic-dominated volcanism in a continental rift; insights from the Permian Oslo Rift, Norway. Volcanica. 7(2), p. 925–951. doi: 10.30909/vol.07.02.925951. Full text in Research Archive Show summary

  The nature of rifting episodes and their associated volcanism mark key stratigraphic events in the evolution of volcano-sedimentary basins. Following the final assemblage of Pangea, the European region was subject to rifting and magmatism during crustal re-equilibration throughout the Permian. The aborted, partially eroded Oslo Rift is an excellent archive of this Permian magmatism, but the late-stage volcanological evolution is poorly understood. We present the first detailed documentation of a succession covering this period, with mafic lavas and volcaniclastic (tuff breccia) deposits, trachy-andesitic tuffs, and rheomorphic to moderately welded ignimbrites. Contrary to previous ideas, we show evidence suggesting the development of Strombolian-type scoria-cones, silicic fissure-fed eruptions, and major periods of rift-wide volcanic quiescence. Our observations highlight episodic silicic volcanism characterised by rapid evolution from high-grade ignimbrites to moderately and poorly welded ignimbrites. We infer rapid emptying of large, shallow silicic reservoirs and frequent source switching is responsible for the observed characteristics.

• Lisica, Karlo; Augland, Lars Eivind; Stevenson, John A.; Jerram, Dougal Alexander; Beresford-Browne, Adam & Jones, Morgan T. (2024). High-precision U–Pb geochronology of the Lundy igneous complex: implications for North Atlantic volcanism and the far-field Paleocene–Eocene ash record. Journal of the Geological Society. ISSN 0016-7649. 182(1). doi: 10.1144/jgs2023-140. Full text in Research Archive Show summary

  The Lundy Island (Bristol Channel, UK) granite is a felsic expression of the southernmost igneous centre of the North Atlantic Igneous Province that emplaced millions of cubic kilometres of magma during the Paleogene. The granite's distinctive S-type, peraluminous, two-mica ± garnet ± tourmaline composition has led to the hypothesis that eruptions from the Lundy volcanic centre may be the source of thick felsic ash layers within the early Eocene Fur Formation (Denmark) that act as key marker horizons for the onset and duration of the Paleocene–Eocene Thermal Maximum. This paper presents high-precision zircon U–Pb emplacement ages of 57.24 ± 0.11/0.12/0.13 Ma for the granite and 55.970 ± 0.021/0.030/0.070 Ma for a felsic ‘lundyite’ dyke. Trace and rare earth element patterns indicate close similarities between late-stage Lundy activity and ash layer −33 in Denmark. This ash layer was deposited during the Paleocene–Eocene Thermal Maximum carbon isotope excursion, suggesting that the Lundy volcanic centre is likely to be the source of this key ash horizon and that magmatism at Lundy likely continued into the early Eocene.

• Maharjan, Dwarika; Planke, Sverre; Bellwald, Benjamin; Millett, John M.; Abdelmalak, Mohamed Mansour & Manton, Ben [Show all 9 contributors for this article] (2024). Rapid loading and deformation of soft sediments during emplacement of a Lava Delta in the Vøring Basin, Mid-Norwegian Margin. Geological Society Special Publication. ISSN 0305-8719. 547(1), p. 465–482. doi: 10.6084/m9.figshare.c.6946691.v1. Full text in Research Archive
• Galland, Olivier; Villar, Héctor J.; Mescua, José; Jerram, Dougal Alexander; Messager, Gregoire Eugene Philippe & Medialdea, Adrian [Show all 11 contributors for this article] (2024). Structural control of igneous intrusions on fluid migration in sedimentary basins: the case study of large bitumen seeps at Cerro Alquitrán and Cerro La Paloma, northern Neuquén Basin, Argentina. Geological Society Special Publication. ISSN 0305-8719. 547(1), p. 231–259. doi: 10.1144/SP547-2023-115. Full text in Research Archive
• Galland, Olivier; Villar, Héctor J.; Mescua, José; Jerram, Dougal Alexander; Midtkandal, Ivar & Palma, J. Octavio [Show all 8 contributors for this article] (2023). The long-term legacy of subvolcanic intrusions on fluid migration in sedimentary basins: The Cerro Alquitrán case study, northern Neuquén Basin, Argentina. Basin Research. ISSN 0950-091X. 35(5), p. 1840–1855. doi: 10.1111/bre.12782. Full text in Research Archive Show summary

  Abstract Cooling subvolcanic igneous intrusions are known to have a substantial impact on fluid flow in the shallow Earth's crust, for example activation of geothermal systems, circulation of mineralized fluids in ore deposits, fast maturation of organic matter in sedimentary rocks and the potential release of large volumes of greenhouse gases, which have triggered mass extinctions during the Earth's history. However, the long‐term post‐cooling legacy of subvolcanic intrusions on fluid flow received much less attention. Here we describe a demonstrative geological example in the Andean foothills, Argentina, showing that igneous intrusions have long‐term effects on fluid flow after their emplacement and cooling. The case study is a ca. 11‐million‐year‐old, eroded subvolcanic conduit, at the rims of which large volumes of bitumen are naturally seeping out on the Earth's surface. This contribution highlights that intense syn‐emplacement fracturing of the magma has created high‐permeability pathways that affect the regional fluid circulations, even millions of years after cooling. Our observations reveal how extinct subvolcanic intrusions have long‐term consequences on subsurface fluid circulations, which need to be accounted for in the exploration of geothermal energy, drinkable groundwater, hydrocarbons and CO 2 sequestration in volcanic basins and regions hosting ancient shallow magma intrusions.

• Manton, Ben; Müller, Philipp; Mazzini, Adriano; Zastrozhnov, Dmitry; Jerram, Dougal Alexander & Millett, John M. [Show all 10 contributors for this article] (2022). Characterizing ancient and modern hydrothermal venting systems. Marine Geology. ISSN 0025-3227. 447. doi: 10.1016/j.margeo.2022.106781. Full text in Research Archive
• Marins, Gabriel M.; Parizek-Silva, Yaro; Millett, John M.; Jerram, Dougal Alexander; Rossetti, Lucas M.M. & Souza, Ariany de Jesus e [Show all 9 contributors for this article] (2022). Characterization of volcanic reservoirs; insights from the Badejo and Linguado oil field, Campos Basin, Brazil. Marine and Petroleum Geology. ISSN 0264-8172. 146. doi: 10.1016/j.marpetgeo.2022.105950. Full text in Research Archive
• Callegaro, Sara; Svensen, Henrik Hovland; Neumann, Else Ragnhild; Polozov, Alexander G.; Jerram, Dougal Alexander & Deegan, Frances M. [Show all 10 contributors for this article] (2021). Geochemistry of deep Tunguska Basin sills, Siberian Traps: correlations and potential implications for the end-Permian environmental crisis. Contributions to Mineralogy and Petrology. ISSN 0010-7999. 176. doi: 10.1007/s00410-021-01807-3. Full text in Research Archive Show summary

  Abstract A vast portion of the plumbing system of the Siberian Traps Large Igneous Province (STLIP) is emplaced in the Tunguska Basin, where borehole data reveal ubiquitous and abundant sills with great lateral extension. These intrusions intersect Cambrian–Ordovician evaporite, carbonate and siliciclastic series, and locally coal-bearing Permian host rocks, with a high potential for thermogenic gas generation. Here we present new geochemical data from 71 magmatic and 4 sedimentary rock samples from the Tunguska Basin center and periphery, recovered from 15 deep sills intercepted by boreholes. The studied samples are all low-Ti basalt and basaltic andesites, confirming absence of high-Ti and alkaline STLIP magmatism in the Tunguska Basin. The sills derive from picritic parental melts produced by extensive melting of a mantle source with recycled crustal components below a thinned lithosphere (50–60 km), within the spinel stability field. The mantle source was dominantly peridotitic, with enriched pyroxenitic domains formed by recycled lower crust, in agreement with previous models for the main tholeiitic STLIP phase. Limited amounts (up to 5%) of highly radiogenic granitoids or moderately radiogenic metapelites were assimilated in upper crustal magma reservoirs. After emplacement, sills intruded in Cambrian evaporites assimilated marlstones and interacted with the evaporitic host rocks, probably via fluids and brines. This is the first time that such process is described in subvolcanic rocks from all across the volcanic basin. The sills are correlated geochemically with the established chemostratigraphy for the on-craton STLIP lava piles and intrusions (Norilsk region). Sills correlated with the Morongovsky–Mokulaevsky Fm. and the Norilsk-type intrusions are the most voluminous, present all across the central Tunguska Basin, and bear the strongest evidence of interaction with evaporites. Massive discharge of thermogenic volatiles is suggested by explosive pipes and hydrothermal vent structures throughout the Tunguska Basin. We propose that this voluminous pulse of magmatism is a good candidate for the hitherto unidentified early intrusive phase of the STLIP, and may link the deep Tunguska basin sills to the end-Permian environmental crisis.

• Fyfe, Laura-Jane C.; Schofield, Nick; Holford, Simon P.; Jerram, Dougal Alexander & Hartley, Adrian J. (2021). Emplacement of the Little Minch Sill Complex, Sea of Hebrides Basin, NW Scotland. Journal of the Geological Society. ISSN 0016-7649. 178(3). doi: 10.1144/jgs2020-177. Full text in Research Archive
• Famelli, Natália; Millett, John; Hole, Malcolm; Lima, Evandro F.; Carmo, Isabela de O. & Jerram, Dougal Alexander [Show all 9 contributors for this article] (2021). Characterizing the nature and importance of lava-sediment interactions with the aid of field outcrop analogues. Journal of South American Earth Sciences. ISSN 0895-9811. 108. doi: 10.1016/j.jsames.2020.103108. Full text in Research Archive
• Torsvik, Trond Helge; Svensen, Henrik; Steinberger, Bernhard; Royer, Dana L.; Jerram, Dougal Alexander & Jones, Morgan Thomas [Show all 7 contributors for this article] (2021). Connecting the Deep Earth and the Atmosphere. Geophysical Monograph Series. ISSN 0065-8448. 263, p. 413–453. doi: 10.1002/9781119528609.ch16. Full text in Research Archive
• Eide, Christian Haug; Schofield, Nick; Howell, John Anthony & Jerram, Dougal Alexander (2021). Transport of mafic magma through the crust and sedimentary basins: Jameson Land, East Greenland. Journal of the Geological Society. ISSN 0016-7649. 179(3). doi: 10.1144/jgs2021-043. Full text in Research Archive Show summary

  Igneous sheet-complexes transport magma through the crust, but most studies have focused on single segments of the magma transport system or have low resolution. In the Jameson Land Basin in East Greenland, seismic reflection data and extensive outcrops give unparalleled constraints on mafic intrusions down to 15 km. This dataset shows how sill-complexes develop and how magma is transported from the mantle through sedimentary basins. The feeder zone of the sill-complex is a narrow zone below a basin, where a magmatic underplate body impinges on thinned crust. Magma is transported through the crystalline crust through dykes. Seismic data and published geochemistry indicate that magma is supplied from a magmatic underplate without perceptible storage in crustal magma chambers and crustal assimilation. As magma enters the sedimentary basin, it forms distributed, bowl-shaped sill-complexes throughout the basin. Large magma volumes in sills (4–20 times larger than the Skaergaard Intrusion) and the presence of few dykes highlight the importance of sills in crustal magma transport. On scales smaller than 0.2 km, host-rock lithology, and particularly mudstone tensile strength anisotropy, controls sill architecture in the upper 10 km of the basin, whereas sills are bowl-shaped below the brittle–ductile transition zone. On scales of kilometres and towards basin margins, tectonic stresses and lateral lithological changes dominate architecture of sills.

• Millett, John M.; Jerram, Dougal Alexander; Planke, Sverre; Mund, Bineet K.; Konar, Shubhodip & Sharda, Ruchika [Show all 8 contributors for this article] (2021). Volcanic facies architecture of early bimodal volcanism of the NW Deccan Traps: Volcanic reservoirs of the Raageshwari Deep Gas Field, Barmer Basin, India. Basin Research. ISSN 0950-091X. 33(6), p. 3348–3377. doi: 10.1111/bre.12605. Full text in Research Archive
• Millett, John M.; Jerram, Dougal Alexander; Manton, Ben; Planke, Sverre; Ablard, Peter & Wallis, Dirk [Show all 10 contributors for this article] (2021). The Rosebank Field, NE Atlantic: Volcanic characterisation of an inter-lava hydrocarbon discovery. Basin Research. ISSN 0950-091X. 33(6), p. 2883–2913. doi: 10.1111/bre.12585. Full text in Research Archive
• Millett, John M.; Manton, Ben M.; Zastrozhnov, Dmitrii; Planke, Sverre; Maharjan, Dwarika & Bellwald, Benjamin [Show all 16 contributors for this article] (2020). Basin structure and prospectivity of the NE Atlantic volcanic rifted margin: cross-border examples from the Faroe–Shetland, Møre and Southern Vøring basins. Geological Society Special Publication. ISSN 0305-8719. 495, p. 99–138. doi: 10.1144/SP495-2019-12. Full text in Research Archive
• Walker, Faye; Schofield, Nick; Millett, John; Jolley, Dave; Holford, Simon & Planke, Sverre [Show all 8 contributors for this article] (2020). Inside the volcano: Three-dimensional magmatic architecture of a buried shield volcano. Geology. ISSN 0091-7613. doi: 10.1130/G47941.1. Full text in Research Archive Show summary

  Abstract The nature and growth of magmatic plumbing systems are of fundamental importance to igneous geology. Traditionally, magma chambers have been viewed as rapidly emplaced bodies of molten rock or partially crystallized “magma mush” connected to the surface by a narrow cylindrical conduit (referred to as the “balloon-and-straw” model). Recent data suggest, however, that magma chambers beneath volcanoes are formed incrementally through amalgamation of smaller intrusions. Here we present the first high-resolution three-dimensional reconstruction of an ancient volcanic plumbing system as a large laccolithic complex. By integrating seismic reflection and gravity data, we show that the ∼200 km3 laccolith appears to have formed through partial amalgamation of smaller intrusions. The complex appears to have fed both surface volcanism and an extensive sill network beneath the volcanic edifice. Numerous sills are imaged within the volcanic conduit, indicating that magma stalled at various levels during its ascent. Our results reveal for the first time the entire multicomponent plumbing system within a large ancient shield volcano.

• Pierdominici, Simona; Millet, John M.; Kück, Jochem K. M.; Thomas, Donald; Jerram, Dougal Alexander & Planke, Sverre [Show all 9 contributors for this article] (2020). Stress Field Interactions Between Overlapping Shield Volcanoes: Borehole Breakout Evidence From the Island of Hawai'i, USA. Journal of Geophysical Research (JGR): Earth Surface. ISSN 2169-9003. 125(8). doi: 10.1029/2020JB019768. Full text in Research Archive Show summary

  Knowledge of the in situ stress state of the Earth's crust plays a key role in understanding geological processes including plate tectonics, earthquakes, slope failure, and igneous emplacement. In this paper, we determine the in situ stress orientation from the PTA2 borehole on the island of Hawai'i, drilled into a lava flow dominated sequence between Mauna Kea and Mauna Loa. High‐resolution acoustic images were collected from the open hole interval 886 m to 1,567 m. Based on identification of 371 borehole breakouts for a total length of 310 m, the mean orientation of the minimum horizontal principal stress is N106° and remains constant across different volcanic rock fabrics. Changes in borehole breakout shape are linked to the different strength of volcanic facies and intra‐facies. The orientation of the present‐day stress field at Mauna Kea deviates from the plate forces and regional tectonic stress field. We interpret the compressive stress regime at the PTA2 site as resulting from the competing gravitational fields of the large topographic highs of Mauna Kea and Mauna Loa. Our study reveals that the mass accumulation associated with shield volcano growth imparts significant local variations to the subsurface stress state on volcanic islands consisting of overlapping shield volcanoes. The results have significant implications for stress accumulation leading to brittle failure and flank collapse, along with potentially influencing magma accumulation and ascent pathways during volcanic island evolution. This study provides the first insights into the orientation of the present‐day stress field between the major island forming shield volcanoes of Hawai'i.

• Svensen, Henrik; Hammer, Øyvind; Chevallier, Luc; Jerram, Dougal Alexander; Silkoset, Petter & Polteau, Stephane [Show all 7 contributors for this article] (2020). Understanding thermogenic degassing in large igneous provinces: Inferences from the geological and statistical characteristics of breccia pipes in the western parts of the Karoo Basin. In Adatte, Thierry; Bond, David P.G. & Keller, Gerta (Ed.), Mass extinctions, volcanism, and impacts. The Geological Society of America. ISSN 9780813725444. p. 67–84. Full text in Research Archive
• Svensen, Henrik; Jerram, Dougal Alexander; Polozov, Alexander; Planke, Sverre; Neal, Clive R. & Augland, Lars Eivind [Show all 7 contributors for this article] (2019). Thinking about LIPs: A brief history of ideas in Large igneous province research. Tectonophysics. ISSN 0040-1951. 760, p. 229–251. doi: 10.1016/j.tecto.2018.12.008. Full text in Research Archive Show summary

  Large igneous provinces (LIPs) are extraordinary igneous and tectonic events that have influenced the planet in profound ways, including the major turnovers in the history of life. The LIP concept, definitions, and terminology first nucleated in a 1990 workshop jointly arranged by Joint Oceanographic Institutions and U.S. Science Support Program, subsequently presented in a series of seminal papers by Millard F. Coffin and Olav Eldholm in the early 1990's. They combined existing data and information from continental flood basalts with the emerging geophysical understanding of oceanic plateaus and rifted continental margins. The new terminology had major implications within the geosciences and beyond. However, when investigating how geoscientists described and interpreted these vast provinces prior to the 1990's, we are left with a series of questions. Who first realized that LIPs represent extraordinary events in the history of the Earth, what terminology was used, and why were geologists interested in this type of events? Here we discuss some of the key developments in LIP research, including mapping projects, expeditions, international programs, correlations across continents, and the history of the terminology. We focus our discussion on four cases, the Karoo LIP, the Siberian Traps, the North Atlantic Igneous Province, and the Ontong Java Plateau, comprising key examples of LIPs with long histories of study and exploration. We conclude that the past 150 years of LIP-related research and endeavor was largely driven by a need to understand fundamental aspects of Earth evolution, including continental drift, plate tectonic reconstructions, the origin of basalt, mantle processes and plumes, and the role of volcanism in driving mass extinctions and climatic changes.

• Jerram, Dougal Alexander; Millett, John M; Kück, Jochem; Thomas, Donald; Planke, Sverre & Haskins, Eric [Show all 8 contributors for this article] (2019). Understanding volcanic facies in the subsurface: A combined core, wireline logging and image log data set from the PTA2 and KMA1 boreholes, Big Island, Hawaii. Scientific Drilling. ISSN 1816-8957. 25, p. 15–33. doi: 10.5194/sd-25-15-2019. Full text in Research Archive Show summary

  To help understand volcanic facies in the subsurface, data sets that enable detailed comparisons between down-hole geophysical data and cored volcanic intervals are critical. However, in many cases, the collection of extended core intervals within volcanic sequences is rare and often incomplete due to challenging coring conditions. In this contribution we outline and provide initial results from borehole logging operations within two fully cored lava-dominated borehole sequences, PTA2 and KMA1, on the Big Island of Hawai`i. Data for spectral gamma, magnetic susceptibility, dipmeter resistivity, sonic, total magnetic field, temperature and televiewer wireline logs were successfully acquired for the open hole interval ca. 889 m to 1567 m within the PTA2 borehole. Spectral gamma was also collected from inside the casing of both wells, extending the coverage for PTA2 to the surface and covering the interval from ca. 300 to 1200 m for KMA1. High-quality core material was available for both boreholes with almost complete recovery which enabled high-resolution core-to-log integration. Gamma data are generally low commonly in the range ca. 7–20 gAPI but are shown to increase up to API of ca. 60 with some intrusions and with increases in hawaiite compositions in the upper part of PTA2. Velocity data are more variable due to alteration within porous volcanic facies than with burial depth, with a general degrease down-hole. The high-resolution televiewer data have been compared directly to the core, enabling a comprehensive analysis of the variations in the televiewer responses. This has enabled the identification of key features including individual vesicles, vesicle segregations, strained vesicles, chilled margins, rubble zones, intrusive contacts and pāhoehoe lobe morphologies, which can be confidently matched between the televiewer data and the full diameter core. The data set and results of this study include findings which should enable improved borehole facies analysis through volcanic sequences in the future, especially where down-borehole data and images but no core are available.

• Burchardt, Steffi; Mattsson, Tobias; Palma, J Octavio; Galland, Olivier; Almqvist, Bjarne & Mair, Karen [Show all 9 contributors for this article] (2019). Progressive Growth of the Cerro Bayo Cryptodome, Chachahuen Volcano, Argentina?Implications for Viscous Magma Emplacement. Journal of Geophysical Research (JGR): Solid Earth. ISSN 2169-9313. 124(8), p. 7934–7961. doi: 10.1029/2019JB017543. Full text in Research Archive
• Augland, Lars Eivind; Ryabov, Viktor V.; Vernikovsky, Valery A.; Planke, Sverre; Polozov, Alexander & Callegaro, Sara [Show all 8 contributors for this article] (2019). The main pulse of the Siberian Traps expanded in size and composition. Scientific Reports. 9. doi: 10.1038/s41598-019-54023-2. Full text in Research Archive Show summary

  Emplacement of large volumes of (sub)volcanic rocks during the main pulse of the Siberian Traps occurred within <1 m.y., coinciding with the end-Permian mass extinction. Volcanics from outside the main Siberian Traps, e.g. Taimyr and West Siberia, have since long been correlated, but existing geochronological data cannot resolve at a precision better than ~5 m.y. whether (sub)volcanic activity in these areas actually occurred during the main pulse or later. We report the first high precision U-Pb zircon geochronology from two alkaline ultramafic-felsic layered intrusive complexes from Taimyr, showing synchronicity between these and the main Siberian Traps (sub)volcanic pulse, and the presence of a second Dinerian-Smithian pulse. This is the first documentation of felsic intrusive magmatism occurring during the main pulse, testifying to the Siberian Trap’s compositional diversity. Furthermore, the intrusions cut basal basalts of the Taimyr lava stratigraphy hence providing a minimum age of these basalts of 251.64 ± 0.11 Ma. Synchronicity of (sub)volcanic activity between Taimyr and the Siberian Traps imply that the total area of the Siberian Traps main pulse should include a ~300 000 km2 area north of Norilsk. The vast aerial extent of the (sub)volcanic activity during the Siberian Traps main pulse may explain the severe environmental consequences.

• Wakeford, Zoe E; Chmielewska, Magda; Hole, Malcolm J; Howell, John A. & Jerram, Dougal Alexander (2019). Combining thermal imaging with photogrammetry of an active volcano using UAV: an example from Stromboli, Italy. Photogrammetric Record. ISSN 0031-868X. 34(168), p. 445–466. doi: 10.1111/phor.12301. Full text in Research Archive Show summary

  Volcanoes are a potential hazard to over 750 million people worldwide. Accessing them to install monitoring equipment can be logistically challenging and dangerous. Traditional monitoring equipment is expensive and not available to many local communities. A new, low‐cost method is proposed to address these challenges using a unique 3D thermal photogrammetric modelling workflow. The data acquisition and processing part of this workflow has been tested on Stromboli, a volcano in the Aeolian Islands of Italy. Unmanned aerial vehicles (UAVs) were deployed at the volcano to acquire both visible and thermal infrared imagery. Both datasets were then digitally processed to produce 3D virtual outcrop models. Finally, the two datasets and models were integrated to produce the first 3D thermal photogrammetric model of an active volcano. The result is an easy‐to‐use workflow applicable to any volcano. This low‐cost monitoring system could be deployed in developing countries and remote areas otherwise hindered by limited budgets and poor access.

• Rossetti, Lucas; Healy, David; Hole, Malcolm J; Millett, John M; Lima, Evandro F de & Jerram, Dougal Alexander [Show all 7 contributors for this article] (2019). Evaluating petrophysical properties of volcano-sedimentary sequences: A case study in the Parana-Etendeka Large Igneous Province. Marine and Petroleum Geology. ISSN 0264-8172. 102, p. 638–656. doi: 10.1016/j.marpetgeo.2019.01.028. Full text in Research Archive
• Hansen, Jogvan; Davidson, Jon; Jerram, Dougal Alexander; Ottley, Christopher & Widdowson, Mike (2019). Contrasting TiO2 Compositions in Early Cenozoic Mafic Sills of the Faroe Islands: An Example of Basalt Formation from Distinct Melting Regimes. Earth Sciences. ISSN 2328-5974. 8(5), p. 235–267. doi: 10.11648/j.earth.20190805.11. Full text in Research Archive
• Greenfield, L.; Millett, John M; Howell, J.A.; Jerram, Dougal Alexander; Watton, Timothy J. & Healy, D [Show all 8 contributors for this article] (2019). The 3D facies architecture and petrophysical properties of hyaloclastite delta deposits: An integrated photogrammetry and petrophysical study from southern Iceland. Basin Research. ISSN 0950-091X. 32(5), p. 1081–1104. doi: 10.1111/bre.12415. Full text in Research Archive
• Berndt, Christian; Planke, Sverre; Teagle, Damon; Huismans, Ritske; Torsvik, Trond Helge & Frieling, Joost [Show all 12 contributors for this article] (2019). Northeast Atlantic breakup volcanism and consequences for Paleogene climate change – MagellanPlus Workshop report. Scientific Drilling. ISSN 1816-8957. 26, p. 69–85. doi: 10.5194/sd-26-69-2019. Full text in Research Archive Show summary

  The northeast Atlantic encompasses archetypal examples of volcanic rifted margins. Twenty-five years after the last ODP (Ocean Drilling Program) leg on these volcanic margins, the reasons for excess melting are still disputed with at least three competing hypotheses being discussed. We are proposing a new drilling campaign that will constrain the timing, rates of volcanism, and vertical movements of rifted margins. This will allow us to parameterise geodynamic models that can distinguish between the hypotheses. Furthermore, the drilling-derived data will help us to understand the role of breakup magmatism as a potential driver for the Palaeocene–Eocene thermal maximum (PETM) and its influence on the oceanographic circulation in the earliest phase of the northeast Atlantic Ocean formation. Tackling these questions with a new drilling campaign in the northeast Atlantic region will advance our understanding of the long-term interactions between tectonics, volcanism, oceanography, and climate and the functioning of subpolar northern ecosystems and climate during intervals of extreme warmth.

• Svensen, Henrik; Frolov, Sergei; G., Akhmanov; Polozov, Alexander; Jerram, Dougal Alexander & Shiganova, O. [Show all 9 contributors for this article] (2018). Sills and gas generation in the Siberian Traps. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. ISSN 1364-503X. 376(2130). doi: 10.1098/rsta.2017.0080. Full text in Research Archive
• Planke, Sverre; Rabbel, Ole; Galland, Olivier; Millet, John; Manson, Ben & Jerram, Dougal Alexander [Show all 8 contributors for this article] (2018). Seismic imaging and petroleum implications of igneous intrusions in sedimentary basins constrained by outcrop analogues and seismic data from the Neuquén Basin and the NE Atlantic. In Vernengo, Luis; Atencio, Mario; Branca, Marcela; Corti, Eduardo; D'Biassi, Tomás; Enrique, Jorge Dario; Torrejón, Maximiliano García; Pianelli, Luis; Ricardi, Alberto; Soubiés, Daniel & Späth, Federico (Ed.), 10 Congreso de Exploración y Desarrollo de Hidrocarburos - Simposio de Geofísica: La geofísica como vinculo entre el conocimiento de la tierra y la sociedad. Instituto Argentino del Petroleo y del Gas. ISSN 9789879139929. p. 343–366. Full text in Research Archive
• Vries, Ben van Wyk de; Byrne, Paul; Delcamp, Audray; Einarson, Pall; Göğüş, Oğuz & Guilbaud, Marie-Noelle [Show all 17 contributors for this article] (2018). A global framework for the Earth: Putting geological sciences in context. Global and Planetary Change. ISSN 0921-8181. 171, p. 293–321. doi: 10.1016/j.gloplacha.2017.12.019. Full text in Research Archive Show summary

  We propose a global framework for the Earth system to facilitate communication between the geoscience community, the public and policy makers. Geoscience research aims to understand the history and evolution of the Earth system. This combines the non-living and living parts of the Earth, especially through interactions of the lithosphere, biosphere and atmosphere as well as the other parts of the system, such as the asthenosphere, core and extraterrestrial influences. Such research considers a system that spans scales from microscopic (micrometer scale) to megascopic (many 1000 s of km scale), and from milliseconds to millions of years. To connect different parts of this immense system, we habitually use a wide range of ad hoc geological frameworks, systems and geological environment models, where different processes and features operate and combine. In consequence, one way to judge the significance of our work, and to increase its value, is to assess how the elements studied are integrated within the whole Earth system. This allows us to see what implications any study has for this greater Earth system. To do this successfully, our research needs a standard global framework to assess a study's relevance. However, such a global framework does not formally exist, and so this article looks at existing examples and proposes one that can systematically place research into a global geological context. This proposed framework has the advantage of being useful for communicating geological processes to other disciplines, and can be used for any type of Earth (or planetary) environment. This framework is a fundamental tool for geoscience communication and for outreach, especially through geological heritage (geoheritage). Geoheritage concerns the valuing and protection of geoscience and geological sites, and is a vital tool for communicating geoscience. It can be used to communicate our knowledge of global change, providing, through landscapes and outcrops, a story that renders the concepts and advances of geoscience accessible. Like our basic research, the concept of geoheritage evolves as our understanding of the Earth progresses, and these dual changes can be explained with the global framework. Geoheritage is a global activity and it needs a global framework to put sites into context. A revision of the UNESCO geological thematic studies was called for by the World Heritage Committee in 2014 (decision: 38 COM 8B.11), and this can be done with the input from the full geoscience community using this global geological framework. Thus, for research, geoscience policy and for geoheritage, a global framework is now needed. The proposed framework can place any site in its geological environment, related to its lithospheric plate tectonic setting and its history. The framework has a solid-earth bias (lithosphere), but includes all other spheres, such as the biosphere and anthropogenic activity. Extraterrestrial influences, like solar variations and metorite impacts are included. The framework is phenomenological, due to the necessity of grouping the features that we see, but these phenomena provide evidence of processes that we cannot see. The basic format is a table, a sketch of the Earth and a system diagram, three complementary and most powerful ways of depicting a system. A timeline, or stratigraphic column can be included, to show the evolution of geological history, and the table can be used as a ‘game board’ where one site migrates across from one set of conditions to another over time. The global framework allows any research site, area or subject to be set in the Earth's system, in a way that gives it context, allows comparisons and provides significance. We suggest that it can be a template for an internationally accepted version used to consolidate the necessary geoscience – geoheritage link and promote outreach.

• Polteau, Stephane; Mazzini, Adriano; Hansen, Geir; Planke, Sverre; Jerram, Dougal Alexander & Millett, John [Show all 9 contributors for this article] (2018). The pre-breakup stratigraphy and petroleum system of the Southern Jan Mayen Ridge revealed by seafloor sampling. Tectonophysics. ISSN 0040-1951. 760, p. 152–164. doi: 10.1016/j.tecto.2018.04.016. Full text in Research Archive Show summary

  The Jan Mayen Microplate Complex (JMMC) in the NE Atlantic is interpreted to mostly consist of continental fragments with possible interstitial embryonic oceanic crust. A complex Cenozoic rifting history accompanied by extensive extrusive and intrusive volcanism have made the geological characterization of the JMMC challenging especially due to poor seismic imaging beneath the breakup basalt succession. The presence of continental crust in the JMMC is inferred by seismic and magnetic data, but ground truthing evidence have yet to be provided. Here, we present the results from a seafloor sampling campaign undertaken in 2011 on the Southern Jan Mayen Ridge complex. Seabed samples were recovered using a gravity corer and a dredge along a 1000 m high escarpment with a 19° slope. Sampling locations were selected based on the interpretation of seismic profiles that suggest the presence of possible pre-breakup successions outcropping along this steep escarpment. Results include a sequence of samples with age diagnostic palynomorph assemblages ranging from Permian/Triassic to Eocene, and including igneous samples related to the Early Eocene breakup volcanism. Importantly, the samples were retrieved from hard substrate in an erosional gully lacking overburden sediments and have ages arranged in younging upward sequential order, supporting their near in-situ position. The sampling results were integrated into a lithostratigraphic pseudo-well that can be used to constrain the evolution and breakup of the JMMC. Additionally, evidence for active migration of Jurassic sourced hydrocarbons comprise the first indication of a working hydrocarbon system, with important implications for the petroleum prospectivity of the Dreki area. Finally, these results confirm that the Southern Jan Mayen Ridge is indeed a sliver of continental crust.

• Svensen, Henrik; Torsvik, Trond Helge; Callegaro, Sara; Augland, Lars Eivind; Heimdal, Thea Hatlen & Jerram, Dougal Alexander [Show all 8 contributors for this article] (2018). Gondwana large igneous provinces: plate reconstructions, volcanic basins and sill volumes. In: Large Igneous Provinces from Gondwana and Adjacent Regions. Geological Society Special Publication. ISSN 0305-8719. 463, p. 17–40. doi: 10.1144/SP463.7. Full text in Research Archive
• Millett, J.M.; Planke, Sverre; Kastner, Felix; Blischke, A; Hersir, Gylfi Pall & Halldorsdottir, Sæunn [Show all 17 contributors for this article] (2018). Sub-surface geology and velocity structure of the Krafla high temperature geothermal field, Iceland: Integrated ditch cuttings, wireline and zero offset vertical seismic profile analysis. Journal of Volcanology and Geothermal Research. ISSN 0377-0273. 391. doi: 10.1016/j.jvolgeores.2018.03.024. Full text in Research Archive
• Abdelmalak, Mohamed Mansour; Planke, Sverre; Polteau, Stephane; Hartz, Ebbe Hvidegård; Faleide, Jan Inge & Tegner, Christian [Show all 9 contributors for this article] (2018). Breakup volcanism and plate tectonics in the NW Atlantic. Tectonophysics. ISSN 0040-1951. 760, p. 267–296. doi: 10.1016/j.tecto.2018.08.002. Full text in Research Archive
• Jerram, Dougal Alexander; Sharp, Ian; Torsvik, Trond Helge; Poulsen, Ragnar; Watton, Timothy J. & Freitag, Ulrike [Show all 15 contributors for this article] (2018). Volcanic constraints on the unzipping of Africa from South America: Insights from new geochronological controls along the Angola margin. Tectonophysics. ISSN 0040-1951. doi: 10.1016/j.tecto.2018.07.027. Full text in Research Archive
• Hafeez, Amer; Planke, Sverre; Jerram, Dougal Alexander; Millett, John M; Maharjan, Dwarika & Prestvik, Tore (2017). Upper paleocene ultramafic igneous rocks offshore mid-Norway: Re-interpretation of the vestbrona formation as a sill complex. Interpretation. ISSN 2324-8858. 5(3), p. SK103–SK120. doi: 10.1190/int-2016-0143.1. Full text in Research Archive Show summary

  Continental breakup between NW Europe and Greenland (~56 Ma) ago was associated with widespread magmatism. Silica undersaturated alkaline porphyritic igneous rocks of a similar age have previously been dredged near the mid-Norwegian coast. These igneous rocks of the Vestbrona Formation have previously been interpreted as either igneous plugs or volcanic flows. New 3D seismic data show that relatively small sill complexes are abundant in the same region. In total, 36 sills with a size of 0.1 to 9 km2 have been mapped. In addition, ten seismic horizons were interpreted and tied to nearby wells to obtain a robust stratigraphic framework. The sills mainly intrude Cretaceous and Paleocene sequences, however, one sill is also identified in the pre-Cretaceous sequences. The sills locally form erosional remnants on the seabed due to massive uplifting and erosion of the continental margin. Vintage igneous and sedimentary dredge samples have been re-analyzed, including petrography, geochemistry (XRF, XRD), biostratigraphy, and Ar-Ar geochronology. The new Ar-Ar data suggest that the sills are 1-2 Ma older than breakup (ca. 57-58 Ma). Furthermore, the biostratigraphy and petrography of two sediment samples suggest that the samples were collected from near in-situ subcrops and not of an ice rafted origin. The sediment samples are of Danian age, and are strongly metamorphosed, most likely by contact metamorphism resulting from heating during sill emplacement. The newly identified sills have implications for the petroleum prospectivity of the study area including source rock maturation within thermal aureoles and the long term alteration of fluid migration pathways.

• Kjoberg, Sigurd; Schmiedel, Tobias; Planke, Sverre; Svensen, Henrik; Millett, John & Jerram, Dougal Alexander [Show all 11 contributors for this article] (2017). 3D structure and formation of hydrothermal vent complexes at the paleocene-eocene transition, the Møre basin, MID-Norwegian margin. Interpretation. ISSN 2324-8858. 5(3), p. SK65–SK81. doi: 10.1190/int-2016-0159.1. Full text in Research Archive Show summary

  The mid-Norwegian margin is regarded as an example of a volcanic-rifted margin, formed prior to and during, Paleogene breakup of the northeast Atlantic. The area is characterized by the presence of voluminous basaltic complexes such as extrusive lava and lava delta sequences, intrusive sills and dikes, and hydrothermal vent complexes. We have developed a detailed 3D seismic analysis of fluid-and gas-induced hydrothermal vent complexes in a 310 km2 area in the Møre Basin, offshore Norway. We find that formation of hydrothermal vent complexes is accommodated by deformation of the host rock when sills are emplaced. Fluids are generated by metamorphic reactions and pore-fluid expansion around sills and are focused around sill tips due to buoyancy. Hydrothermal vent complexes are associated with doming of the overlying strata, leading to the formation of draping mounds above the vent contemporary surface. The morphological characteristics of the upper part and the underlying feeder structure (conduit zone) are imaged and studied in 3D seismic data. Well data indicate that the complexes formed during the early Eocene, linking their formation to the time of the Paleocene-Eocene thermal maximum at c. 56 Ma. The well data further suggest that the hydrothermal vent complexes were active for a considerable time period, corresponding to a c. 100 m thick transition zone unit with primary Apectodinium augustum and redeposited very mature Cretaceous and Jurassic palynomorphs. The newly derived understanding of age, structure, and formation of hydrothermal vent complexes in the Møre Basin contributes to the general understanding of the igneous plumbing system in volcanic basins and their implications for the paleoclimate and petroleum systems.

• Corseri, Romain; Senger, Kim; Selway, Katherine; Abdelmalak, Mohamed Mansour; Planke, Sverre & Jerram, Dougal Alexander (2017). Magnetotelluric evidence for massive sulphide mineralization in intruded sediments of the outer Vøring Basin, mid-Norway. Tectonophysics. ISSN 0040-1951. 706-707, p. 196–205. doi: 10.1016/j.tecto.2017.04.011. Full text in Research Archive Show summary

  A highly conductive body (0.1–0.8 Ω·m) is identified at mid-crustal depth (8–13 km) in the north Gjallar Ridge from magnetotelluric (MT) data and further investigated in light of other remote-sensing geophysical data (seismic reflection, gravity, aeromagnetic). A commercial 3D controlled-source electromagnetic survey was conducted in the Vøring Basin in 2014 and, although primarily designed for hydrocarbon exploration, good quality MT data were extracted at periods ranging from 100 to 103 s. Dimensionality analysis indicates clear 1D to 2D characteristics in the MT data. 2D inversion was carried out on four profiles (totalling ~ 94 km) oriented perpendicular to the electromagnetic strike and one profile along strike (~ 45 km), using a 1D subset of the data. All inversions converged quickly to RMS values close to unity and display a very good agreement with borehole resistivity data from well 6705/10-1 located in the survey area. A striking feature on all profiles is a highly conductive (0.1–0.8 Ω·m) body at 8–13 km depth. To explain the prominent conductive anomaly, integration of geophysical data favours the hypothesis of electrical conduction across well-connected mineral network in pre-Cretaceous sediments. Seismic interpretation suggests a link between the conductor and intruded sedimentary successions below a detachment level and associated low-angle faults. In the Vøring Basin, low magnetic signal and temperature at the conductor's depth indicate that such thick mineral deposits could display non-magnetic behaviour while occurring well below the magnetite Curie isotherm (~ 585 °C). Natural occurrences and magnetic properties of common iron-sulphide minerals favour a geological interpretation of mid-crustal conductivity as thick pyrrhotite deposits formed in intrusion's contact metamorphic aureoles. Corseri, Romain, et al. "Magnetotelluric evidence for massive sulphide mineralization in intruded sediments of the outer Vøring Basin, mid-Norway." Tectonophysics 706 (2017): 196-205. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.

• Planke, Sverre; Millett, John M; Maharjan, Dwarika; Jerram, Dougal Alexander; Abdelmalak, Mohamed Mansour & Groth, Audun [Show all 9 contributors for this article] (2017). Igneous seismic geomorphology of buried lava fields and coastal escarpments on the Vøring volcanic rifted margin. Interpretation. ISSN 2324-8858. 5(3), p. SK161–SK177. doi: 10.1190/INT-2016-0164.1. Full text in Research Archive Show summary

  Voluminous igneous complexes are commonly present in sedimentary basins on volcanic rifted margins, and they represent a challenge for petroleum explorationists. A 2500 km2 industry-standard 3D seismic cube has recently been acquired on the Vøring Marginal High offshore mid-Norway to image subbasalt sedimentary rocks. This cube also provides a unique opportunity for imaging top- and intrabasalt structures. Detailed seismic geomorphological interpretation of the top-basalt horizon, locally calibrated with high-resolution P-Cable wide-azimuth data, reveals new insight into the late-stage development of the volcanic flow fields and the kilometer-high coastal Vøring Escarpment. Subaerial lava flows with compressional ridges and inflated lava lobes cover the marginal high, with a comparable structure and size to modern subaerial lava fields. Pitted surfaces, likely formed by lava emplaced in a wet environment, are present in the western part of the study area near the continent-ocean boundary. The prominent Vøring Escarpment formed when eastward-flowing lava reached the coastline. The escarpment morphology is influenced by preexisting structural highs, and these highs are locally bypassed by the lava. Volcanogenic debris flows are well-imaged on the escarpment horizon, along with large-scale large slump blocks. Similar features exist in active volcanic environments, e.g., on the south coast of Hawaii. Numerous postvolcanic extensional faults and incised channels cut into the marginal high and the escarpment, and we found that the area was geologically active after the volcanism ceased. In summary, igneous seismic geomorphology and seismic volcanostratigraphy are two very powerful methods to understand the volcanic deposits and development of rifted margins. Our study demonstrates great promise for further understanding the igneous development of offshore basins as more high-quality 3D seismic data become available. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/

• Senger, Kim; Millett, John; Planke, Sverre; Ogata, Kei; Eide, Christian Haug & Festøy, Marte Hergot [Show all 8 contributors for this article] (2017). Effects of igneous intrusions on the petroleum system: a review. First Break. ISSN 0263-5046. 35(6), p. 47–56. doi: 10.3997/1365-2397.2017011. Full text in Research Archive
• Corseri, Romain; Senger, Kim; Selway, Katherine; Abdelmalak, Mohamed Mansour; Planke, Sverre & Jerram, Dougal Alexander (2017). Magnetotelluric evidence for massive sulphide mineralization in intruded sediments of the outer Vøring Basin, mid-Norway. Tectonophysics. ISSN 0040-1951. doi: 10.1016/j.tecto.2017.04.011. Full text in Research Archive
• Schmiedel, Tobias; Kjoberg, Sigurd; Planke, Sverre; Magee, Craig; Galland, Olivier & Schofield, Nick [Show all 8 contributors for this article] (2017). Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin. Interpretation. ISSN 2324-8858. 5(3), p. SK23–SK38. doi: 10.1190/INT-2016-0155.1. Full text in Research Archive Show summary

  The emplacement of igneous intrusions into sedimentary basins mechanically deforms the host rocks and causes hydrocarbon maturation. Existing models of host-rock deformation are investigated using high-quality 3D seismic and industry well data in the western Møre Basin offshore mid-Norway. The models include synemplacement (e.g., elastic bending-related active uplift and volume reduction of metamorphic aureoles) and postemplacement (e.g., differential compaction) mechanisms. We use the seismic interpretations of five horizons in the Cretaceous-Paleogene sequence (Springar, Tang, and Tare Formations) to analyze the host rock deformation induced by the emplacement of the underlying saucer-shaped Tulipan sill. The results show that the sill, emplaced between 55.8 and 54.9 Ma, is responsible for the overlying dome structure observed in the seismic data. Isochron maps of the deformed sediments, as well as deformation of the younger postemplacement sediments, document a good match between the spatial distribution of the dome and the periphery of the sill. The thickness tt of the Tulipan is less than 100 m, whereas the amplitude ff of the overlying dome ranges between 30 and 70 m. Spectral decomposition maps highlight the distribution of fractures in the upper part of the dome. These fractures are observed in between hydrothermal vent complexes in the outer parts of the dome structure. The 3D seismic horizon interpretation and volume rendering visualization of the Tulipan sill reveal fingers and an overall saucer-shaped geometry. We conclude that a combination of different mechanisms of overburden deformation, including (1) elastic bending, (2) shear failure, and (3) differential compaction, is responsible for the synemplacement formation and the postemplacement modification of the observed dome structure in the Tulipan area.

• Grove, Clayton; Jerram, Dougal Alexander; Gluyas, Jon & Brown, Richard (2017). Sandstone Diagenesis in Sediment–lava Sequences: Exceptional Examples of Volcanically Driven Diagenetic Compartmentalization in Dune Valley, Huab Outliers, NW Namibia. Journal of Sedimentary Research. ISSN 1527-1404. 87(12), p. 1314–1335. doi: 10.2110/jsr.2017.75. Full text in Research Archive Show summary

  At the base of many flood basalt sequences and along volcanic rifted margins, volcanism can compete with the existing sedimentary environments, resulting in interbedded sequences of volcanic rocks and sediments. Here we report on sediment interlayers that are found in the lowermost volcanic units of the Etendeka flood basalts in NW Namibia (Twyfelfontein and Awahab formations), part of the much larger Paraná–Etendeka Igneous Province. The sandstone bodies, predominantly eolian dunes, are isolated in a sequence of Lower Cretaceous (∼ 134 Ma) lava flows. The uppermost part or where sediment deposition and lava emplacement is observed to interact is characterized by barchanoid dunes, which were actively migrating during the emplacement of the lava flows. The fossil (isolated by lava) barchan dunes studied in Dune Valley show three characteristically different diagenetic styles. In Dune Valley, each dune body is completely encapsulated by lava, with additional igneous intrusions cutting through some bodies. We recognize three distinct styles of diagenesis: Type 1: fossilised dunes that are red in color and lack major authigenic mineralization, with grain compaction and subsequent porosity loss being the dominant diagenetic process. Type 2: dunes that have been bleached white, which have undergone a more complex diagenetic pathway. Type 2 dunes have abundant calcite, kaolinite, and böhmite as authigenic phases and lack hematite grain coatings. Detrital plagioclase is absent in white dunes (XRD analysis), with pseudomorphs of kaolinite common. This diagenetic assemblage results in the white dunes having lower porosity and permeability compared to the red dunes. The observations are probably due to a flux of carbon dioxide (CO2), hydrogen sulfide (H2S) and/or hydrogen (H2)–rich hydrothermal groundwater derived from igneous intrusions below. Type 3: “hot contact” effects at lava-flow contacts, where the unconsolidated dunes were rapidly indurated during lava emplacement (volcano-eogenesis). Type 3 diagenesis is restricted to << 1 m depth below lava contacts and common in dunes displaying both Type 1 and Type 2 diagenesis. The distribution of diagenetic Types 1 and 2 is dune specific, and throughout Dune Valley approximately half of the dunes have been bleached (e.g., Type 2 diagenesis), whereas diagenetic Type 3 is a hot contact phenomenon and is therefore found along all basal lava and dike contacts. This work has relevance to understanding the development of sediment–lava systems, to hydrocarbon exploration and development in preserved sediment–lava sequences, and the hydrothermal process described provides an example of natural CO2 sequestration.

• Angkasa, Syahreza Saidina; Jerram, Dougal Alexander; Millett, John M; Svensen, Henrik; Planke, Sverre & Taylor, Ross A [Show all 8 contributors for this article] (2017). Mafic intrusions, hydrothermal venting and the basalt-sediment transition: Linking onshore and offshore examples from the north atlantic igneous province. Interpretation. ISSN 2324-8858. 5(3). doi: 10.1190/int-2016-0162.1. Full text in Research Archive Show summary

  The emplacement of large intrusive complexes into sedimentary basins can have profound effects on host sedimentary rocks including deformation, thermal aureole metamorphic reactions, alteration of fluid-flow pathways, and the formation of associated hydrothermal vent complexes (HVCs). These processes can in turn have major implications for petroleum systems on the local and regional scale, and can contribute to global climate change due to the production and outgassing of greenhouse gases, such as CH4 and CO2. Imaging these features and assessing their implications from seismic data beneath extrusive volcanic cover is challenging due to heterogeneities in the volcanic pile and at the basalt-sediment transition. We have evaluated combined field and laboratory petrophysical data from the Isle of Skye, Scotland, where we identify a seismic-scale example of extensive intrusions interacting with the base-basalt transition. We have also evaluated a unique onshore example of a linked sill and associated HVC cutting up through the lava sequence. We compare these field results with HVCs from reflection seismic data across the Vøring Marginal High, offshore Norway, where subbasalt saucer-shaped intrusions are also seen associated with HVCs cutting the lava sequence. Seismic imaging problems associated with the velocity heterogeneity of volcanic sequences, along with a historical lack of highquality 3D data in volcanic regions worldwide, is suggested as having largely precluded the identification of these features in the past. The under-representation of these hydrothermal vents in the literature has key implications for the future appraisal of intrusion-related outgassing effects on the global climate such as those related to the Palaeocene Eocene Thermal Maximum, along with subbasalt petroleum prospectivity where they may alter maturation and migration pathways. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/

• Reynolds, P.; Planke, Sverre; Millett, J.M.; Jerram, Dougal Alexander; Trulsvik, M. & Schofield, N. [Show all 7 contributors for this article] (2017). Hydrothermal vent complexes offshore Northeast Greenland: A potential role in driving the PETM. Earth and Planetary Science Letters. ISSN 0012-821X. 467, p. 72–78. doi: 10.1016/j.epsl.2017.03.031. Full text in Research Archive Show summary

  Continental rifting is often associated with voluminous magmatism and perturbations in the Earth's climate. In this study, we use 2D seismic data from the northeast Greenland margin to document two Paleogene-aged sill complexes ≥18 000 and ≥10 000 km2 in size. Intrusion of the sills resulted in the contact metamorphism of carbon-rich shales, producing thermogenic methane which was released via 52 newly discovered hydrothermal vent complexes, some of which reach up to 11 km in diameter. Mass balance calculations indicate that the volume of methane produced by these intrusive complexes is comparable to that required to have caused the negative δ13C isotope excursion associated with the PETM. Combined with data from the conjugate Norwegian margin, our study provides evidence for margin-scale, volcanically-induced greenhouse gas release during the late Paleocene/early Eocene. Given the abundance of similar-aged sill complexes in Upper Paleozoic–Mesozoic and Cretaceous–Tertiary basins elsewhere along the northeast Atlantic continental margin, our findings support a major role for volcanism in driving global climate change. Reynolds, P., et al. "Hydrothermal vent complexes offshore Northeast Greenland: A potential role in driving the PETM." Earth and Planetary Science Letters 467 (2017): 72-78. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.

• Jones, Morgan Thomas; Augland, Lars Eivind; Shephard, Grace; Burgess, Seth; Eliassen, Gauti Trygvason & Jochmann, Malte [Show all 10 contributors for this article] (2017). Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers. Scientific Reports. 7(1). doi: 10.1038/s41598-017-06170-7. Full text in Research Archive Show summary

  Radioisotopic dating of volcanic minerals is a powerful method for establishing absolute time constraints in sedimentary basins, which improves our understanding of the chronostratigraphy and evolution of basin processes. The relative plate motions of Greenland, North America, and Eurasia changed several times during the Palaeogene. However, the timing of a key part of this sequence, namely the initiation of compression between Greenland and Svalbard, is currently poorly constrained. The formation of the Central Basin in Spitsbergen is inherently linked to changes in regional plate motions, so an improved chronostratigraphy of the sedimentary sequence is warranted. Here we present U-Pb zircon dates from tephra layers close to the basal unconformity, which yield a weighted-mean 206Pb/238U age of 61.596 ± 0.028 Ma (2σ). We calculate that sustained sedimentation began at ~61.8 Ma in the eastern Central Basin based on a sediment accumulation rate of 71.6 ± 7.6 m/Myr. The timing of basin formation is broadly coeval with depositional changes at the Danian-Selandian boundary around the other margins of Greenland, including the North Sea, implying a common tectonic driving force. Furthermore, these stratigraphic tie points place age constraints on regional plate reorganization events, such as the onset of seafloor spreading in the Labrador Sea.

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• Jerram, Dougal Alexander & Caddick, Mark (2022). The Field Description of Metamorphic Rocks. Wiley-Blackwell. ISBN 9781118618752. doi: 10.1002/9781118618707. Full text in Research Archive Show summary

  This pocket-sized field guide describes how metamorphic rocks and rock masses may be observed, recorded and mapped in the field. Written at a level suitable for Earth Science undergraduate students, this book is an essential tool for any geologist — student, professional or amateur — faced with the task of making a general description of an area of metamorphic rocks. A clear, systematic framework, together with numerous colour diagrams, illustrations and checklists, enables readers with different backgrounds to produce useful descriptions, despite possible differences of background or specialist interest. Additional information is also provided to aid those who are undertaking field mapping courses or must compile field evidence into reports on the metamorphic evolution of a region. This book: Shows the reader how to observe metamorphic rocks in the field, from the outcrop to the hand specimen scale Is fully revised and updated to incorporate new developments in the field Offers a user-friendly and accessible writing style including a revised format with tabbed sections for easy navigation Covers key topics including classification and mapping of metamorphic rocks, understanding key textures and fabrics, and details on contacts and fault zones

• Jerram, Dougal Alexander (2019). Dig to the Centre of the Earth: An explorer's guide to the world beneath our feet. Carlton Kids. ISBN 9781783125098. 48 p. Full text in Research Archive
• Jerram, Dougal Alexander (2018). The Centre of the Earth: The Traveller's Guide. Palazzo Editions Ltd. ISBN 9781786750594. 160 p. Full text in Research Archive
• Jerram, Dougal Alexander; Scarth, Alwyn & Tanguy, Jean-Claude (2017). Volcanoes of Europe. Dunedin Academic Press. ISBN 9781780460420. 278 p. Full text in Research Archive

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• Lombardo, Ezequiel; Yagupsky, Daniel; Cristallini, Ernesto; Jerram, Dougal Alexander & Galland, Olivier (2025). Crustal doming induced by the emplacement of volcanic plumbing systems: case studies at back-arc volcanoes in the Neuquén Basin, Argentina. Full text in Research Archive Show summary

  Volcanic edifices in textbooks are typically represented as local accumulations of volcanic products generally building up from a near flat substratum. In this contribution, we present three volcanoes case studies and show that their substratum has been systematically uplifted through crustal doming. These case studies formed in the compressional back-arc tectonic setting of the Neuquén Basin, Argentina. These volcanic complexes built upon, and their shallow plumbing systems were emplaced into, the Mesozoic sedimentary strata of the Neuquén Basin. Borehole data and 3-dimensional seismic data acquired for hydrocarbon exploration show that the strata of the Mesozoic substratum underneath each volcanic complex exhibits a large, gentle domal structure of 500 to 1000 metres amplitude. The domal structures correlate in position and dimension with those of the volcanoes, which consist of a thin cover of volcanic products coating the underlying crustal dome. The volcanoes also show evidence of lower amplitude localized doming around individual and nested shallow intrusions. Our study suggests that the injection of volcanic plumbing systems in back-arc settings contributes to crustal thickening and doming of the Earth's surface. Such doming may locally affect regional stresses, which may impact magma transport in the shallow crust and control the emplacement of radial dyke swarms, shallower sill intrusions, and enhance transport of magma to the surface. In general, our study highlights the effects of volcanic plumbing systems on the structure and stress in the Earth's crust, and the links from the deeper to the shallower parts of the system.

• Galland, Olivier & Jerram, Dougal Alexander (2024). Structural control of igneous intrusions on fluid migration in sedimentary basins. [Internet]. YouTube. doi: https:/youtu.be/AnRo85chr5Q. Full text in Research Archive Show summary

  This video is a brief summary of two publications describing the control of ancient magmatic intrusions on subsurface fluid migrations, here bitumen. The publications are: - Galland, O., Villar, H.J. et al. 2023. The long-term legacy of subvolcanic intrusions on fluid migration in sedimentary basins: The Cerro Alquitrán case study, northern Neuquén Basin, Argentina. Basin Research, 35, 1840-1855, https://doi.org/https://doi.org/10.1111/bre.12782. - Galland, O., Villar, H. et al. 2024. Structural control of igneous intrusions on fluid migration in sedimentary basins: the case study of large bitumen seeps at Cerro Alquitrán and Cerro La Paloma, northern Neuquén Basin, Argentina. In: Kilhams, B., Watson, D. and Holford, S. (eds) The Impacts of Igneous Systems on Sedimentary Basins and Their Energy Resources. Geological Society, London, Special Publications, https://doi.org/https://doi.org/10.1144/SP547-2023-115. The study shows that intense fracturing within the magmatic body, induced by the shearing of the magma during emplacement, represent high-permeability zones that channel subsurface fluid migrations. Our study highlights the high relevance of accounting for fractured subsurface magmatic intrusions in basin models, but also on geothermal energy exploration.

• Whattam, Jack; Svensen, Henrik Hovland; Midtkandal, Ivar; Jerram, Dougal Alexander & Callegaro, Sara (2024). Mafic volcaniclastic deposits in the Oslo Rift. Full text in Research Archive
• Augland, Lars Eivind; Lundmark, Anders Mattias; Callegaro, Sara & Jerram, Dougal Alexander (2023). Rapid translithospheric ascent rates for Lamprophyres from zircon dissolution speedometry. Full text in Research Archive
• Callegaro, Sara; Svensen, Henrik Hovland; Heimdal, Thea Hatlen; Guarino, Vincenza; Deegan, Frances M. & Jerram, Dougal Alexander [Show all 8 contributors for this article] (2023). Dolerite sills from the Siberian Traps (Tunguska basin, Russia) bear evidence of halogens mobilization from evaporitic host rocks. Full text in Research Archive
• Callegaro, Sara; Svensen, Henrik Hovland; Heimdal, Thea Hatlen; Deegan, Frances M.; Jerram, Dougal Alexander & Polozov, Alexander [Show all 7 contributors for this article] (2023). Magma-evaporite interaction in doleritic sills from the Siberian Traps: insights from whole-rock and mineral data. Full text in Research Archive
• Planke, Sverre; Millett, John M.; Manton, Ben M.; Jerram, Dougal Alexander; Rossetti, Lucas & Myklebust, Reidun (2023). Exploring Brazilian Volcanic Basins for Hydrocarbons and Permanent Carbon Storage. Full text in Research Archive
• Whattam, Jack; Svensen, Henrik Hovland; Midtkandal, Ivar; Callegaro, Sara & Jerram, Dougal Alexander (2023). Intermittent cessation and renewal of volcanism in the Oslo Rift revealed through detailed mapping and stratigraphy. Full text in Research Archive
• Augland, Lars Eivind; Lundmark, Anders Mattias; Rian, Maiken Thorvaldsen & Jerram, Dougal Alexander (2022). Non-dissolved mantle zircons record hyper rapid translithospheric ascent of lamprophyres. Full text in Research Archive
• Jerram, Dougal Alexander (2022). Understanding the South Atlantic Volcanic Margin: Key Insights from Subaerial to Subaqueous Volcanic / Sedimentary Environments Onshore Namibia and Angola. Full text in Research Archive
• Jerram, Dougal Alexander (2022). Understanding large igneous provinces and volcanic rift margins. Full text in Research Archive
• Jerram, Dougal Alexander; Planke, Sverre; Millett, JM & Howell, John (2022). Understanding volcanic margin prospectivity; insights from the north and south Atlantic margins. Full text in Research Archive
• Manton, Ben; Müller, Philipp; Mazzini, Adriano; Zastrozhnov, Dmitry; Jerram, Dougal Alexander & Millett, John M. [Show all 10 contributors for this article] (2022). Corrigendum to “Characterizing ancient and modern hydrothermal venting systems” [Marine Geology 447 (2022) 106781] (Marine Geology (2022) 447, (S0025322722000524), (10.1016/j.margeo.2022.106781)). Marine Geology. ISSN 0025-3227. 453. doi: 10.1016/j.margeo.2022.106913. Full text in Research Archive
• Stokke, Ella Wulfsberg; Liu, Emma J.; Longman, Jack; Jerram, Dougal Alexander; Millett, John M & Jones, Morgan Thomas (2021). Evidence of unusually explosive hydromagmatic eruptions and their role in the emplacement of the North Atlantic Igneous Province. Full text in Research Archive
• Callegaro, Sara; Svensen, Henrik Hovland; Jerram, Dougal Alexander; Neumann, Else Ragnhild; Deegan, Frances M. & Polozov, Alexander [Show all 7 contributors for this article] (2021). Geochemistry of low-Ti Siberian Traps sills from the Tunguska Basin bears evidence of magma-crust interaction. Full text in Research Archive
• Planke, Sverre; Polozov, Alexander; Millett, John M & Jerram, Dougal Alexander (2020). The Siberian Traps magma emplacement dynamics links to environmental changes across the Permian-Triassic boundary in Svalbard. EGU General Assembly Conference Abstracts. p. 21766–21766. Full text in Research Archive
• Manton, Ben; Millett, John M; Walker, Faye & Jerram, Dougal Alexander (2020). Inter-Basalt Prospectivity at Elongated Ridges in the NE Atlantic. EAGE Conference and Exhibition. doi: 10.3997/2214-4609.202011906. Full text in Research Archive
• Millett, John M; Jerram, Dougal Alexander & Planke, Sverre (2020). The Petrophysical Properties of Lava Flow Reservoirs. EAGE Conference and Exhibition. doi: 10.3997/2214-4609.202012052. Full text in Research Archive
• Avseth, Per Åge; Millett, John M; Jerram, Dougal Alexander; Planke, Sverre & Healy, Dave (2020). Rock Physics Analysis of Volcanic Lava Flows and Hyaloclastites. EAGE Conference and Exhibition. doi: 10.3997/2214-4609.202010499. Full text in Research Archive
• Jerram, Dougal Alexander; Sharp, Ian; Poulsen, Ragnar; Millett, John M; Planke, Sverre & Watton, Timothy J. [Show all 7 contributors for this article] (2020). Understanding the transitions from sub-aqueous to subaerial volcanic environments; inferences from exceptional exposures along the coast of Angola. NGF abstracts and proceedings. Full text in Research Archive
• Torsvik, Trond Helge; Svensen, Henrik; Steinberger, Bernhard; Royer, Dana L.; Jerram, Dougal Alexander & Jones, Morgan Thomas [Show all 7 contributors for this article] (2020). Connecting the Deep Earth and the Atmosphere. Full text in Research Archive
• Planke, Sverre; Polozov, Alexander; Millett, John M; Jerram, Dougal Alexander; Zastrozhnov, Dmitrii & Svensen, Henrik (2020). Emergent and invasive magmatism of the Siberian Traps in a wet forest environment. NGF abstracts and proceedings. Full text in Research Archive
• Millett, John M; Planke, Sverre; Jerram, Dougal Alexander; Hole, M.; Famelli, N & Jolley, D.W. (2020). Magmatism in wet sediment environ-ments: processes, deposits and implic-ations for prospective volcanic rifted margins. NGF abstracts and proceedings. Full text in Research Archive
• Manton, Ben; Walker, Faye; Millett, John M; Zastrozhnov, Dmitrii; Polteau, Stephane & Jerram, Dougal Alexander [Show all 8 contributors for this article] (2020). The identification of inter-volcanic exploration targets in the NE Atlantic. NGF abstracts and proceedings. Full text in Research Archive
• Mattsson, Tobias; Burchardt, Steffi; Palma, Octavio; Galland, Olivier; Almqvist, Bjarne S.G. & Hammer, Øyvind [Show all 9 contributors for this article] (2019). Magmatic fabrics related to different growth stages of the Cerro Bayo Cryptodome. Full text in Research Archive
• Planke, Sverre; Millett, John; Jerram, Dougal Alexander; Zastrozhnov, Dmitrii; Maharjan, Dwarika & Manton, Ben [Show all 9 contributors for this article] (2019). Igneous seismic geomorphology of Paleogene basalts in the West of Shetland, Møre, and Vøring basins. NGF Abstracts and Proceedings of the Geological Society of Norway. Full text in Research Archive
• Polozov, Alexander; Planke, Sverre; Millett, John; Svensen, Henrik & Jerram, Dougal Alexander (2019). Hybrid rocks formation at onset of the Siberian Traps basalt lavas eruption and shallow intrusions emplacement. Full text in Research Archive
• Svensen, Henrik; Jerram, Dougal Alexander; Polozov, Alexander; Jones, Morgan Thomas; Augland, Lars Eivind & Planke, Sverre (2018). Volcanic causes for the PETM and other past hothouse climates. Full text in Research Archive
• Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Millett, John M; Jones, Morgan Thomas & Augland, Lars Eivind [Show all 7 contributors for this article] (2018). Types and styles of volcanism in the North Atlantic Igneous Province: Implications towards understanding their potential climatic impact. Full text in Research Archive
• Jerram, Dougal Alexander (2018). BBC World News/BBC News 24; interview about Hawaii Volcanic event. [TV]. BBC Offices, Birmingham UK. Full text in Research Archive
• Schmiedel, Tobias; Kjoberg, Sigurd; Planke, Sverre; Magee, Craig; Galland, Olivier & Schofield, Nick [Show all 8 contributors for this article] (2017). Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin. Full text in Research Archive
• Schmiedel, Tobias; Kjoberg, Sigurd; Planke, Sverre; Magee, Craig; Galland, Olivier & Schofield, Nick [Show all 8 contributors for this article] (2017). Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin. Full text in Research Archive
• Millett, J.M.; Haskins, Eric; Thomas, Donald; Jerram, Dougal Alexander; Planke, Sverre & Healy, D [Show all 10 contributors for this article] (2017). Porosity and permeability evolution of vesicular basalt reservoirs with increasing depth: constraints from the Big Island of Hawai'i. Full text in Research Archive
• Jerram, Dougal Alexander (2017). Volcano expert explains why Mount Etna blast happened. CBBC Newsround Interview. [TV]. http://www.bbc.co.uk/newsround/39302289. Full text in Research Archive
• Pierdominici, Simona; Kueck, Jochem; Millett, J.M.; Planke, Sverre; Jerram, Dougal Alexander & Haskins, Eric [Show all 7 contributors for this article] (2017). Present-day stress state analysis on the Big Island of Hawaíi, USA. Full text in Research Archive
• Planke, Sverre; Millett, John M; Maharjan, Dwarika; Jerram, Dougal Alexander & Abdelmalak, Mohamed Mansour (2017). 3D seismic imaging of voluminous earliest Eocene buried lava fields and coastal escarpments off mid-Norway. Full text in Research Archive
• Polozov, Alexander; Planke, Sverre; Svensen, Henrik; Jerram, Dougal Alexander & Looy, Cindy (2017). Burned and buried by the Siberian traps: tree trunks in volcaniclastics and lavas. Full text in Research Archive
• Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Millett, John M & Reynolds, Pete (2017). Sill induced hydrothermal venting: A summary of our current understanding. Full text in Research Archive
• Burchardt, Steffi; Palma, Octavio; Galland, Olivier; Mair, Karen & Jerram, Dougal Alexander (2017). Syn-emplacement deformation of the Cerro Bayo laccolith, Argentina. Full text in Research Archive
• Eide, Christian Haug; Schofield, Nick; Jerram, Dougal Alexander & Howell, John Anthony (2017). Basin-scale architecture of deeply emplaced sill complexes. Full text in Research Archive
• Jones, Morgan Thomas; Augland, Lars Eivind; Shephard, Grace; Burgess, Seth; Eliassen, Gauti & Jerram, Dougal Alexander [Show all 10 contributors for this article] (2017). Bentonite layers in Svalbard: constraining sources of volcanism, geochronology, and relative plate motions during the Paleogene. Full text in Research Archive

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