Dougal Alexander Jerram

• Galland, Olivier; Villar, Héctor J.; Mescua, José; Jerram, Dougal Alexander; Midtkandal, Ivar & Palma, J. Octavio [Vis alle 8 forfattere av denne artikkelen] (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), s. 1840–1855. doi: 10.1111/bre.12782. Fulltekst i vitenarkiv
• Marins, Gabriel M.; Parizek-Silva, Yaro; Millett, John M.; Jerram, Dougal Alexander; Rossetti, Lucas M.M. & de Jesus e Souza, Ariany [Vis alle 9 forfattere av denne artikkelen] (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.
• Manton, Ben; Müller, Philipp; Mazzini, Adriano; Zastrozhnov, Dmitry; Jerram, Dougal Alexander & Millett, John M. [Vis alle 10 forfattere av denne artikkelen] (2022). Characterizing ancient and modern hydrothermal venting systems. Marine Geology. ISSN 0025-3227. 447. doi: 10.1016/j.margeo.2022.106781.
• Millett, John M.; Jerram, Dougal Alexander; Planke, Sverre; Mund, Bineet K.; Konar, Shubhodip & Sharda, Ruchika [Vis alle 8 forfattere av denne artikkelen] (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), s. 3348–3377. doi: 10.1111/bre.12605.
• Torsvik, Trond Helge; Svensen, Henrik; Steinberger, Bernhard; Royer, Dana L.; Jerram, Dougal Alexander & Jones, Morgan Thomas [Vis alle 7 forfattere av denne artikkelen] (2021). Connecting the Deep Earth and the Atmosphere. Geophysical Monograph Series. ISSN 0065-8448. 263, s. 413–453. doi: 10.1002/9781119528609.ch16.
• 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. Fulltekst i vitenarkiv
• Callegaro, Sara; Svensen, Henrik Hovland; Neumann, Else Ragnhild; Polozov, Alexander G.; Jerram, Dougal Alexander & Deegan, Frances M. [Vis alle 10 forfattere av denne artikkelen] (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. Fulltekst i vitenarkiv
• Millett, John M.; Jerram, Dougal Alexander; Manton, Ben; Planke, Sverre; Ablard, Peter & Wallis, Dirk [Vis alle 10 forfattere av denne artikkelen] (2021). The Rosebank Field, NE Atlantic: Volcanic characterisation of an inter-lava hydrocarbon discovery. Basin Research. ISSN 0950-091X. 33(6), s. 2883–2913. doi: 10.1111/bre.12585.
• Famelli, Natália; Millett, John; Hole, Malcolm; Lima, Evandro F.; Carmo, Isabela de O. & Jerram, Dougal Alexander [Vis alle 9 forfattere av denne artikkelen] (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.
• 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.
• Millett, John M.; Manton, Ben M.; Zastrozhnov, Dmitrii; Planke, Sverre; Maharjan, Dwarika & Bellwald, Benjamin [Vis alle 16 forfattere av denne artikkelen] (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, s. 99–138. doi: 10.1144/SP495-2019-12.
• Walker, Faye; Schofield, Nick; Millett, John; Jolley, Dave; Holford, Simon & Planke, Sverre [Vis alle 8 forfattere av denne artikkelen] (2020). Inside the volcano: Three-dimensional magmatic architecture of a buried shield volcano. Geology. ISSN 0091-7613. doi: 10.1130/G47941.1. Fulltekst i vitenarkiv
• Svensen, Henrik; Hammer, Øyvind; Chevallier, Luc; Jerram, Dougal Alexander; Silkoset, Petter & Polteau, Stephane [Vis alle 7 forfattere av denne artikkelen] (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. I Adatte, Thierry; Bond, David P.G. & Keller, Gerta (Red.), Mass extinctions, volcanism, and impacts. The Geological Society of America. ISSN 9780813725444. s. 67–84.
• Pierdominici, Simona; Millet, John M.; Kück, Jochem K. M.; Thomas, Donald; Jerram, Dougal Alexander & Planke, Sverre [Vis alle 9 forfattere av denne artikkelen] (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. Fulltekst i vitenarkiv
• 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), s. 235–267. doi: 10.11648/j.earth.20190805.11.
• Greenfield, L.; Millett, John M; Howell, J.A.; Jerram, Dougal Alexander; Watton, Timothy J. & Healy, D [Vis alle 8 forfattere av denne artikkelen] (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), s. 1081–1104. doi: 10.1111/bre.12415.
• 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), s. 445–466. doi: 10.1111/phor.12301. Fulltekst i vitenarkiv
• Burchardt, Steffi; Mattsson, Tobias; Palma, J Octavio; Galland, Olivier; Almqvist, Bjarne & Mair, Karen [Vis alle 9 forfattere av denne artikkelen] (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), s. 7934–7961. doi: 10.1029/2019JB017543.
• Augland, Lars Eivind; Ryabov, Viktor V.; Vernikovsky, Valery A.; Planke, Sverre; Polozov, Alexander & Callegaro, Sara [Vis alle 8 forfattere av denne artikkelen] (2019). The main pulse of the Siberian Traps expanded in size and composition. Scientific Reports. ISSN 2045-2322. 9. doi: 10.1038/s41598-019-54023-2. Fulltekst i vitenarkiv Vis sammendrag

  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.

• Berndt, Christian; Planke, Sverre; Teagle, Damon; Huismans, Ritske; Torsvik, Trond Helge & Frieling, Joost [Vis alle 12 forfattere av denne artikkelen] (2019). Northeast Atlantic breakup volcanism and consequences for Paleogene climate change – MagellanPlus Workshop report. Scientific Drilling. ISSN 1816-8957. 26, s. 69–85. doi: 10.5194/sd-26-69-2019. Fulltekst i vitenarkiv Vis sammendrag

  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.

• Rossetti, Lucas; Healy, David; Hole, Malcolm J; Millett, John M; de Lima, Evandro F & Jerram, Dougal Alexander [Vis alle 7 forfattere av denne artikkelen] (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, s. 638–656. doi: 10.1016/j.marpetgeo.2019.01.028.
• Jerram, Dougal Alexander; Millett, John M; Kück, Jochem; Thomas, Donald; Planke, Sverre & Haskins, Eric [Vis alle 8 forfattere av denne artikkelen] (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, s. 15–33. doi: 10.5194/sd-25-15-2019. Fulltekst i vitenarkiv
• Svensen, Henrik; Jerram, Dougal Alexander; Polozov, Alexander; Planke, Sverre; Neal, Clive R. & Augland, Lars Eivind [Vis alle 7 forfattere av denne artikkelen] (2019). Thinking about LIPs: A brief history of ideas in Large igneous province research. Tectonophysics. ISSN 0040-1951. 760, s. 229–251. doi: 10.1016/j.tecto.2018.12.008. Fulltekst i vitenarkiv
• Jerram, Dougal Alexander; Sharp, Ian; Torsvik, Trond Helge; Poulsen, Ragnar; Watton, Timothy J. & Freitag, Ulrike [Vis alle 15 forfattere av denne artikkelen] (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.
• Millett, J.M.; Planke, Sverre; Kastner, Felix; Blischke, A; Hersir, Gylfi Pall & Halldorsdottir, Sæunn [Vis alle 17 forfattere av denne artikkelen] (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.
• Planke, Sverre; Rabbel, Ole; Galland, Olivier; Millet, John; Manson, Ben & Jerram, Dougal Alexander [Vis alle 8 forfattere av denne artikkelen] (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. I Vernengo, Luis; Atencio, Mario; Branca, Marcela; Corti, Eduardo; D'Biassi, Tomás; Dario Enrique, Jorge; García Torrejón, Maximiliano; Pianelli, Luis; Ricardi, Alberto; Soubiés, Daniel & Späth, Federico (Red.), 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 978-987-9139-92-9. s. 343–366.
• Svensen, Henrik; Frolov, Sergei; G., Akhmanov; Polozov, Alexander; Jerram, Dougal Alexander & Shiganova, O. [Vis alle 9 forfattere av denne artikkelen] (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.
• Polteau, Stephane; Mazzini, Adriano; Hansen, Geir; Planke, Sverre; Jerram, Dougal Alexander & Millett, John [Vis alle 9 forfattere av denne artikkelen] (2018). The pre-breakup stratigraphy and petroleum system of the Southern Jan Mayen Ridge revealed by seafloor sampling. Tectonophysics. ISSN 0040-1951. 760, s. 152–164. doi: 10.1016/j.tecto.2018.04.016. Vis sammendrag

  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.

• Abdelmalak, Mohamed Mansour; Planke, Sverre; Polteau, Stephane; Hartz, Ebbe Hvidegård; Faleide, Jan Inge & Tegner, Christian [Vis alle 9 forfattere av denne artikkelen] (2018). Breakup volcanism and plate tectonics in the NW Atlantic. Tectonophysics. ISSN 0040-1951. 760, s. 267–296. doi: 10.1016/j.tecto.2018.08.002.
• van Wyk de Vries, Ben; Byrne, Paul; Delcamp, Audray; Einarson, Pall; Göğüş, Oğuz & Guilbaud, Marie-Noelle [Vis alle 17 forfattere av denne artikkelen] (2018). A global framework for the Earth: Putting geological sciences in context. Global and Planetary Change. ISSN 0921-8181. 171, s. 293–321. doi: 10.1016/j.gloplacha.2017.12.019. Vis sammendrag

  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.

• Svensen, Henrik; Torsvik, Trond Helge; Callegaro, Sara; Augland, Lars Eivind; Heimdal, Thea Hatlen & Jerram, Dougal Alexander [Vis alle 8 forfattere av denne artikkelen] (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, s. 17–40. doi: 10.1144/SP463.7.
• 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.
• 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), s. 1314–1335. doi: 10.2110/jsr.2017.75. Vis sammendrag

  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.

• Planke, Sverre; Millett, John M; Maharjan, Dwarika; Jerram, Dougal Alexander; Abdelmalak, Mohamed Mansour & Groth, Audun [Vis alle 9 forfattere av denne artikkelen] (2017). Igneous seismic geomorphology of buried lava fields and coastal escarpments on the Vøring volcanic rifted margin. Interpretation. ISSN 2324-8858. 5(3), s. SK161–SK177. doi: 10.1190/INT-2016-0164.1. Fulltekst i vitenarkiv
• Reynolds, P.; Planke, Sverre; Millett, J.M.; Jerram, Dougal Alexander; Trulsvik, M. & Schofield, N. [Vis alle 7 forfattere av denne artikkelen] (2017). Hydrothermal vent complexes offshore Northeast Greenland: A potential role in driving the PETM. Earth and Planetary Science Letters. ISSN 0012-821X. 467, s. 72–78. doi: 10.1016/j.epsl.2017.03.031. Fulltekst i vitenarkiv
• Angkasa, Syahreza Saidina; Jerram, Dougal Alexander; Millett, John M; Svensen, Henrik; Planke, Sverre & Taylor, Ross A [Vis alle 8 forfattere av denne artikkelen] (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. Fulltekst i vitenarkiv
• Schmiedel, Tobias; Kjoberg, Sigurd; Planke, Sverre; Magee, Craig; Galland, Olivier & Schofield, Nick [Vis alle 8 forfattere av denne artikkelen] (2017). Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin. Interpretation. ISSN 2324-8858. 5(3), s. SK23–SK38. doi: 10.1190/INT-2016-0155.1. Fulltekst i vitenarkiv Vis sammendrag

  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.

• Jones, Morgan Thomas; Augland, Lars Eivind; Shephard, Grace; Burgess, Seth; Eliassen, Gauti Trygvason & Jochmann, Malte [Vis alle 10 forfattere av denne artikkelen] (2017). Constraining shifts in North Atlantic plate motions during the Palaeocene by U-Pb dating of Svalbard tephra layers. Scientific Reports. ISSN 2045-2322. 7(1). doi: 10.1038/s41598-017-06170-7. Fulltekst i vitenarkiv
• 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, s. 196–205. doi: 10.1016/j.tecto.2017.04.011. Fulltekst i vitenarkiv
• 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), s. SK103–SK120. doi: 10.1190/int-2016-0143.1. Fulltekst i vitenarkiv
• Senger, Kim; Millett, John; Planke, Sverre; Ogata, Kei; Eide, Christian Haug & Festøy, Marte Hergot [Vis alle 8 forfattere av denne artikkelen] (2017). Effects of igneous intrusions on the petroleum system: a review. First Break. ISSN 0263-5046. 35(6), s. 47–56. doi: 10.3997/1365-2397.2017011.
• Kjoberg, Sigurd; Schmiedel, Tobias; Planke, Sverre; Svensen, Henrik; Millett, John & Jerram, Dougal Alexander [Vis alle 11 forfattere av denne artikkelen] (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), s. SK65–SK81. doi: 10.1190/int-2016-0159.1. Fulltekst i vitenarkiv Vis sammendrag

  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.

• Jones, Morgan Thomas; Trygvason Eliassen, Gauti; Shephard, Grace; Svensen, Henrik; Jochmann, Malte & Friis, Bjarki [Vis alle 9 forfattere av denne artikkelen] (2016). Provenance of bentonite layers in the Palaeocene strata of the Central Basin, Svalbard: implications for magmatism and rifting events around the onset of the North Atlantic Igneous Province. Journal of Volcanology and Geothermal Research. ISSN 0377-0273. 327, s. 571–584. doi: 10.1016/j.jvolgeores.2016.09.014.
• Millett, JM; Wilkins, AD; Campbell, E; Hole, MJ; Taylor, RA & Healy, D [Vis alle 11 forfattere av denne artikkelen] (2016). The geology of offshore drilling through basalt sequences: Understanding operational complications to improve efficiency. Marine and Petroleum Geology. ISSN 0264-8172. 77, s. 1177–1192. doi: 10.1016/j.marpetgeo.2016.08.010.
• Abdelmalak, Mohamed Mansour; Planke, Sverre; Faleide, Jan Inge; Jerram, Dougal Alexander; Zastrozhnov, Dmitrii & Eide, Sigurd [Vis alle 7 forfattere av denne artikkelen] (2016). The development of volcanic sequences at rifted margins: New insights from the structure and morphology of the Vøring Escarpment, mid-Norwegian Margin. Journal of Geophysical Research (JGR): Solid Earth. ISSN 2169-9313. 121(7), s. 5212–5236. doi: 10.1002/2015JB012788.
• Eide, Christian Haug; Schofield, Nick; Jerram, Dougal Alexander & Howell, John Anthony (2016). Basin-scale architecture of deeply emplaced sill complexes: Jameson Land, East Greenland Christian. Journal of the Geological Society. ISSN 0016-7649. 174(1), s. 23–40. doi: 10.1144/jgs2016-018. Fulltekst i vitenarkiv
• Jerram, Dougal Alexander; Widdowson, Mike; Wignall, Paul B.; Sun, Yadong; Lai, Xulong & Bond, David P.G. [Vis alle 7 forfattere av denne artikkelen] (2016). Submarine palaeoenvironments during Emeishan flood basalt volcanism, SW China: Implications for plume-lithosphere interaction during the Capitanian, Middle Permian ('end Guadalupian') extinction event. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 441, s. 65–73. doi: 10.1016/j.palaeo.2015.06.009.
• Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Polozov, Alexander G. & Torsvik, Trond Helge (2015). The onset of flood volcanism in the north-western part of the Siberian Traps: Explosive volcanism versus effusive lava flows. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 441(1), s. 38–50. doi: 10.1016/j.palaeo.2015.04.022.
• Polozov, Alexander G.; Svensen, Henrik; Planke, Sverre; Grishina, S.N.; Fristad, Kirsten & Jerram, Dougal Alexander (2015). The basalt pipes of the Tunguska Basin (Siberia, Russia): High temperature processes and volatile degassing to the end-Permian atmosphere. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 441(1), s. 51–64. doi: 10.1016/j.palaeo.2015.06.035.
• Jones, Morgan Thomas; Jerram, Dougal Alexander; Svensen, Henrik & Grove, Clayton (2015). The effects of large igneous provinces on the global carbon and sulphur cycles. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 441, s. 4–21. doi: 10.1016/j.palaeo.2015.06.042.
• Nelson, Catherine E.; Jerram, Dougal Alexander; Clayburn, John A.P.; Halton, Alison M. & Roberge, Julie (2015). Eocene volcanism in offshore southern Baffin Bay. Marine and Petroleum Geology. ISSN 0264-8172. 67, s. 678–691. doi: 10.1016/j.marpetgeo.2015.06.002.
• Watton, Tim J.; Wright, Kirstie A.; Jerram, Dougal Alexander & Brown, Rickhard J. (2014). The petrophysical and petrographical properties of hyaloclastite deposits: Implications for petroleum exploration. American Association of Petroleum Geologists Bulletin. ISSN 0149-1423. 98(3), s. 449–463. doi: 10.1306/08141313029.

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• Jerram, Dougal Alexander & Caddick, Mark (2022). The Field Description of Metamorphic Rocks. Wiley-Blackwell. ISBN 9781118618752. Vis sammendrag

  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 978-1783125098. 48 s.
• Jerram, Dougal Alexander (2018). The Centre of the Earth: The Traveller's Guide . Palazzo Editions Ltd. ISBN 978-1786750594. 160 s.
• Jerram, Dougal Alexander; Scarth, Alwyn & Tanguy, Jean-Claude (2017). Volcanoes of Europe. Dunedin Academic Press. ISBN 9781780460420. 278 s.

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• 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.
• Jerram, Dougal Alexander; Planke, Sverre; Millett, JM & Howell, John (2022). Understanding volcanic margin prospectivity; insights from the north and south Atlantic margins.
• Jerram, Dougal Alexander (2022). Understanding large igneous provinces and volcanic rift margins.
• Jerram, Dougal Alexander (2022). Understanding the South Atlantic Volcanic Margin: Key Insights from Subaerial to Subaqueous Volcanic / Sedimentary Environments Onshore Namibia and Angola.
• Manton, Ben; Müller, Philipp; Mazzini, Adriano; Zastrozhnov, Dmitry; Jerram, Dougal Alexander & Millett, John M. [Vis alle 10 forfattere av denne artikkelen] (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.
• Augland, Lars Eivind; Lundmark, Anders Mattias; Rian, Maiken Thorvaldsen & Jerram, Dougal Alexander (2022). Non-dissolved mantle zircons record hyper rapid translithospheric ascent of lamprophyres.
• 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.
• Callegaro, Sara; Svensen, Henrik Hovland; Jerram, Dougal Alexander; Neumann, Else Ragnhild; Deegan, Frances M. & Polozov, Alexander [Vis alle 7 forfattere av denne artikkelen] (2021). Geochemistry of low-Ti Siberian Traps sills from the Tunguska Basin bears evidence of magma-crust interaction.
• 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.
• 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.
• Manton, Ben; Walker, Faye; Millett, John M; Zastrozhnov, Dmitrii; Polteau, Stephane & Jerram, Dougal Alexander [Vis alle 8 forfattere av denne artikkelen] (2020). The identification of inter-volcanic exploration targets in the NE Atlantic. NGF abstracts and proceedings.
• Jerram, Dougal Alexander; Sharp, Ian; Poulsen, Ragnar; Millett, John M; Planke, Sverre & Watton, Timothy J. [Vis alle 7 forfattere av denne artikkelen] (2020). Understanding the transitions from sub-aqueous to subaerial volcanic environments; inferences from exceptional exposures along the coast of Angola. NGF abstracts and proceedings.
• 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. s. 21766–21766.
• 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.
• 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.
• 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.
• Torsvik, Trond Helge; Svensen, Henrik; Steinberger, Bernhard; Royer, Dana L.; Jerram, Dougal Alexander & Jones, Morgan Thomas [Vis alle 7 forfattere av denne artikkelen] (2020). Connecting the Deep Earth and the Atmosphere.
• Mattsson, Tobias; Burchardt, Steffi; Palma, Octavio; Galland, Olivier; Almqvist, Bjarne S.G. & Hammer, Øyvind [Vis alle 9 forfattere av denne artikkelen] (2019). Magmatic fabrics related to different growth stages of the Cerro Bayo Cryptodome.
• Andersen, Torgeir Bjørge; Gaina, Carmen & Jerram, Dougal Alexander (2019). The Caledonian Wilson Cycle. [TV]. Movie project for YouTube, teaching and outreach. Vis sammendrag

  A film project on the The Wilson Cycle and Circum-Arctic tectonics illustrated by the Geology of the Caledonian mountain belt in southern Scandinavia.

• Planke, Sverre; Millett, John; Jerram, Dougal Alexander; Zastrozhnov, Dmitrii; Maharjan, Dwarika & Manton, Ben [Vis alle 9 forfattere av denne artikkelen] (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.
• 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.
• 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.
• Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Millett, John M; Jones, Morgan Thomas & Augland, Lars Eivind [Vis alle 7 forfattere av denne artikkelen] (2018). Types and styles of volcanism in the North Atlantic Igneous Province: Implications towards understanding their potential climatic impact.
• Jerram, Dougal Alexander (2018). BBC World News/BBC News 24; interview about Hawaii Volcanic event. [TV]. BBC Offices, Birmingham UK.
• Jerram, Dougal Alexander (2017). Volcano expert explains why Mount Etna blast happened. CBBC Newsround Interview. [TV]. http://www.bbc.co.uk/newsround/39302289.
• Millett, J.M.; Haskins, Eric; Thomas, Donald; Jerram, Dougal Alexander; Planke, Sverre & Healy, D [Vis alle 10 forfattere av denne artikkelen] (2017). Porosity and permeability evolution of vesicular basalt reservoirs with increasing depth: constraints from the Big Island of Hawai'i.
• Pierdominici, Simona; Kueck, Jochem; Millett, J.M.; Planke, Sverre; Jerram, Dougal Alexander & Haskins, Eric [Vis alle 7 forfattere av denne artikkelen] (2017). Present-day stress state analysis on the Big Island of Hawaíi, USA.
• 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.
• 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.
• Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Millett, John M & Reynolds, Pete (2017). Sill induced hydrothermal venting: A summary of our current understanding.
• Burchardt, Steffi; Palma, Octavio; Galland, Olivier; Mair, Karen & Jerram, Dougal Alexander (2017). Syn-emplacement deformation of the Cerro Bayo laccolith, Argentina.
• Schmiedel, Tobias; Kjoberg, Sigurd; Planke, Sverre; Magee, Craig; Galland, Olivier & Schofield, Nick [Vis alle 8 forfattere av denne artikkelen] (2017). Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin.
• Schmiedel, Tobias; Kjoberg, Sigurd; Planke, Sverre; Magee, Craig; Galland, Olivier & Schofield, Nick [Vis alle 8 forfattere av denne artikkelen] (2017). Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin.
• Planke, Sverre; Millett, John; Jerram, Dougal Alexander; Senger, Kim; Galland, Olivier & Schmid, Daniel Walter [Vis alle 7 forfattere av denne artikkelen] (2017). Petroleum exploration in volcanic basins: An overview of the impact of igneous processes and deposits.
• Jones, Morgan Thomas; Augland, Lars Eivind; Shephard, Grace; Burgess, Seth; Eliassen, Gauti & Jerram, Dougal Alexander [Vis alle 10 forfattere av denne artikkelen] (2017). Bentonite layers in Svalbard: constraining sources of volcanism, geochronology, and relative plate motions during the Paleogene.
• Eide, Christian Haug; Schofield, Nick; Jerram, Dougal Alexander & Howell, John Anthony (2017). Basin-scale architecture of deeply emplaced sill complexes.
• Kjoberg, Sigurd; Schmiedel, Tobias; Planke, Sverre; Svensen, Henrik; Galland, Olivier & Jerram, Dougal Alexander (2016). 3D structure and formation of hydrothermal vent complexes in the Møre Basin.
• Jones, Morgan Thomas; Augland, Lars Eivind; Burgess, Seth; Eliassen, Gauti; Svensen, Henrik & Jerram, Dougal Alexander [Vis alle 9 forfattere av denne artikkelen] (2016). Bentonite layers in Svalbard: constraining sources of volcanism, geochronology, and relative plate motions during the Paleocene and Eocene.
• Jones, Morgan Thomas; Augland, Lars Eivind; Tegner, Christian; Planke, Sverre; Jerram, Dougal Alexander & Callegaro, Sara [Vis alle 8 forfattere av denne artikkelen] (2016). Volcano-climate interactions during the Paleocene-Eocene Thermal Maximum: Assessing the impact of the North Atlantic Igneous Province from the Fur Formation, Denmark.
• Planke, Sverre; Zuchuat, Valentin; Svensen, Henrik; Hammer, Øyvind; Braathen, Alvar & Silkoset, Petter [Vis alle 27 forfattere av denne artikkelen] (2016). Coring and High-Resolution Imaging of the Permian-Triassic Boundary in Deltadalen, Svalbard.
• Jones, Morgan Thomas; Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Grove, Clayton & Gislason, Sigurdur R. (2015). The effects of large igneous provinces on the global carbon and sulphur cycles: understanding the sources and the sinks.
• Planke, Sverre; Svensen, Henrik; Polozov, Alexander G. & Jerram, Dougal Alexander (2014). THE END-PERMIAN ENVIRONMENTAL CRISIS TRIGGERED BY VOLCANISM AND SEDIMENT DEGASSING OF THE TUNGUSKA BASIN, SIBERIA.
• Jerram, Dougal Alexander; Planke, Sverre; Svensen, Henrik; Polozov, Alexander G.; widdowson, mike & Wignall, Paul B. (2014). VOLCANICLASTIC ERUPTIONS AT THE ONSET OF FLOOD VOLCANISM; CONTRASTING EXAMPLES FROM SIBERIA AND EMISHAN PROVINCES.
• Jones, Morgan Thomas; Eliassen, Gauti Trygvason; Svensen, Henrik; Jochmann, Malte; Friis, Bjarki & Jerram, Dougal Alexander [Vis alle 7 forfattere av denne artikkelen] (2014). Understanding volcanism at the PETM: Abundant volcanic ash layers in the Central Tertiary Basin of Spitsbergen, Svalbard.

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