Henrik Svensen

• Stokke, Ella Wulfsberg; Jones, Morgan Thomas; Tierney, Jessica; Svensen, Henrik & Whiteside, Jessica H. (2020). Temperature changes across the Paleocene-Eocene Thermal Maximum – a new high-resolution TEX86 temperature record from the Eastern North Sea Basin. Earth and Planetary Science Letters.  ISSN 0012-821X.  544:116388, s 1- 10 . doi: 10.1016/j.epsl.2020.116388
• Augland, Lars Eivind; Ryabov, Viktor V.; Vernikovsky, Valery A.; Planke, Sverre; Polozov, Alexander; Callegaro, Sara; Jerram, Dougal Alexander & Svensen, Henrik (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 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.

• Ballo, Eirik Magnus Gottschalk; Augland, Lars Eivind; Hammer, Øyvind & Svensen, Henrik (2019). A new age model for the Ordovician (Sandbian) K-bentonites in Oslo, Norway. Palaeogeography, Palaeoclimatology, Palaeoecology.  ISSN 0031-0182.  520, s 203- 213 . doi: 10.1016/j.palaeo.2019.01.016 Full text in Research Archive.
• Heimdal, Thea Hatlen; Callegaro, Sara; Svensen, Henrik; Jones, Morgan Thomas; Pereira, Egberto & Planke, Sverre (2019). Evidence for magma–evaporite interactions during the emplacement of the Central Atlantic Magmatic Province (CAMP) in Brazil. Earth and Planetary Science Letters.  ISSN 0012-821X.  506, s 476- 492 . doi: 10.1016/j.epsl.2018.11.018
• Jones, Morgan Thomas; Percival, Lawrence; Stokke, Ella Wulfsberg; Frieling, Joost; Mather, Tasmin A.; Riber, Lars; Schubert, Brian A; Schultz, Bo; Tegner, Christian; Planke, Sverre & Svensen, Henrik (2019). Mercury anomalies across the Palaeocene–Eocene Thermal Maximum. Climate of the Past.  ISSN 1814-9324.  15(1), s 217- 236 . doi: https://doi.org/10.5194/cp-15-217-2019 Full text in Research Archive.
• Svensen, Henrik; Bjærke, Marit Ruge & Kverndokk, Kyrre (2019). The Past as a Mirror: Deep Time Climate Change Exemplarity in the Anthropocene. Culture Unbound. Journal of Current Cultural Research.  ISSN 2000-1525.  11(3-4), s 330- 352 . doi: 10.3384/cu.2000.1525.191134 Full text in Research Archive.
• Svensen, Henrik; Jerram, Dougal Alexander; Polozov, Alexander; Planke, Sverre; Neal, Clive R.; Augland, Lars Eivind & Emeleus, Henry C. (2019). Thinking about LIPs: A brief history of ideas in Large igneous province research. Tectonophysics.  ISSN 0040-1951.  760, s 229- 251 . doi: https://doi.org/10.1016/j.tecto.2018.12.008 Full text in Research Archive.
• Heimdal, Thea Hatlen; Svensen, Henrik; Ramezani, Jahandar; Iyer, Karthik Herman; Pereira, Egberto; Rodrigues, René; Jones, Morgan Thomas & Callegaro, Sara (2018). Large-scale sill emplacement in Brazil as a trigger for the end-Triassic crisis. Scientific Reports.  ISSN 2045-2322.  8 . doi: 10.1038/s41598-017-18629-8 Full text in Research Archive.
• Iyer, Karthik; Svensen, Henrik & Schmid, Daniel Walter (2018). SILLi 1.0: a 1-D numerical tool quantifying the thermal effects of sill intrusions. Geoscientific Model Development.  ISSN 1991-959X.  11(1), s 43- 60 . doi: 10.5194/gmd-11-43-2018 Full text in Research Archive.
• Mazzini, Adriano; Scholz, Florian; Svensen, Henrik; Hensen, Christian & Hadi, Soffian (2018). The geochemistry and origin of the hydrothermal water erupted at Lusi, Indonesia. Marine and Petroleum Geology.  ISSN 0264-8172.  90, s 52- 66 . doi: 10.1016/j.marpetgeo.2017.06.018 Full text in Research Archive.
• Svensen, Henrik; Frolov, Sergei; G., Akhmanov; Polozov, Alexander; Jerram, Dougal Alexander; Shiganova, O.; Melnikov, N.; Iyer, K. & Planke, Sverre (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
• Svensen, Henrik; Iyer, Karthik Herman; Schmid, Daniel Walter & Mazzini, Adriano (2018). Modelling of gas generation following emplacement of an igneous sill below Lusi, East Java, Indonesia. Marine and Petroleum Geology.  ISSN 0264-8172.  90, s 201- 208 . doi: 10.1016/j.marpetgeo.2017.07.007
• Svensen, Henrik; Torsvik, Trond Helge; Callegaro, Sara; Augland, Lars Eivind; Heimdal, Thea Hatlen; Jerram, Dougal Alexander; Planke, Sverre & Pereira, Egberto (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
• Angkasa, Syahreza Saidina; Jerram, Dougal Alexander; Millett, John M; Svensen, Henrik; Planke, Sverre; Taylor, Ross A; Schofield, Nick & Howell, John (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.
• Fristad, Kirsten; Svensen, Henrik; Polozov, Alexander & Planke, Sverre (2017). Formation and evolution of the end–Permian Oktyabrsk volcanic crater in the Tunguska Basin, Eastern Siberia. Palaeogeography, Palaeoclimatology, Palaeoecology.  ISSN 0031-0182.  468, s 76- 87 . doi: 10.1016/j.palaeo.2016.11.025
• Hammer, Øyvind & Svensen, Henrik (2017). Biostratigraphy and carbon and nitrogen geochemistry of the SPICE event in Cambrian low-grade metamorphic black shale, Southern Norway. Palaeogeography, Palaeoclimatology, Palaeoecology.  ISSN 0031-0182.  468, s 216- 227 . doi: 10.1016/j.palaeo.2016.12.016
• Jones, Morgan Thomas; Augland, Lars Eivind; Shephard, Grace; Burgess, Seth; Eliassen, Gauti Trygvason; Jochmann, Malte; Friis, Bjarki; Jerram, Dougal Alexander; Planke, Sverre & Svensen, Henrik (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 Full text in Research Archive.
• Kjoberg, Sigurd; Schmiedel, Tobias; Planke, Sverre; Svensen, Henrik; Millett, John; Jerram, Dougal Alexander; Galland, Olivier; Lecomte, Isabelle; Schofield, Nick; Haug, Øystein Thorden & Helsem, Andreas (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 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.

• Mazzini, Adriano; Svensen, Henrik; Forsberg, Carl Fredrik; Linge, Henriette; Lauritzen, Stein-Erik; Haflidason, Haflidi; Hammer, Øyvind; Planke, Sverre & Tjelta, Tor-Inge (2017). A climatic trigger for the giant Troll pockmark field in the northern North Sea. Earth and Planetary Science Letters.  ISSN 0012-821X.  464, s 24- 34 . doi: 10.1016/j.epsl.2017.02.014 Full text in Research Archive. Show summary

  Pockmarks are seafloor craters usually formed during methane release on continental margins. However, the mechanisms behind their formation and dynamics remain elusive. Here we report detailed investigations on one of the World's largest pockmark fields located in the Troll region in the northern North Sea. Seafloor investigations show that >7000 pockmarks are present in a ∼600 km2 area. A similar density of pockmarks is likely present over a 15,000 km2 region outside our study area. Based on extensive monitoring, coring, geophysical and geochemical analyses, no indications of active gas seepage were found. Still, geochemical data from carbonate blocks collected from these pockmarks indicate a methanogenic origin linked to gas hydrate dissociation and past fluid venting at the seafloor. We have dated the carbonates using the U–Th method in order to constrain the pockmark formation. The carbonates gave an isochron age of 9.59±1.38 ka9.59±1.38 ka, i.e. belonging to the initial Holocene. Moreover, radiocarbon dating of microfossils in the sediments inside the pockmarks is consistent with the ages derived from the carbonates. Based on pressure and temperature modelling, we show that the last deglaciation could have triggered dissociation of gas hydrates present in the region of the northern part of the Norwegian Channel, causing degassing of 0.26 MtCH4/km2 at the seafloor. Our results stress the importance of external climatic forcing of the dynamics of the seafloor, and the role of the rapid warming following the Younger Dryas in pacing the marine gas hydrate reservoir.

• Neumann, Else Ragnhild; Svensen, Henrik; Polozov, Alexander & Hammer, Øyvind (2017). Formation of Si-Al-Mg-Ca-rich zoned magnetite in an end-Permian phreatomagmatic pipe in the Tunguska Basin, East Siberia. Mineralium Deposita.  ISSN 0026-4598.  Published ahead of print . doi: 10.1007/s00126-017-0717-9
• Stordal, Frode; Svensen, Henrik; Aarnes, Ingrid & Roscher, Marco (2017). Global temperature response to century-scale degassing from the Siberian Traps Large igneous province. Palaeogeography, Palaeoclimatology, Palaeoecology.  ISSN 0031-0182.  471, s 96- 107 . doi: 10.1016/j.palaeo.2017.01.045 Show summary

  The Siberian Traps Large igneous province was a key player in the end-Permian extinction and climatic change due to degassing from lavas and heated sedimentary rocks. Although the specific degassing scenarios from the province are debated, this implies that gas release on a timescale tuned to the cooling of lava flows and subvolcanic intrusions (i.e. decades to centuries) must have been sufficient to affect the atmospheric chemistry. Here we test this assumption by using simple box model calculations to constrain century-scale degassing of CO2 and CH4 from high-end volumes of individual lava flows and sills from the Siberian Traps. The model includes gas fluxes of CH4 and CO2, their atmospheric lifetimes and radiative forcing, as well as the climate sensitivity in a global average climate system calibrated to end-Permian time. The fluxes are estimated based on lava degassing and contact aureole volumes and devolatilization during the first 100 years following emplacement. We test the sensitivity to extreme emissions of up to 25 GtC/yr, CH4 fractions from 0 to 100%, wide ranges of climate sensitivities (1.5–6.0 °C for CO2 doubling), pre-event concentrations, and atmospheric lifetimes. We find that the global annual mean temperature perturbation is 7.0 °C in our baseline case using a 10 GtC/yr emission and a 60% CH4 fraction, assuming 4.5 °C as the climate sensitivity. Even for low emission scenarios (0.7–1.2 GtC/yr), the temperature response is ~ 1.5 °C. We conclude that sporadic individual large-scale volcanic events in Large igneous provinces have the potential to cause a strong global warming on very short timescales. In addition to the emission strength, the CH4 fraction and the climate sensitivity have the strongest impact on the century-scale temperature perturbation.

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• Svensen, Henrik (2018). Stein på stein. På sporet av den største masseutryddelsen i jordens historie. Aschehoug & Co.  ISBN 978-82-03-29446-4.  239 s.

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• Bajard, Manon Julietto Andree; Ballo, Eirik Magnus Gottschalk; Støren, Eivind Wilhelm Nagel; Bakke, Jostein; Høeg, Helge Irgens; Loftsgarden, Kjetil; Iversen, Frode; Svensen, Henrik & Krüger, Kirstin (2020). Tracing socio-environmental dynamics and climate changes in the period 300-1300 CE in Scandinavia from lake sediments. Show summary

  Understanding large volcanic eruptions impacts on environments and societies is necessary to consider future climate and socio-environmental interactions. Lake sediments can record these dynamics on a continuous long time scale and include at the same time footprints from volcanic eruptions, climate changes and human activities. We analysed the sediments of Lake Ljøgottjern, located southeastern Norway. The largest burial mound of Northern Europe was built in the mid-6th century on the shore of this lake and makes this place an ideal site to study human-environmental interactions throughout the last millennia. Using a multi-proxy analysis of this sedimentary record, including 14C dating, geochemistry, as well as palynological data, we reconstructed temperature and socio-environmental changes in this area between 300 and 1300 CE (Common Era). We associated changes in Ca/Ti ratio with changes in temperature. The period between 300 and 800 CE was colder than the periods 200-300 and 800-1300 CE. Five abrupt cooling events seem to be linked to weakened positive NAO (North Atlantic Oscillation) phases, and two of them can also be linked to the two largest volcanic events of the period (i.e. the 536/540 CE double event, and 1257 CE eruption of Samalas). Palynological data indicate a decrease of the human activities and reforestation of the area in the 6th century. This abandonment is consistent with archaeological findings and could be related to the 536/540 cooling event. Very little activities are then recorded between 700 and 850 CE. Agricultural activities start again strongly in the Viking age with increase in temperature.

• Åmli, Hanne; Fossen, Haakon & Svensen, Henrik (2020). Meta Morhp.
• Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and Viking age.
• Ballo, Eirik Magnus Gottschalk; Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and the Viking age.
• Ballo, Eirik Magnus Gottschalk; Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and Viking age.
• Ballo, Eirik Magnus Gottschalk; Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and Viking age.
• Ballo, Eirik Magnus Gottschalk; Bajard, Manon Julietto Andree; Støren, Eivind Wilhelm Nagel; Bakke, Jostein & Svensen, Henrik (2019). High-resolution lacustrine records of environmental changes in Scandinavia: a focus on the Migration period and Viking age.
• Bostic, Joshua Neilson; Hagopian, William Martin; Svensen, Henrik & Jahren, Anne Hope (2019). Predicting seasonal climate using intra-ring stable isotope analysis. Show summary

  By emitting stratospheric sulphur aerosol clouds that dim the light-energy received from the sun, large-scale volcanic eruptions may cause acute changes in global climate that impact both natural ecosystems and human societies. One example is the 536 Event, a prolonged period of darkness and cooling across the northern hemisphere caused by two separate volcanic eruptions in 536 and 540 CE. Recent mean annual temperature (MAT) and mean annual precipitation (MAP) reconstructions suggest that the decade following the 536 event was one of the coldest and wettest of the past two millennia. This cold period likely contributed to the cultural upheavals that occurred in Scandinavia during the 6th century by reducing the geographic range suitable for cereal grain production. However, while annually-resolved MAT and MAP reconstructions are useful for identifying climatic perturbations, they provide limited insight into the effects of such climate anomalies on regional agricultural productivity due to their limited ability to differentiate summer and winter climatic conditions. To accurately estimate the number of days suitable for growing crops, or Growing Degree Days (GDD), seasonal resolution must be achieved by determining the ratio of summer to winter temperature and precipitation. To reconstruct growing season temperature and precipitation across southern Scandinavia in the decade following the 536 event (535-545 CE), we will combine prior reconstructions of annual mean data with novel analyses of summer/winter temperature and precipitation ratios derived from intra-ring carbon and oxygen stable isotope analysis of Picea abies collected from Raknehaugen, a burial mound in southern Norway constructed in 551 CE. These growing season temperature and precipitation estimates will be combined with other geo-climatic data (latitude, altitude etc.) for regional GDD reconstruction to ultimately determine changes in the geographic range suitable for crop production in Southern Norway following the 536/540 double event. Here, we 1.) Provide a conceptual outline of the project’s expected outcomes and 2.) Demonstrate the ability of intra-ring stable isotope analysis to detect short-term seasonal climatic perturbations in Scandinavia by reconstructing the European summer drought of 1959 from estimates of summer/winter temperature and precipitation ratios derived from stable isotope patterns in Picea abies samples from two locations in southern Norway.

• Gaina, Carmen; Mac Niocaill, Conall; Conrad, Clinton Phillips; Steinberger, Bernhard & Svensen, Henrik (2019). Linking plate tectonics and volcanism to deep earth dynamics - A tribute to Trond H. Torsvik. Tectonophysics.  ISSN 0040-1951.  760, s 1- 3 . doi: 10.1016/j.tecto.2019.03.002
• Heimdal, Thea Hatlen; Svensen, Henrik; Jones, Morgan Thomas; Callegaro, Sara & Pereira, Egberto (2019). Thermogenic Gas Release from CAMP as a Trigger for the End-Triassic Crisis.
• Jones, Morgan Thomas; Hammer, Øyvind; Bucher, Hugo; Schneebeli-Hermann, Elke; Mather, Tamsin; Svensen, Henrik & Planke, Sverre (2019). Are Mercury Anomalies a Reliable Proxy for LIP Volcanism? Examples from the End-Permian and Early Triassic.
• Jones, Morgan Thomas; Stokke, Ella Wulfsberg; Pogge von Stradmann, Philip; Augland, Lars Eivind; Svensen, Henrik; Whiteside, Jessica H. & Tierney, Jessica (2019). Ashlantic: A multi-proxy approach to understanding the relationship between the North Atlantic Igneous Province and the Paleocene-Eocene Thermal Maximum.
• Jones, Morgan Thomas; Stokke, Ella Wulfsberg; Pogge von Strandmann, Philip A.E.; Augland, Lars Eivind; Svensen, Henrik; Whiteside, Jessica H. & Tierney, Jessica (2019). ASHLANTIC: A multi-proxy approach to understanding the relationship between the NAIP and the PETM.
• 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.
• Stokke, Ella Wulfsberg; Whiteside, Jessica H.; Riber, Lars; Haflidason, Haflidi; Tierney, Jessica E; Svensen, Henrik & Jones, Morgan Thomas (2019). Linking warming, environmental changes, and volcanic ash falls from onset to recovery of the PETM: a multi-proxy study from Fur, Denmark.
• Svensen, Henrik (2019). Dyp tid, klimaendringer og eksemplaritet.
• Svensen, Henrik (2019). Gruveslam på dypt vann. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2019). Går det til helvete?.
• Svensen, Henrik (2019). Jessica Lönn-Stensrud i samtale med Henrik Svensen: «Vi må snakke om bakterier. En samtale om bøker og bakterier» (boklansering).
• Svensen, Henrik (2019). Masseutryddelsene: Da livet nesten ble utslettet.
• Svensen, Henrik (2019). Menneskets fotavtrykk. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2019). Nytt lys over mørk dag. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2019). Når vulkanen kollapser. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2019). Panelsamtale: «Derfor skriver og gir vi ut popvit-bøker. Men hvem leser?», med Jorunn Sandsmark, Johan Tønnesson, Sverre Gunnar Haga og Henrik Svensen.
• Svensen, Henrik (2019, 21. mars). Vann. [Radio].  NRK P2 Ekko.
• Svensen, Henrik (2019). Å skrive for livet: populærvitenskap, forskermemoarer og IMRAD, I: Iben Brinch Jørgensen & Norunn Askeland (red.),  Kreativ akademisk skriving.  Universitetsforlaget.  ISBN 9788215031620.  Kapittel 8.  s 157 - 178
• Svensen, Henrik; John, Timm; Weyer, Stefan; Fristad, Kirsten; Polozov, Alexander; Bajard, Manon Julietto Andree; Jones, Morgan Thomas & Planke, Sverre (2019). Bacterial sulphate- and iron reduction in a Siberian Traps crater lake during the end-Permian crisis.
• Delsett, Lene Liebe; Svensen, Henrik; Sletsjøe, Arne Bernhard & Jemterud, Torkild (2018, 23. mars). Abels tårn 23. mars 2018. [Radio].  NRK P2 Ekko.
• Heimdal, Thea Hatlen; Svensen, Henrik; Ramezani, Jahandar; Iyer, Karthik Herman; Pereira, Egberto; Rodrigues, René; Jones, Morgan Thomas & Callegaro, Sara (2018). Large-scale sill emplacement in Brazil as a trigger for the end-Triassic crisis.
• Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Millett, John M; Jones, Morgan Thomas; Augland, Lars Eivind & Abdelmalak, Mansour (2018). Types and styles of volcanism in the North Atlantic Igneous Province: Implications towards understanding their potential climatic impact..
• Jones, Morgan Thomas; Percival, Lawrence; Stokke, Ella Wulfsberg; Frieling, Joost; Mather, Tamsin; Riber, Lars; Schubert, Brian A & Svensen, Henrik (2018). Investigating mercury as a large igneous province proxy: Insights from the Palaeocene-Eocene Thermal Maximum.
• Jones, Morgan Thomas; Stokke, Ella Wulfsberg; Schultz, Bo; Augland, Lars Eivind; Planke, Sverre; Tegner, Christian; Mather, Tamsin; Percival, Lawrence & Svensen, Henrik (2018). Fur Island in Denmark: A window into Paleocene-Eocene hyperthermals and North Atlantic volcanism.
• Stokke, Ella Wulfsberg; Jones, Morgan Thomas; Hammer, Øyvind & Svensen, Henrik (2018). Geochemical variations during the PETM and later Eocene hyperthermals: investigating a new drill core from Fur, Denmark.
• Stokke, Ella Wulfsberg; Jones, Morgan Thomas; Hammer, Øyvind & Svensen, Henrik (2018). Geochemistry of Paleocene- Eocene sediments on Fur, Denmark: Linking volcanism and climatic changes.
• Stokke, Ella Wulfsberg; Whiteside, Jessica H.; Svensen, Henrik; Hammer, Øyvind & Jones, Morgan Thomas (2018). Linking warming, environmental changes, and volcanic ash falls from onset to recovery of the PETM: investigations from Fur, Denmark.
• Svensen, Henrik (2018). Asken fra ilden. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2018). Den største masseutryddelsen.
• Svensen, Henrik (2018). Den største utryddelsen rykker nærmere. Aftenposten (morgenutg. : trykt utg.).  ISSN 0804-3116.
• Svensen, Henrik (2018). Diamanter og gull under havet. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2018). Eldgammel forurensning. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2018). Elver med evig liv. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2018). Farvel, holocen. En kort naturhistorie for tiden etter siste istid, I: Peter Bjerregaard & Kyrre Kverndokk (red.),  Kollaps. På randen av fremtiden..  Dreyer Forlag A/S.  ISBN 9788282654234.  4.  s 47 - 57
• Svensen, Henrik (2018, 02. mars). Finner svar i steinene.  Klassekampen.
• Svensen, Henrik (2018, 27. mars). Følger sporet av den største masseutryddelsen i jordens historie. [Internett].  ABC nyheter.
• Svensen, Henrik (2018). Geologien i Slemmestad.
• Svensen, Henrik (2018). Geologien i Spikkestad.
• Svensen, Henrik (2018). Jordens kriser.
• Svensen, Henrik (2018, 01. april). Mellom forskning og formidling. [Fagblad].  NFFO jubileumsmagasin.
• Svensen, Henrik (2018). Menneskets tidsalder.
• Svensen, Henrik (2018). Regn og rasende jord. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2018). Stein på stein.
• Svensen, Henrik (2018, 09. mai). Stein på stein, en ny bok. [Radio].  NRK Østfold.
• Svensen, Henrik (2018). Travels to the end of the world.
• Svensen, Henrik (2018, 23. desember). Tsunamien i Indonesia, 22. desember 2018. [TV].  TV2 nyhetene.
• Svensen, Henrik (2018, 23. desember). Ukas NFFO-er. [Internett].  NFFO nettside.
• Svensen, Henrik (2018). Verdens viktigste fagfelt.
• Svensen, Henrik (2018, 09. januar). Vulkanutbrudd skapte fimbulvinteren.  Vårt Land.
• Svensen, Henrik (2018). Å overleve en tsunami. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2018, 22. april). Øy i Stillehavet blir ubeboelig.  dagbladet.no.
• 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.
• Svensen, Henrik; Percival, Lawrence; Jones, Morgan Thomas & Mather, Tamsin (2018). Release of mercury from black shale during contact metamorphism and the implications for mercury as a volcanic proxy.
• Jerram, Dougal Alexander; Svensen, Henrik; Planke, Sverre; Millett, John M & Reynolds, Pete (2017). Sill induced hydrothermal venting: A summary of our current understanding..
• Jones, Morgan Thomas; Augland, Lars Eivind; Shephard, Grace; Burgess, Seth; Eliassen, Gauti; Jerram, Dougal Alexander; Jochmann, Malte; Friis, Bjarki; Planke, Sverre & Svensen, Henrik (2017). Bentonite layers in Svalbard: constraining sources of volcanism, geochronology, and relative plate motions during the Paleogene.
• Jones, Morgan Thomas; Percival, Lawrence; Frieling, Joost; Mather, Tasmin A. & Svensen, Henrik (2017). Assessing the variation in mercury deposition around the North Atlantic during the Palaeocene-Eocene Thermal Maximum (PETM).
• Mazzini, Adriano; Svensen, Henrik; Forsberg, Carl Fredrik; Linge, Henriette; Lauritzen, Stein-Erik; Haflidason, Haflidi; Hammer, Øyvind; Planke, Sverre & Tjelta, Tor-Inge (2017). A Climatic Trigger for the Giant Troll Pockmark Field in the Northern North Sea. Show summary

  Pockmarks are seafloor craters usually formed during methane release on continental margins. However, the mechanisms behind their formation and dynamics remain elusive. Here we report detailed investigations on one of the World’s largest pockmark fields located in the Troll region in the northern North Sea. Seafloor investigations show that >7000 pockmarks are present in a ~600 km2 area. A similar density of pockmarks is likely present over a 15,000 km2 region outside our study area. Based on extensive monitoring, coring, geophysical and geochemical analyses, no indications of active gas seepage were found. Still, geochemical data from carbonate blocks collected from these pockmarks indicate a methanogenic origin linked to gas hydrate dissociation and past fluid venting at the seafloor. We have dated the carbonates using the U-Th method in order to constrain the pockmark formation. The carbonates gave an isochron age of 9.59 ± 1.38 ka BP, i.e. belonging to the initial Holocene. Moreover, radiocarbon dating of microfossils in the sediments inside the pockmarks are consistent with the ages derived from the carbonates. Based on pressure and temperature modelling, we show that the last deglaciation could have triggered dissociation of gas hydrates present in the region of the northern part of the Norwegian Channel, causing degassing of 0.26 MtCH4/km2 at the seafloor. Our results stress the importance of external climatic forcing of the dynamics of the seafloor, and the role of the rapid warming following the Younger Dryas in pacing the marine gas hydrate reservoir.

• 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..
• Svensen, Henrik (2017). Antropocen og den dype tiden.
• Svensen, Henrik (2017). Den største masseutryddelsen.
• Svensen, Henrik (2017). Dette bør du vite om menneskets tidsalder.
• Svensen, Henrik (2017). Et hint av tobakk i edens hage. Morgenbladet.  ISSN 0805-3847.
• Svensen, Henrik (2017). HVorfor formidle?.
• Svensen, Henrik (2017). Jordens store masseutryddelser.
• Svensen, Henrik (2017). Masteroppgaver, akademisk skriving og formidling.
• Svensen, Henrik (2017, 27. oktober). Om supervulkaner. [Radio].  NRK P1.
• Svensen, Henrik (2017, 28. november). Om utbruddet fra Agung. [Radio].  NRK P1 Norgesglasset.
• Svensen, Henrik (2017, 26. oktober). Supervulkaner. [Radio].  NRK Kuriøs.
• Svensen, Henrik (2017, 27. november). Vulkanen Agung er aktiv. [Radio].  NRKP2 nyhetslunsj.
• van Soelen, Elsbeth Ester; Hasic, Edi; Planke, Sverre; Svensen, Henrik; Sleveland, Arve Rein Nes; Midtkandal, Ivar; Twitchett, Richard & Kürschner, Wolfram Michael (2017). Permian-Triassic palynofacies and chemostratigraphy in a core recovered from central Spitsbergen..

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