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Svensen, Henrik Hovland
(2024).
Grafikk i Østfold, deltakelse i gruppeutstilling.
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Svensen, Henrik Hovland
(2024).
Light in darkness - linocut workshop.
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Svensen, Henrik Hovland
(2024).
Vulkanutbrudd på Island og hvordan de kan påvirke oss.
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Svensen, Henrik Hovland
(2024).
Geologen som ble besatt av kunst.
[Fagblad].
Apollon.
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Svensen, Henrik Hovland
(2024).
Oppdatering om vulkanutbruddet på Island (januar 2024).
[TV].
NRK Dagsrevyen.
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Svensen, Henrik Hovland
(2024).
Vulkanutbruddet på Island (januar 2024).
[Radio].
NRK Nyhetsmorgen (radio/TV).
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Svensen, Henrik Hovland
(2023).
Kunst rett vest 2023.
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Svensen, Henrik Hovland
(2023).
Om vulkanutbruddet på Island (desember 2023).
[Radio].
NRK Nyhetsmorgen (radio/TV).
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Svensen, Henrik Hovland
(2023).
Oslos geologiske historie.
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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.
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Callegaro, Sara; Svensen, Henrik Hovland; Deegan, Frances M.; Planke, Sverre & Polozov, Alexander
(2022).
Magma-host rock interaction in basaltic sills from the Siberian Traps (Tunguska basin, Russia): mineral scale and whole-rock perspectives.
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Callegaro, Sara; Svensen, Henrik Hovland; Heimdal, Thea Hatlen; Kjøll, Hans Jørgen; Harstad, Andreas Olaus & Neumann, Else Ragnhild
(2022).
New insights on shallow intrusions from the early stage of the Oslo Rift. .
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Svensen, Henrik Hovland
(2022).
Hva skjuler seg under asfalten i Oslo?
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Svensen, Henrik Hovland
(2022).
Redd for antropocen.
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Svensen, Henrik Hovland
(2022).
Østfolds vakre bergarter og mystiske fortid.
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Svensen, Henrik Hovland & Kongevold, Laila
(2022).
Bokbad på utstillingen "En verden under føttene".
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Svensen, Henrik Hovland
(2022).
En verden under føttene.
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Svensen, Henrik Hovland & Torgersen, Eivind
(2022).
Norske byggeklosser – bergartene som bygget landet.
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Svensen, Henrik Hovland & Müller, Reidar
(2022).
Lanseringssamtale, Et land av stein.
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Svensen, Henrik Hovland
(2022).
Geologisk vandring i Oslo sentrum.
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Zuchuat, Valentin; Augland, Lars Eivind; Jones, Morgan Thomas; Sleveland, Arve R.N.; Twitchett, Richard & Tovar, Francisco J Rodríguez
[Vis alle 13 forfattere av denne artikkelen]
(2022).
The Permian-Triassic boundary across the Barents Shelf: an intricate record of climate change, mass extinction, recovery, and basin reorganisation.
EGU General Assembly.
doi:
10.5194/egusphere-egu22-2379.
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Einevoll, Gaute & Svensen, Henrik Hovland
(2022).
Podcast #51 i Vett og vitenskap.
[Internett].
Podcast "Vett og vitenskap".
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Svensen, Henrik Hovland
(2022).
Oslo under asfalten.
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Svensen, Henrik Hovland
(2022).
Ny bok om bergarter i Norge.
[Radio].
NRK P1+ Holm.
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Svensen, Henrik Hovland; Bøckmann, Petter & Bjorå, Charlotte Sletten
(2022).
Abels tårn.
[Radio].
EKKO; NRK P2.
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Berndt, Christian; Planke, Sverre; Zarikian, Carlos A.; Bünz, Stefan; Karstens, Jens & Svensen, Henrik Hovland
[Vis alle 8 forfattere av denne artikkelen]
(2022).
Shallow-water hydrothermal venting in the North Atlantic during the Paleocene Eocene Thermal Maximum.
Vis sammendrag
The Paleocene Eocene Thermal Maximum (PETM, ~56 Ma) was a rapid global warming of 5-6 ºC resulting from massive (>2000 Gigatons) carbon emissions. A potential release mechanism is thermogenic gas from contact metamorphism of carbon-bearing sediments due to magma intrusions into sedimentary basins. Here, we present seismic data and borehole information from the North Atlantic Igneous Province. They show that even in the center of the rift system, water depths were sufficiently shallow to allow most gas released from hydrothermal vent systems to bypass the water column. The shape of the vent craters and stratified infill suggest vigorous explosive gas release during the initial phase of vent formation and rapid shallow marine and largely undisturbed infill thereafter. The recorded negative carbon isotope excursion and occurrence of the index taxon Apectodinium augustum in the crater-infill support assignment to a latest Paleocene to earliest Eocene vent formation. The data support a scenario where magmatic sill emplacement and resulting hydrothermal activity rapidly injected thermogenic greenhouse gas into the atmosphere
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Bjærke, Marit Ruge; Ekström, Anders; Hastrup, Frida & Svensen, Henrik Hovland
(2022).
Bridging an epistemological gap: Roundtable on the importance of cooperation between the humanities and the natural sciences. .
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Svensen, Henrik Hovland
(2022).
Da Oslo eksploderte.
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Svensen, Henrik Hovland
(2022).
Oslos naturhistorie gjennom to milliarder år - og vulkanene på Ullern.
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Svensen, Henrik Hovland
(2022).
The Huken quarry and the resulting landscapes.
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Svensen, Henrik Hovland
(2022).
Science and art:
Experience from collaboration with artists - and using art in outreach
.
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Svensen, Henrik Hovland
(2022).
Geologien i Oslo-området.
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Svensen, Henrik Hovland
(2022).
Under asfalten.
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Svensen, Henrik Hovland
(2021).
Abels Tårn.
[Radio].
NRK P2.
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Svensen, Henrik Hovland
(2021).
Abels Tårn.
[Radio].
NRK P2.
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Svensen, Henrik Hovland
(2021).
Under asfalten. Oslos naturhistorie.
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Svensen, Henrik Hovland
(2021).
Under asfalten.
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Svensen, Henrik Hovland
(2021).
Geologien i Oslo området.
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Svensen, Henrik Hovland
(2021).
Lærdommer fra fortidens masseutryddelser og klimaendringer.
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Svensen, Henrik Hovland
(2021).
Tanker om faget.
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Svensen, Henrik Hovland
(2021).
Geological highlihts in Oslo - Excursion.
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Svensen, Henrik Hovland
(2021).
Oslos geologiske historie med fokus på leire.
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Svensen, Henrik Hovland
(2021).
Under asfalten- Oslos naturhistorie gjennom to milliarder år.
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Svensen, Henrik Hovland
(2021).
Vulkaner og jordens revolusjoner.
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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.
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Zuchuat, Valentin; Augland, Lars Eivind; Jones, Morgan Thomas; Twitchett, Richard; Rodríguez-Tovar, Francisco J. & Hammer, Øyvind
[Vis alle 11 forfattere av denne artikkelen]
(2021).
Facies changes, volcanism, and mass extinction conundrum: the Permian-Triassic boundary across the Barents Sea Shelf.
Vis sammendrag
The most dramatic mass extinction the Earth has ever experienced occurred 252 million years ago, at the end of the Permian. It was likely triggered by the volcanic eruptions and magmatic intrusions associated with the Siberian Traps Large Igneous Province (LIP), leading to dramatic climatic changes, with consequences lasting well into the Early Triassic.
Here, we present a summary of the findings from the study of several sedimentary successions distributed across the Barents Sea that spanned the End Permian Mass Extinction (EPME) and the Permian-Triassic boundary. The four studied successions included the renowned Festningen section in the outer part of Isfjorden, western Spitsbergen; the DD-1 core and the associated river section in Deltadalen, central Spitsbergen; a core drilled offshore Kvitøya in northern Svalbard, and a core drilled on the Horda Platform in the Barents Sea. Datasets of various research lines were collected from these sections including sedimentology, organic geochemistry, isotope, geochronology, XRF, mineralogy, ichnology, palaeontology, palynology and digital outcrop data.
Historically, the Permian-Triassic boundary exposed today in Svalbard (and at various places across the High Arctic regions) was placed at the very prominent and abrupt facies change occurring between the siliceous mudstones or spiculites of the Kapp Starostin Formation, and the overlying soft, non-siliceous mudstones and siltstones of the Vardebukta and Vikinghøgda formations. The abruptness of this facies change, which also marks the demise of sponges, led to the belief that it represented a hiatus or a gap of several million years, with the uppermost Permian strata missing from the sedimentary record, while the mudstones of the Vardebukta and Vikinghøgda formations were definitely of Lower Triassic age, based on ammonoid biostratigraphy.
Hindeodus parvus, the conodont that defines the base of the Triassic, was for the first time identified in Svalbard a few meters above the lithostratigraphic boundary, which is therefore of Upper Permian age. Additionally, our new data show that sedimentation was continuous across this lithostratigraphic boundary. This transition from the Kapp Starostin Formation to the Vardebukta and Vikinghøgda formations was accompanied by a major reorganisation/inversion of the basin(s), but its exact nature remains puzzling.
Further, all measured sections record the EPME, which is associated with a 6-8 ‰ δ13CVPDB negative excursion, and measured between the lithostratigraphic and the Permian-Triassic boundaries. These negative isotopic excursions are found in close vicinity to several tephra layers that have been precisely dated at 252.13 ± 0.62 Ma, strongly suggesting a connection to the Siberian Traps LIP event. The mass extinction is also confirmed by the very rapid decreasing of trace fossil abundance and diversity, as anoxia spread across the water from proximal and shallow water to deeper settings. Geochemical and ichnological data indicate the occurrence of several anoxic pulses, intersected by very brief episodes of improved oxygenation levels. It took ca. 145 Kyr for life to recover after the extinction event, based on sedimentation rate calculations. Data also suggest that a shift towards more arid climatic conditions and increased eutrophication on land accompanied the EPME.
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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.
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Svensen, Henrik & Müller, Reidar
(2020).
Under asfalten – Oslo lag for lag. Henrik Svensen i samtale Reidar Müller.
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Svensen, Henrik
(2020).
Bli med under asfalten i Oslo.
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Svensen, Henrik
(2020).
Oslos geologiske historie - en serie i tre deler i Ekko, NRK P2.
[Radio].
NRK P2 Ekko.
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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.
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Svensen, Henrik
(2020).
Dro på jakt etter vulkaner.
[Avis].
Aftenposten Junior.
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Svensen, Henrik
(2020).
Oslos lange geologiske historie.
[Radio].
NRK P2 Studio 2.
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Svensen, Henrik
(2020).
Ny bok om Oslos geologiske historie.
[Radio].
NRK Østlandssendingen.
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Svensen, Henrik
(2020).
Lansering av Under asfalten, bokbad.
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Svensen, Henrik
(2020).
Om Oslos geologiske historie.
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Stokke, Ella Wulfsberg; Jones, Morgan Thomas; Tierney, Jessica E.; Riber, Lars; Svensen, Henrik & Whiteside, Jessica H.
(2020).
Volcanic cooling followed by a warm and wet Paleocene-Eocene Thermal Maximum in Denmark.
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Bajard, Manon Julietto Andree; Ballo, Eirik Magnus Gottschalk; Støren, Eivind Wilhelm Nagel; Bakke, Jostein; Høeg, Helge Irgens & Loftsgarden, Kjetil
[Vis alle 9 forfattere av denne artikkelen]
(2020).
Tracing socio-environmental dynamics and climate changes in the period 300-1300 CE in Scandinavia from lake sediments.
Vis sammendrag
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.
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Åmli, Hanne; Fossen, Haakon & Svensen, Henrik
(2020).
Meta Morhp.
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