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Jean-Baptiste Koehl

Jean-Baptiste Koehl
Centre for Earth Evolution and Dynamics

Ph.D.

About

95
Publications
9,144
Reads
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120
Citations
Additional affiliations
January 2020 - present
UiT The Arctic University of Norway
Position
  • Researcher
July 2019 - December 2019
UiT The Arctic University of Norway
Position
  • Researcher
Description
  • Tested own hypothesis of NW-SE-striking Timanian faults crosscutting Svalbard and the Barents Sea and helped supervise one Ph.D. student.
April 2019 - present
University of Oslo
Position
  • Researcher
Education
March 2015 - March 2018
UiT The Arctic University of Norway
Field of study
  • Tectonics, Structural Geology, Geophysics
August 2010 - May 2013
UiT The Arctic University of Norway
Field of study
  • Crustal Dynamics, Tectonics, Structural Geology
September 2007 - June 2010
University of Burgundy
Field of study
  • Earth Sciences, Tectonics, Geochronology, Sedimentology, Volcanology

Publications

Publications (95)
Presentation
Full-text available
The present study is a detailed structural analysis of 3D seismic data in the Selis Ridge in the western part of the Loppa High in the Norwegian Barents Sea, to which new seismic attributes and spectral decomposition were applied. The analysis reveals that pre-Devonian basement rocks in the Barents Sea are crosscut by a 40–50 kilometers wide, sever...
Presentation
Full-text available
Presentation of the following publications and discussion of their implications: -Koehl, J.-B. P. and Allaart, L.: The Billefjorden Fault Zone north of Spitsbergen: a major terrane boundary?, Polar Res., 40, 7668, 2021. doi.org/10.33265/polar.v40.7668 -Koehl, J.-B. P., Magee, C. and Anell, I. M.: Impact of Timanian thrust systems on the late Neopro...
Preprint
Full-text available
In the Late Devonian–earliest Mississippian, Svalbard was affected by a short-lived episode of deformation named the Ellesmerian (Svalbardian) Orogeny. This event resulted in intense folding and thrusting in Devonian sedimentary successions. Deformation stopped prior to the deposition of Carboniferous–Permian sedimentary strata of the Billefjorden...
Article
Full-text available
The Svalbard Archipelago consists of three basement terranes that record a complex Neoproterozoic–Phanerozoic tectonic history, including four contractional events (Grenvillian, Caledonian, Ellesmerian, and Eurekan) and two episodes of collapse- to rift-related extension (Devonian–Carboniferous and late Cenozoic). Previous studies suggest that thes...
Presentation
Full-text available
The Svalbard Archipelago offers the most complete record of the geological history of Norway preserved as various rock units from 3.0 Ga to a few thousand years ago. Recent geological work has shown that the Earth’s crust beneath the Archipelago is transected by several kilometers thick and thousands of kilometers long networks of cracks. These lar...
Presentation
Full-text available
Online presentation to the Institute for Geophysics, Polish Academy of Science (IG PAS)
Preprint
Full-text available
The present contribution reexamines the geometry of a segment of a presumably long-lived fault in the Norwegian Arctic, the Balliolbreen Fault segment of the Billefjorden Fault Zone. Field observations demonstrate that the fault most probably originated as a top-west Eurekan thrust fault in the early Cenozoic and that weak lithological units such a...
Article
Full-text available
The Billefjorden Fault Zone is a major terrane boundary in the Norwegian Arctic. The fault separates basement rocks of Svalbard’s north-eastern and north-western terranes that recorded discrete Precambrian tectonothermal histories and were accreted, intensely deformed and metamorphosed during the Caledonian Orogeny. Although the fault represents a...
Article
Full-text available
The Billefjorden Fault Zone is a major terrane boundary in the Norwegian Arctic. The fault separates basement rocks of Svalbard’s north-eastern and north-western terranes that recorded discrete Precambrian tectonothermal histories and were accreted, intensely deformed and metamorphosed during the Caledonian Orogeny. Although the fault represents a...
Presentation
While the weather in Iceland is often cold, wet, and windy, a nearly endless supply of heat bubbles away below the surface. In fact, almost every building in the country is heated by geothermal energy in a process with virtually no carbon emissions. So how exactly does this renewable energy work? Jean-Baptiste P. Koehl explores the two primary mode...
Preprint
Full-text available
The Svalbard Archipelago is composed of three basement terranes that record a complex Neoproterozoic-Phanerozoic tectonic history, including four contractional events (Grenvillian, Caledonian, Ellesmerian, and Eurekan) and two episodes of collapse-to rift-related extension (Devonian-Carboniferous and late Cenozoic). These three terranes are thought...
Article
Full-text available
The present study of field, petrological, exploration well, and seismic data describes backward-dipping duplexes comprised of phyllitic coal and bedding-parallel décollements and thrusts localized along lithological transitions in tectonically thickened Lower Devonian to lowermost Upper Devonian; uppermost Devonian–Mississippian; and uppermost Penn...
Preprint
Full-text available
The Billefjorden Trough, a well studied onshore analogue to Carboniferous rift basins in the Barents Sea, is bounded to the west by the Billefjorden Fault Zone. Structural field analysis of a megabreccia and adjacent strata of the Minkinfjellet Formation in the hanging wall of the Odellfjellet Fault segment of the Billefjorden Fault Zone suggest th...
Presentation
Presentation of the ArcTec project to Lundin.
Preprint
Full-text available
The Billefjorden Fault Zone is a major terrane boundary in the Norwegian Arctic. The fault separates basement rocks of Svalbard’s northeastern and northwestern terranes that recorded discrete Precambrian tectonothermal histories and were accreted, intensely deformed and metamorphosed during the Caledonian Orogeny. Although the fault represents a ma...
Poster
Full-text available
The Vestnesa Ridge is a 4–5 kilometers thick sedimentary drift of contourites deposited by NW-travelling bottom currents over young oceanic crust (< 24 Ma) between Svalbard and the Molloy Ridge. The ridge trends NW–SE and parallels major transform faults in the Fram Strait (Spitsbergen and Molloy fracture zones). Along the southeastern portion of t...
Conference Paper
Full-text available
The Vestnesa Ridge is a 4–5 kilometers thick sedimentary drift of contourites deposited by NW-travelling bottom currents over young oceanic crust (< 24 Ma) between Svalbard and the Molloy Ridge. The ridge trends NW–SE and parallels major transform faults in the Fram Strait (Spitsbergen and Molloy fracture zones). Along the southeastern portion of t...
Presentation
Full-text available
The Vestnesa Ridge is a 4–5 kilometers thick sedimentary drift of contourites deposited by NW-travelling bottom currents over young oceanic crust (< 24 Ma) between Svalbard and the Molloy Ridge. The ridge trends NW–SE and parallels major transform faults in the Fram Strait (Spitsbergen and Molloy fracture zones). Along the southeastern portion of t...
Preprint
Full-text available
The Billefjorden area is located in central Spitsbergen where Lower-lowermost Upper Devonian deposits of the southeastern part of the northern Spitsbergen Devonian collapse basin presumably affected by Late Devonian Ellesmerian folds and thrusts are juxtaposed against Proterozoic basement rocks overlain by uppermost Devonian-early Permian rift depo...
Preprint
Full-text available
The present study of field, petrological, exploration well and seismic data shows that backward-dipping duplexes comprised of phyllitic coal and bedding-parallel décollements and thrusts, which 15 localized along lithological transitions in tectonically thickened Lower-lowermost Upper Devonian, uppermost Devonian-Mississippian and uppermost Pennsyl...
Research Proposal
Full-text available
ArcTec proposes to study (1) the westward extent, kinematics and timing of formation, and (2) reactivation–overprint of Timanian (i.e., ca. 600 million years old) faults during subsequent tectonic events in the Arctic, and to (3) insert these faults into a detailed tectonic evolution model for Svalbard, the northwestern Barents Sea and the Fram Str...
Presentation
Full-text available
Despite more than a century of investigation, the relationship between basement rocks throughout the Svalbard Archipelago is still a mystery. Though these rocks display similar geochronological ages, they show significantly different metamorphic grades and structures. Thus far, Svalbard was believed to be composed of three terranes of rocks formed...
Preprint
Full-text available
Abstract. In the Late Devonian, Svalbard was affected by a short-lived episode of contraction called the Ellesmerian (Svalbardian) Orogeny, which resulted in top-west thrusting of Proterozoic basement rocks onto Devonian sedimentary strata along the Balliolbreen Fault, a major fault segment of the east-dipping Billefjorden Fault Zone, and juxtaposi...
Poster
Full-text available
Despite more than a century of investigation, the relationship between basement rocks throughout the Svalbard Archipelago is still a mystery. Though these rocks display similar geochronologic ages, they show significantly different metamorphic grades and structures. Thus far, Svalbard was believed to be composed of three-four terranes of rocks form...
Conference Paper
Full-text available
Despite more than a century of investigation, the relationship between basement rocks throughout the Svalbard Archipelago is still a mystery. Though these rocks display similar geochronological ages, they show significantly different metamorphic grades and structures. Thus far, Svalbard was believed to be composed of three terranes of rocks formed...
Conference Paper
Full-text available
Despite more than a century of investigation, the relationship between basement rocks throughout the Svalbard Archipelago is still a mystery. Though these rocks display similar geochronological ages, they show significantly different metamorphic grades and structures. Thus far, Svalbard was believed to be composed of three terranes of rocks formed...
Presentation
Full-text available
Despite more than a century of investigation, the relationship between basement rocks throughout the Svalbard Archipelago is still a mystery. Though these rocks display similar geochronological ages, they show significantly different metamorphic grades and structures. Thus far, Svalbard was believed to be composed of three terranes of rocks formed...
Article
Full-text available
In the SW Barents Sea, Devonian–Carboniferous collapse led to the formation of major basins and faults, e.g., the Hammerfest Basin bounded by the Troms–Finnmark Fault Complex, and rhomboid- to sigma-shaped (half-)grabens on the Finnmark Platform. High-resolution aeromagnetic and bathymetry data from the shallow shelf show that analogue fault system...
Presentation
Full-text available
The presentation reviews the impact of inherited, WNW-ESE-striking, Timanian thrust systems on the Phanerozoic tectonic history of Spitsbergen and the possible link of Devonian-Mississippian dykes with diamond-bearing intrusions in northwestern Russia.
Presentation
In 132 CE, Zhang Heng presented his latest invention: a large vase he claimed could tell them whenever an earthquake occurred for hundreds of miles. Today, we no longer rely on pots as warning systems, but earthquakes still offer challenges to those trying to track them. Why are earthquakes so hard to anticipate, and how could we get better at pred...
Article
Full-text available
In the Devonian–Carboniferous, a rapid succession of clustered extensional and contractional tectonic events is thought to have affected sedimentary rocks in central Spitsbergen, Svalbard. These events include Caledonian post-orogenic extensional collapse associated with the formation of thick Early–Middle Devonian basins, Late Devonian–Mississippi...
Poster
Full-text available
Alternative tectonic mechanisms to explain why folded Devonian strata are covered by relatively undeformed Carboniferous strata and angular unconformities within Devonian and Carboniferous sedimentary successions in Spitsbergen.
Article
Full-text available
In the Devonian–Carboniferous, a rapid succession of clustered extensional and contractional tectonic events is thought to have affected sedimentary rocks in central Spitsbergen. These events include Caledonian post-orogenic extensional collapse associated with the formation of thick Early–Middle Devonian basins, Late Devonian–Mississippian Ellesme...
Research Proposal
Research proposal for a Post-doctoral fellowship to the VISTA grant.
Article
Full-text available
Well-preserved fault gouge along brittle faults in Paleoproterozoic, volcano-sedimentary rocks of the Raipas Supergroup exposed in the Alta–Kvænangen tectonic window in northern Norway yielded latest Mesoproterozoic (approximately 1050 ± 15 Ma) to mid-Neoproterozoic (approximately 825–810 ± 18 Ma) K–Ar ages. Pressure–temperature estimates from micr...
Thesis
Full-text available
In northern Norway, late/post-Caledonian extension initiated along inverted, brittle-ductile thrusts, e.g., Sørøya-Ingøya shear zone, which truncated existing, margin-oblique, late Neoproterozoic, Timanian faults and margin-parallel, latest Mesoproterozoic-mid Neoproterozoic faults related to the opening of the Asgard Sea and Iapetus Ocean. Inverte...
Presentation
Full-text available
Presentation
Video recording of the following Ph.D. trial lecture: The Caledonides and their role in North Atlantic–Arctic opening.
Presentation
Video recording of the following Ph.D. defense presentation: Mid/Late Devonian–Carboniferous extensional faulting in Finnmark and the SW Barents Sea margin.
Research Proposal
Research proposal to the Transition Grant of the University of Tromsø.
Research Proposal
Research proposal to the mobility grant of the Research Council of Norway, April 2018.
Article
Full-text available
The SW Barents Sea margin experienced a pulse of extensional deformation in the Middle–Late Devonian through the Carboniferous, after the Caledonian Orogeny terminated. These events marked the initial stages of formation of major offshore basins such as the Hammerfest and Nordkapp basins. We mapped and analyzed three major fault complexes, (i) the...
Article
Full-text available
Well-preserved fault gouge along brittle faults in Paleoproterozoic, volcano-sedimentary rocks of the Raipas Group exposed in the Alta-Kvænangen tectonic window in northern Norway yielded latest Mesoproterozoic (ca. 1050 ± 15 Ma) to mid Neoproterozoic (ca. 825–810 ± 18 Ma) K/Ar ages. Pressure-temperature estimates from microtextural and mineralogy...
Conference Paper
Full-text available
Background The Caledonian Orogeny was followed by a phase of late/post extensional collapse that resulted in the formation of thick, Middle Devonian sedimentary basins preserved onshore western Norway and Spitsbergen in Svalbard (Figure 1) and exhumation of Precambrian basement rocks as core complexes, e.g. the Lofoten Ridge in Lofoten-Vesterålen (...
Research Proposal
Research proposal for a Post-doctoral fellowship to the VISTA grant, January 2018.
Article
Full-text available
The SW Barents Sea margin experienced a pulse of extensional deformation in the Middle-Late Devonian through the Carboniferous, after the Caledonian Orogeny terminated. These events marked the initial stages of formation of major offshore basins such as the Hammerfest and Nordkapp basins. We mapped and analyzed three major fault complexes, i) the M...
Presentation
Full-text available
Presentation
Full-text available
Presentation
Full-text available
Presentation
Video of the presentation "Faults" at the Forsker Grand Prix 2017 - region nord, in Tromsø, Norway.
Poster
Full-text available
The southwesternmost Nordkapp basin accommodated the deposition of thick, Upper Carboniferous evaporites that are significantly thicker than Asselian (early Permian) evaporites. Three minor salt diapirs most likely sourced from the Upper Carboniferous evaporite layer align along an ENE-WSW trending axis that strikes parallel to the N-bounding fault...
Method
This essay deals with the degree of subjectivity involved in the interpretation of seismic data in geoscience, and with associated ethical issues. The essay includes a case study from northern Norway.
Conference Paper
Full-text available
Bjørnøya (Bear Island) is a 178 km 2 large isle emerging in the western Barents Sea about half way between Northern Norway and Spitsbergen. The island appears as a massive block with a coastline of mostly vertical cliffs at least a few tens of meters high.. Above the cliffs, thetopography is predominantly characterized by a large flat plain extendi...
Conference Paper
Full-text available
The bedrock geology of NW Finnmark is dominated by Caledonian thrust nappes that include the Magerøy Nappe and the Kalak Nappe Complex, and Precambrian basement rocks exposed in tectonic windows. Recent K/Ar radiometric age dating of onshore brittle fault gouge in NW Finnmark, adjacent to the offshore Finnmark Platform, suggests a long-term and com...
Conference Paper
Full-text available
This study is part of the onshore-offshore correlation project that aims at getting a better link between onshore and offshore post-Caledonian brittle structures on the SW Barents Sea Margin, and more specifically in the western part of Troms and Finnmark and the coastal onshore areas adjacent to the Finnmark Platform. Our focus is to explore the t...
Conference Paper
Full-text available
The present study focuses on the onshore-offshore correlation of brittle faults along the SW Barents Sea Margin, northern Norway. Several studies indicate that the SW Barents Sea Margin experienced a pulse of extensional deformation in the Late Devonian?-early Carboniferous, shortly after the Caledonian contractional deformation ended. The formatio...
Conference Paper
Full-text available
The present study focuses on the onshore-offshore correlation of brittle faults along the SW Barents Sea Margin, northern Norway. Several studies indicate that the SW Barents Sea Margin experienced a pulse of extensional deformation in the Late Devonian?-early Carboniferous, shortly after the Caledonian contractional deformation ended. The formatio...
Conference Paper
Full-text available
The Billefjorden Trough is a N-S to NNW-SSE trending rift basin that developed in the Carboniferous during the early stages of the NorthEast Atlantic rifting. The basin displays an asymmetric, half-graben geometry with major down to the East displacements along the N-S trending, right-stepping fault segments of the Billefjorden Fault Zone (BFZ). Th...