Blar i forfatter "Koehl, Jean-Baptiste P."

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    • The Billefjorden Fault Zone north of Spitsbergen: a major terrane boundary? 

      Koehl, Jean-Baptiste P.; Allaart, Lis (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-13)
      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 major, crustal-scale tectonic boundary, its north-ward ...

    • Devonian core complex exhumation and Cenozoic decollements as alternatives to the Ellesmerian Orogeny 

      Koehl, Jean-Baptiste P. (Conference object; Konferansebidrag, 2018-10)
      The Ellesmerian Orogeny (Piepjohn et al., 2000) is a short-lived contractional–transpressional event that occurred in the Late Devonian–Mississippian, i.e., after Devonian collapse of the Caledonides and prior to Carboniferous rifting. Thus far, this episode of contraction–transpression was required to explain the presence of undeformed Carboniferous–Permian sedimentary rocks on top of folded ...

    • Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard 

      Koehl, Jean-Baptiste P. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-10)
      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 Pennsylvanian–lowermost Permian sedimentary strata of ...

    • From widespread Mississippian to localized Pennsylvanian extension in central Spitsbergen, Svalbard 

      Koehl, Jean-Baptiste P.; Muñoz-Barrera, Jhon M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-21)
      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–Mississippian Ellesmerian contraction, and Early–Middle ...

    • Impact of Timanian thrusts on the Phanerozoic tectonic history of Svalbard 

      Koehl, Jean-Baptiste P. (Conference object; Konferansebidrag, 2019-09-13)
      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 hundreds–thousands of kilometers apart and accreted ...

    • Late Devonian–Carboniferous faulting and controlling structures and fabrics in NW Finnmark 

      Koehl, Jean-Baptiste P.; Bergh, Steffen G; Osmundsen, Per Terje; Redfield, Thomas Fitzmaurice; Indrevær, Kjetil; Lea, Halldis; Bergø, Espen (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-10)
      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 systems are present in coastal and onshore areas of NW ...

    • Mississippian rocks and WNW–ESE-striking faults in Spitsbergen 

      Koehl, Jean-Baptiste P. (Conference object; Konferansebidrag, 2019-06-18)

    • Neoproterozoic and post-Caledonian exhumation and shallow faulting in NW Finnmark from K–Ar dating and p/T analysis of fault rocks 

      Koehl, Jean-Baptiste P.; Bergh, Steffen G; Wemmer, Klaus (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-20)
      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 microtextural and mineralogy analyses of fault ...

    • Tectonic evolution of the Indio Hills segment of the San Andreas fault in southern California, southwestern USA 

      Koehl, Jean-Baptiste P.; Bergh, Steffen Gunnar; Sylvester, Arthur G. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-01)
      Transpressional uplift domains of inverted Pliocene–Pleistocene basin fill along the San Andreas fault zone in Coachella Valley, southern California (USA), are characterized by fault linkage and segmentation and deformation partitioning. The Indio Hills wedge-shaped uplift block is located in between two boundary fault strands, the Indio Hills fault to the northeast and the main San Andreas fault ...

    • WNW-ESE-striking Timanian faults in Svalbard 

      Koehl, Jean-Baptiste P. (Conference object; Konferansebidrag, 2019-10)