Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea
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...
Published in: | Solid Earth |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2018
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Online Access: | http://hdl.handle.net/10852/64811 http://urn.nb.no/URN:NBN:no-67347 |
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openpolar |
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Open Polar |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
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language |
English |
description |
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 Måsøy Fault Complex, (ii) the Rolvsøya fault, and (iii) the Troms–Finnmark Fault Complex. We discuss the formation of the Måsøy Fault Complex as a possible extensional splay of an overall NE–SW-trending, NW-dipping, basement-seated Caledonian shear zone, the Sørøya–Ingøya shear zone, which was partly inverted during the collapse of the Caledonides and accommodated top–NW normal displacement in Middle to Late Devonian–Carboniferous times. The Troms–Finnmark Fault Complex displays a zigzag-shaped pattern of NNE–SSW- and ENE–WSW-trending extensional faults before it terminates to the north as a WNW–ESE-trending, NE-dipping normal fault that separates the southwesternmost Nordkapp basin in the northeast from the western Finnmark Platform and the Gjesvær Low in the southwest. The WNW–ESE-trending, margin-oblique segment of the Troms–Finnmark Fault Complex is considered to represent the offshore prolongation of a major Neoproterozoic fault complex, the Trollfjorden–Komagelva Fault Zone, which is made of WNW–ESE-trending, subvertical faults that crop out on the island of Magerøya in NW Finnmark. Our results suggest that the Trollfjorden–Komagelva Fault Zone dies out to the northwest before reaching the western Finnmark Platform. We propose an alternative model for the origin of the WNW–ESE-trending segment of the Troms–Finnmark Fault Complex as a possible hard-linked, accommodation cross fault that developed along the Sørøy–Ingøya shear zone. This brittle fault decoupled the western Finnmark Platform from the southwesternmost Nordkapp basin and merged with the Måsøy Fault Complex in Carboniferous times. Seismic data over the Gjesvær Low and southwesternmost Nordkapp basin show that the low-gravity anomaly observed in these areas may result from the presence of Middle to Upper Devonian sedimentary units resembling those in Middle Devonian, spoon-shaped, late- to post-orogenic collapse basins in western and mid-Norway. We propose a model for the formation of the southwesternmost Nordkapp basin and its counterpart Devonian basin in the Gjesvær Low by exhumation of narrow, ENE–WSW- to NE–SW-trending basement ridges along a bowed portion of the Sørøya-Ingøya shear zone in the Middle to Late Devonian–early Carboniferous. Exhumation may have involved part of a large-scale metamorphic core complex that potentially included the Lofoten Ridge, the West Troms Basement Complex and the Norsel High. Finally, we argue that the Sørøya–Ingøya shear zone truncated and decapitated the Trollfjorden–Komagelva Fault Zone during the Caledonian Orogeny and that the western continuation of the Trollfjorden–Komagelva Fault Zone was mostly eroded and potentially partly preserved in basement highs in the SW Barents Sea. |
format |
Article in Journal/Newspaper |
author |
Koehl, Jean-Baptiste Bergh, Steffen G Henningsen, Tormod Faleide, Jan Inge |
spellingShingle |
Koehl, Jean-Baptiste Bergh, Steffen G Henningsen, Tormod Faleide, Jan Inge Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea |
author_facet |
Koehl, Jean-Baptiste Bergh, Steffen G Henningsen, Tormod Faleide, Jan Inge |
author_sort |
Koehl, Jean-Baptiste |
title |
Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea |
title_short |
Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea |
title_full |
Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea |
title_fullStr |
Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea |
title_full_unstemmed |
Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea |
title_sort |
middle to late devonian–carboniferous collapse basins on the finnmark platform and in the southwesternmost nordkapp basin, sw barents sea |
publishDate |
2018 |
url |
http://hdl.handle.net/10852/64811 http://urn.nb.no/URN:NBN:no-67347 |
long_lat |
ENVELOPE(7.942,7.942,63.352,63.352) ENVELOPE(-64.099,-64.099,-64.759,-64.759) ENVELOPE(13.933,13.933,67.417,67.417) ENVELOPE(24.661,24.661,70.997,70.997) ENVELOPE(30.528,30.528,70.241,70.241) ENVELOPE(24.009,24.009,70.968,70.968) |
geographic |
Barents Sea Lofoten Norway Sørøya Norsel Sørøy Måsøy Komagelva Rolvsøya |
geographic_facet |
Barents Sea Lofoten Norway Sørøya Norsel Sørøy Måsøy Komagelva Rolvsøya |
genre |
Barents Sea Finnmark Hammerfest Ingøya Lofoten Magerøya Måsøy Nordkapp Nordkapp Basin Rolvsøya Sørøya Finnmark Troms |
genre_facet |
Barents Sea Finnmark Hammerfest Ingøya Lofoten Magerøya Måsøy Nordkapp Nordkapp Basin Rolvsøya Sørøya Finnmark Troms |
op_source |
1869-9510 |
op_relation |
http://urn.nb.no/URN:NBN:no-67347 Koehl, Jean-Baptiste Bergh, Steffen G Henningsen, Tormod Faleide, Jan Inge . Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea. Solid Earth. 2018, 9, 341-372 http://hdl.handle.net/10852/64811 1577998 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Solid Earth&rft.volume=9&rft.spage=341&rft.date=2018 Solid Earth 9 341 372 doi.org/10.5194/se-9-341-2018 URN:NBN:no-67347 Fulltext https://www.duo.uio.no/bitstream/handle/10852/64811/1/Koehl%2Bet%2Bal.%2B2018.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/se-9-341-2018 |
container_title |
Solid Earth |
container_volume |
9 |
container_issue |
2 |
container_start_page |
341 |
op_container_end_page |
372 |
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1766370185996926976 |
spelling |
ftoslouniv:oai:www.duo.uio.no:10852/64811 2023-05-15T15:38:49+02:00 Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea Koehl, Jean-Baptiste Bergh, Steffen G Henningsen, Tormod Faleide, Jan Inge 2018-04-06T15:19:17Z http://hdl.handle.net/10852/64811 http://urn.nb.no/URN:NBN:no-67347 EN eng http://urn.nb.no/URN:NBN:no-67347 Koehl, Jean-Baptiste Bergh, Steffen G Henningsen, Tormod Faleide, Jan Inge . Middle to Late Devonian–Carboniferous collapse basins on the Finnmark Platform and in the southwesternmost Nordkapp basin, SW Barents Sea. Solid Earth. 2018, 9, 341-372 http://hdl.handle.net/10852/64811 1577998 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Solid Earth&rft.volume=9&rft.spage=341&rft.date=2018 Solid Earth 9 341 372 doi.org/10.5194/se-9-341-2018 URN:NBN:no-67347 Fulltext https://www.duo.uio.no/bitstream/handle/10852/64811/1/Koehl%2Bet%2Bal.%2B2018.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 1869-9510 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2018 ftoslouniv https://doi.org/10.5194/se-9-341-2018 2020-06-21T08:51:56Z 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 Måsøy Fault Complex, (ii) the Rolvsøya fault, and (iii) the Troms–Finnmark Fault Complex. We discuss the formation of the Måsøy Fault Complex as a possible extensional splay of an overall NE–SW-trending, NW-dipping, basement-seated Caledonian shear zone, the Sørøya–Ingøya shear zone, which was partly inverted during the collapse of the Caledonides and accommodated top–NW normal displacement in Middle to Late Devonian–Carboniferous times. The Troms–Finnmark Fault Complex displays a zigzag-shaped pattern of NNE–SSW- and ENE–WSW-trending extensional faults before it terminates to the north as a WNW–ESE-trending, NE-dipping normal fault that separates the southwesternmost Nordkapp basin in the northeast from the western Finnmark Platform and the Gjesvær Low in the southwest. The WNW–ESE-trending, margin-oblique segment of the Troms–Finnmark Fault Complex is considered to represent the offshore prolongation of a major Neoproterozoic fault complex, the Trollfjorden–Komagelva Fault Zone, which is made of WNW–ESE-trending, subvertical faults that crop out on the island of Magerøya in NW Finnmark. Our results suggest that the Trollfjorden–Komagelva Fault Zone dies out to the northwest before reaching the western Finnmark Platform. We propose an alternative model for the origin of the WNW–ESE-trending segment of the Troms–Finnmark Fault Complex as a possible hard-linked, accommodation cross fault that developed along the Sørøy–Ingøya shear zone. This brittle fault decoupled the western Finnmark Platform from the southwesternmost Nordkapp basin and merged with the Måsøy Fault Complex in Carboniferous times. Seismic data over the Gjesvær Low and southwesternmost Nordkapp basin show that the low-gravity anomaly observed in these areas may result from the presence of Middle to Upper Devonian sedimentary units resembling those in Middle Devonian, spoon-shaped, late- to post-orogenic collapse basins in western and mid-Norway. We propose a model for the formation of the southwesternmost Nordkapp basin and its counterpart Devonian basin in the Gjesvær Low by exhumation of narrow, ENE–WSW- to NE–SW-trending basement ridges along a bowed portion of the Sørøya-Ingøya shear zone in the Middle to Late Devonian–early Carboniferous. Exhumation may have involved part of a large-scale metamorphic core complex that potentially included the Lofoten Ridge, the West Troms Basement Complex and the Norsel High. Finally, we argue that the Sørøya–Ingøya shear zone truncated and decapitated the Trollfjorden–Komagelva Fault Zone during the Caledonian Orogeny and that the western continuation of the Trollfjorden–Komagelva Fault Zone was mostly eroded and potentially partly preserved in basement highs in the SW Barents Sea. Article in Journal/Newspaper Barents Sea Finnmark Hammerfest Ingøya Lofoten Magerøya Måsøy Nordkapp Nordkapp Basin Rolvsøya Sørøya Finnmark Troms Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Barents Sea Lofoten Norway Sørøya ENVELOPE(7.942,7.942,63.352,63.352) Norsel ENVELOPE(-64.099,-64.099,-64.759,-64.759) Sørøy ENVELOPE(13.933,13.933,67.417,67.417) Måsøy ENVELOPE(24.661,24.661,70.997,70.997) Komagelva ENVELOPE(30.528,30.528,70.241,70.241) Rolvsøya ENVELOPE(24.009,24.009,70.968,70.968) Solid Earth 9 2 341 372 |