Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard
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; up...
Published in: | Solid Earth |
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Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
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European Geosciences Union
2021
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Subjects: | |
Online Access: | https://hdl.handle.net/10037/21542 https://doi.org/10.5194/se-12-1025-2021 |
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ftunivtroemsoe:oai:munin.uit.no:10037/21542 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Koehl, Jean-Baptiste P. Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
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 the Wood Bay and/or Wijde Bay and/or Grey Hoek formations; of the Billefjorden Group; and of the Wordiekammen Formation, respectively. The study shows that these structures partially decoupled uppermost Devonian–Permian sedimentary rocks of the Billefjorden and Gipsdalen groups from Lower Devonian to lowermost Upper Devonian rocks of the Andrée Land Group and Mimerdalen Subgroup during early Cenozoic Eurekan deformation in central Spitsbergen. Eurekan strain decoupling along these structures explains differential deformation between Lower Devonian to lowermost Upper Devonian rocks of the Andrée Land Group and/or Mimerdalen Subgroup and overlying uppermost Devonian–Permian sedimentary strata of the Billefjorden and Gipsdalen groups in central–northern Spitsbergen without requiring an episode of (Ellesmerian) contraction in the Late Devonian. Potential formation mechanisms for bedding-parallel décollements and thrusts include shortcut faulting and/or formation as a roof décollement in a fault-bend hanging wall (or ramp) anticline, as an imbricate fan, as an antiformal thrust stack, and/or as fault-propagation folds over reactivated or overprinted basement-seated faults. The interpretation of seismic data in Reindalspasset indicates that Devonian sedimentary rocks of the Andrée Land Group and Mimerdalen Subgroup might be preserved east of the Billefjorden Fault Zone, suggesting that the Billefjorden Fault Zone did not accommodate reverse movement in the Late Devonian. Hence, the thrusting of Proterozoic basement rocks over Lower Devonian sedimentary rocks along the Balliolbreen Fault and fold structures within strata of the Andrée Land Group and Mimerdalen Subgroup in central Spitsbergen may be explained by a combination of down-east Carboniferous normal faulting with associated footwall rotation and exhumation, and subsequent top-west early Cenozoic Eurekan thrusting along the Billefjorden Fault Zone. Finally, the study shows that major east-dipping faults, like the Billefjorden Fault Zone, may consist of several discrete, unconnected (soft-linked and/or stepping) or, most probably, offset fault segments that were reactivated or overprinted to varying degrees during Eurekan deformation due to strain partitioning and/or decoupling along sub-orthogonal NNE-dipping reverse faults. |
format |
Article in Journal/Newspaper |
author |
Koehl, Jean-Baptiste P. |
author_facet |
Koehl, Jean-Baptiste P. |
author_sort |
Koehl, Jean-Baptiste P. |
title |
Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard |
title_short |
Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard |
title_full |
Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard |
title_fullStr |
Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard |
title_full_unstemmed |
Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard |
title_sort |
early cenozoic eurekan strain partitioning and decoupling in central spitsbergen, svalbard |
publisher |
European Geosciences Union |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/21542 https://doi.org/10.5194/se-12-1025-2021 |
long_lat |
ENVELOPE(-65.050,-65.050,-66.000,-66.000) ENVELOPE(16.417,16.417,78.563,78.563) ENVELOPE(-61.500,-61.500,-64.516,-64.516) ENVELOPE(165.500,165.500,-74.217,-74.217) ENVELOPE(16.877,16.877,78.505,78.505) ENVELOPE(16.277,16.277,78.647,78.647) ENVELOPE(16.756,16.756,78.697,78.697) ENVELOPE(16.973,16.973,78.056,78.056) ENVELOPE(16.267,16.267,78.783,78.783) |
geographic |
Svalbard Hoek Billefjorden Andrée Wood Bay Gipsdalen Mimerdalen Wordiekammen Reindalspasset Balliolbreen |
geographic_facet |
Svalbard Hoek Billefjorden Andrée Wood Bay Gipsdalen Mimerdalen Wordiekammen Reindalspasset Balliolbreen |
genre |
Andrée-Land Arctic Billefjorden Svalbard Spitsbergen |
genre_facet |
Andrée-Land Arctic Billefjorden Svalbard Spitsbergen |
op_relation |
Solid Earth (SE) info:eu-repo/grantAgreement/RCN/PETROSENTR/228107/Norway/Research Centre for Arctic Petroleum Exploration/ARCEx/ info:eu-repo/grantAgreement/RCN/FRINATEK/287865/Norway/Tectonic Stress Effects on Arctic Methane Seepage/SEAMSTRESS/ info:eu-repo/grantAgreement/RCN/SFF/223272/Norway/Centre for Earth Evolution and Dynamics/CEED/ Koehl J-B. Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard. Solid Earth (SE). 2021;12(5):1025-1049 FRIDAID 1912429 doi:10.5194/se-12-1025-2021 1869-9510 1869-9529 https://hdl.handle.net/10037/21542 |
op_rights |
openAccess Copyright 2021 The Author(s) |
op_doi |
https://doi.org/10.5194/se-12-1025-2021 |
container_title |
Solid Earth |
container_volume |
12 |
container_issue |
5 |
container_start_page |
1025 |
op_container_end_page |
1049 |
_version_ |
1766385980029272064 |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/21542 2023-05-15T13:25:33+02:00 Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard Koehl, Jean-Baptiste P. 2021-05-10 https://hdl.handle.net/10037/21542 https://doi.org/10.5194/se-12-1025-2021 eng eng European Geosciences Union Solid Earth (SE) info:eu-repo/grantAgreement/RCN/PETROSENTR/228107/Norway/Research Centre for Arctic Petroleum Exploration/ARCEx/ info:eu-repo/grantAgreement/RCN/FRINATEK/287865/Norway/Tectonic Stress Effects on Arctic Methane Seepage/SEAMSTRESS/ info:eu-repo/grantAgreement/RCN/SFF/223272/Norway/Centre for Earth Evolution and Dynamics/CEED/ Koehl J-B. Early Cenozoic Eurekan strain partitioning and decoupling in central Spitsbergen, Svalbard. Solid Earth (SE). 2021;12(5):1025-1049 FRIDAID 1912429 doi:10.5194/se-12-1025-2021 1869-9510 1869-9529 https://hdl.handle.net/10037/21542 openAccess Copyright 2021 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2021 ftunivtroemsoe https://doi.org/10.5194/se-12-1025-2021 2021-06-25T17:58:12Z 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 the Wood Bay and/or Wijde Bay and/or Grey Hoek formations; of the Billefjorden Group; and of the Wordiekammen Formation, respectively. The study shows that these structures partially decoupled uppermost Devonian–Permian sedimentary rocks of the Billefjorden and Gipsdalen groups from Lower Devonian to lowermost Upper Devonian rocks of the Andrée Land Group and Mimerdalen Subgroup during early Cenozoic Eurekan deformation in central Spitsbergen. Eurekan strain decoupling along these structures explains differential deformation between Lower Devonian to lowermost Upper Devonian rocks of the Andrée Land Group and/or Mimerdalen Subgroup and overlying uppermost Devonian–Permian sedimentary strata of the Billefjorden and Gipsdalen groups in central–northern Spitsbergen without requiring an episode of (Ellesmerian) contraction in the Late Devonian. Potential formation mechanisms for bedding-parallel décollements and thrusts include shortcut faulting and/or formation as a roof décollement in a fault-bend hanging wall (or ramp) anticline, as an imbricate fan, as an antiformal thrust stack, and/or as fault-propagation folds over reactivated or overprinted basement-seated faults. The interpretation of seismic data in Reindalspasset indicates that Devonian sedimentary rocks of the Andrée Land Group and Mimerdalen Subgroup might be preserved east of the Billefjorden Fault Zone, suggesting that the Billefjorden Fault Zone did not accommodate reverse movement in the Late Devonian. Hence, the thrusting of Proterozoic basement rocks over Lower Devonian sedimentary rocks along the Balliolbreen Fault and fold structures within strata of the Andrée Land Group and Mimerdalen Subgroup in central Spitsbergen may be explained by a combination of down-east Carboniferous normal faulting with associated footwall rotation and exhumation, and subsequent top-west early Cenozoic Eurekan thrusting along the Billefjorden Fault Zone. Finally, the study shows that major east-dipping faults, like the Billefjorden Fault Zone, may consist of several discrete, unconnected (soft-linked and/or stepping) or, most probably, offset fault segments that were reactivated or overprinted to varying degrees during Eurekan deformation due to strain partitioning and/or decoupling along sub-orthogonal NNE-dipping reverse faults. Article in Journal/Newspaper Andrée-Land Arctic Billefjorden Svalbard Spitsbergen University of Tromsø: Munin Open Research Archive Svalbard Hoek ENVELOPE(-65.050,-65.050,-66.000,-66.000) Billefjorden ENVELOPE(16.417,16.417,78.563,78.563) Andrée ENVELOPE(-61.500,-61.500,-64.516,-64.516) Wood Bay ENVELOPE(165.500,165.500,-74.217,-74.217) Gipsdalen ENVELOPE(16.877,16.877,78.505,78.505) Mimerdalen ENVELOPE(16.277,16.277,78.647,78.647) Wordiekammen ENVELOPE(16.756,16.756,78.697,78.697) Reindalspasset ENVELOPE(16.973,16.973,78.056,78.056) Balliolbreen ENVELOPE(16.267,16.267,78.783,78.783) Solid Earth 12 5 1025 1049 |