Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen
Published with the title: Seafloor expression and shallow structure of a fold-and-thrust system, Isfjorden, west Spitsbergen A detailed map of the structure of the West Spitsbergen Fold-and-Thrust Belt in the shallow part of the Isfjorden area, Spitsbergen, is presented. The map was constructed from...
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Norwegian Polar Institute
2012
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Online Access: | https://hdl.handle.net/1956/5862 https://doi.org/10.3402/polar.v31i0.11209 |
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ftunivbergen:oai:bora.uib.no:1956/5862 2023-05-15T16:55:56+02:00 Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen Blinova, Maria Faleide, Jan Inge Gabrielsen, Roy H. Mjelde, Rolf 2012 application/pdf https://hdl.handle.net/1956/5862 https://doi.org/10.3402/polar.v31i0.11209 eng eng Norwegian Polar Institute Seismic study along the west Spitsbergen continental margin and adjacent area of the West Spitsbergen Fold and Thrust Belt (Isfjorden) urn:issn:1751-8369 https://hdl.handle.net/1956/5862 https://doi.org/10.3402/polar.v31i0.11209 cristin:965162 Attribution-NonCommercial CC BY-NC http://creativecommons.org/licenses/by-nc/3.0/ Copyright 2012 M. Blinova et al. Polar Research 31 11209 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Peer reviewed Journal article 2012 ftunivbergen https://doi.org/10.3402/polar.v31i0.11209 2023-03-14T17:42:59Z Published with the title: Seafloor expression and shallow structure of a fold-and-thrust system, Isfjorden, west Spitsbergen A detailed map of the structure of the West Spitsbergen Fold-and-Thrust Belt in the shallow part of the Isfjorden area, Spitsbergen, is presented. The map was constructed from a new dense grid of 2D multichannel reflection seismic and bathymetrical surveys. Interpretation of two different datasets gave a possibility to observe and compare tectonic structures detected along the uppermost part of the seismic sections and those reflected in morphological data at the seafloor. Correlation of the tectonic structures as expressed in the two datasets shows a good match and three major thrust faults were identified. The outcropping thrusts display a dominant NW-SE strike. The westernmost thrust fault (T1) is an out-of-sequence hinterland-directed thrust, whilst the central and easternmost thrust faults (T2 and T3) represent foreland-directed in-sequence thrusting. The thrusts divide Isfjorden into three subareas. Subarea 1 is bounded by thrust faults T1 and T2 and comprises Tertiary rocks surrounded by Jurassic-Cretaceous strata. The structural signature of Subarea 1 is that of a system of hinterland- and foreland-directed thrust faults, resulting in a seafloor relief characterized by parallel ridges and lows. Subarea 2 is limited by thrust faults T2 and T3. It includes an area of Jurassic-Cretaceous strata outcropping on the seafloor. Subarea 3 is situated east of the main thrust fault T3, and mainly incorporates outcrops of Triassic-Jurassic rocks. Together, Subareas 2 and 3 are dominated by foreland-directed thrusting with NW-SE and NNW-SSE strike directions, which are hardly detectable in bathymetric data. acceptedVersion Article in Journal/Newspaper Isfjord* Isfjorden Polar Research Spitsbergen University of Bergen: Bergen Open Research Archive (BORA-UiB) Polar Research 31 1 11209 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Blinova, Maria Faleide, Jan Inge Gabrielsen, Roy H. Mjelde, Rolf Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 |
description |
Published with the title: Seafloor expression and shallow structure of a fold-and-thrust system, Isfjorden, west Spitsbergen A detailed map of the structure of the West Spitsbergen Fold-and-Thrust Belt in the shallow part of the Isfjorden area, Spitsbergen, is presented. The map was constructed from a new dense grid of 2D multichannel reflection seismic and bathymetrical surveys. Interpretation of two different datasets gave a possibility to observe and compare tectonic structures detected along the uppermost part of the seismic sections and those reflected in morphological data at the seafloor. Correlation of the tectonic structures as expressed in the two datasets shows a good match and three major thrust faults were identified. The outcropping thrusts display a dominant NW-SE strike. The westernmost thrust fault (T1) is an out-of-sequence hinterland-directed thrust, whilst the central and easternmost thrust faults (T2 and T3) represent foreland-directed in-sequence thrusting. The thrusts divide Isfjorden into three subareas. Subarea 1 is bounded by thrust faults T1 and T2 and comprises Tertiary rocks surrounded by Jurassic-Cretaceous strata. The structural signature of Subarea 1 is that of a system of hinterland- and foreland-directed thrust faults, resulting in a seafloor relief characterized by parallel ridges and lows. Subarea 2 is limited by thrust faults T2 and T3. It includes an area of Jurassic-Cretaceous strata outcropping on the seafloor. Subarea 3 is situated east of the main thrust fault T3, and mainly incorporates outcrops of Triassic-Jurassic rocks. Together, Subareas 2 and 3 are dominated by foreland-directed thrusting with NW-SE and NNW-SSE strike directions, which are hardly detectable in bathymetric data. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Blinova, Maria Faleide, Jan Inge Gabrielsen, Roy H. Mjelde, Rolf |
author_facet |
Blinova, Maria Faleide, Jan Inge Gabrielsen, Roy H. Mjelde, Rolf |
author_sort |
Blinova, Maria |
title |
Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen |
title_short |
Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen |
title_full |
Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen |
title_fullStr |
Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen |
title_full_unstemmed |
Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen |
title_sort |
seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from isfjorden, west spitsbergen |
publisher |
Norwegian Polar Institute |
publishDate |
2012 |
url |
https://hdl.handle.net/1956/5862 https://doi.org/10.3402/polar.v31i0.11209 |
genre |
Isfjord* Isfjorden Polar Research Spitsbergen |
genre_facet |
Isfjord* Isfjorden Polar Research Spitsbergen |
op_source |
Polar Research 31 11209 |
op_relation |
Seismic study along the west Spitsbergen continental margin and adjacent area of the West Spitsbergen Fold and Thrust Belt (Isfjorden) urn:issn:1751-8369 https://hdl.handle.net/1956/5862 https://doi.org/10.3402/polar.v31i0.11209 cristin:965162 |
op_rights |
Attribution-NonCommercial CC BY-NC http://creativecommons.org/licenses/by-nc/3.0/ Copyright 2012 M. Blinova et al. |
op_doi |
https://doi.org/10.3402/polar.v31i0.11209 |
container_title |
Polar Research |
container_volume |
31 |
container_issue |
1 |
container_start_page |
11209 |
_version_ |
1766046971852750848 |