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Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen

Bergen Open Research Archive

Show simple item record Blinova, Maria eng Faleide, Jan Inge eng Gabrielsen, Roy H. eng Mjelde, Rolf eng 2012-06-26T12:13:07Z 2012-06-26T12:13:07Z 2012 eng
dc.identifier.citation Polar Research 31(11209)
dc.identifier.issn 1751-8369 eng
dc.description Published with the title: Seafloor expression and shallow structure of a fold-and-thrust system, Isfjorden, west Spitsbergen
dc.description.abstract 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. en
dc.language.iso eng eng
dc.publisher Norwegian Polar Institute eng
dc.relation.ispartof <a href="" target="blank">Seismic study along the west Spitsbergen continental margin and adjacent area of the West Spitsbergen Fold and Thrust Belt (Isfjorden)</a> eng
dc.rights Attribution-NonCommercial CC BY-NC eng
dc.rights.uri eng
dc.title Seafloor expression and shallow structure of a surfacing fold-and-thrust system: an example from Isfjorden, West Spitsbergen eng
dc.type Journal article eng
dc.type Peer reviewed eng
dc.subject.nsi VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 eng
dc.rights.holder Copyright 2012 M. Blinova et al.
dc.type.version acceptedVersion eng
bora.peerreviewed Peer reviewed eng
bora.journalTitle Polar Research eng
bibo.volume 31 eng
bibo.issue 11209 eng
bibo.doi eng

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