Seafloor expression and shallow structure of a fold-and-thrust system, Isfjorden, west Spitsbergen

Polar research

Rolf Mjelde¹  Maria Blinova²  Jan Inge Faleide³  Roy H. Gabrielsen³ 

[1] Department of Earth Science, University of Bergen Allégaten 41Bergen, NO-5007 Norway;Department of Earth Science, University of Bergen Allégaten 41Bergen, NO-5007 Norway Correspondence;Department of Geosciences, University of Oslo P.O. Box 1047Blindern NO-0316 Oslo Norway

关键词: Svalbard;    Isfjorden;    west Spitsbergen fold-and-thrust belt;    seismic interpretation;    seafloor morphology;    shallow structures;   

DOI  :  10.3402/polar.v31i0.11209

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

A detailed map of the structure of the west Spitsbergen fold-and-thrust belt in the Isfjorden area, Spitsbergen, is presented. The map was constructed from a dense grid of two-dimensional multichannel reflection seismic and bathymetric data. Joint interpretation of two data sets allowed a comparison of tectonic structures detected along the uppermost parts of the seismic sections and those reflected in the morphology of the seafloor. Three major, predominantly north-west–south-east striking faults were identified. The westernmost fault (T1) is a hinterland-directed (most likely out of sequence) thrust, while the central and easternmost faults (T2 and T3) are foreland-directed (in-sequence thrusts). 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 ch...

【 授权许可】

CC BY-NC