Supra-salt normal fault growth during the rise and fall of a diapir: perspectives from 3D seismic reflection data, Norwegian North Sea

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Title: Supra-salt normal fault growth during the rise and fall of a diapir: perspectives from 3D seismic reflection data, Norwegian North Sea
Author(s): Tvedt, ABM
Rotevatn, A
Jackson, CA-L
Item Type: Journal Article
Abstract: Normal faulting and the deep subsurface flow of salt are key processes controlling the structural development of many salt-bearing sedimentary basins. However, our detailed understanding of the spatial and temporal relationship between normal faulting and salt movement is poor due to a lack of natural examples constraining their geometric and kinematic relationship in three-dimensions. To improve our understanding of these processes we here use 3D seismic reflection and borehole data from the Egersund Basin, offshore Norway to determine the structure and growth of a normal fault array formed during the birth, growth and decay of an array of salt structures. We show that the fault array and salt structures developed in response to; (i) Late Triassic-to-Middle Jurassic extension, which involved thick-skinned, sub-salt and thin-skinned supra-salt faulting, with the latter driving reactive diapirism; (ii) Early Cretaceous extensional collapse of the walls; and (iii) Jurassic-to-Neogene, active and passive diapirism, which was at least partly coeval with and occurred along-strike from areas of reactive diapirism and wall collapse. Our study supports physical model predictions, showcasing a three-dimensional example of how protracted, multiphase salt diapirism can influence the structure and growth of normal fault arrays.
Editor(s): Alsop, I
Publication Date: 7-Aug-2016
Date of Acceptance: 1-Aug-2016
ISSN: 1873-1201
Publisher: Elsevier
Start Page: 1
End Page: 26
Journal / Book Title: Journal of Structural Geology
Volume: 91
Copyright Statement: © 2016, Elsevier Ltd. All rights reserved.This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Keywords: 0403 Geology
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering

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