Temporal evolution of extensional fault-propagation folds

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Authors

Christopher Aiden-Lee Jackson , Stephen Corfield, Tom Dreyer

Abstract

Integration of three-dimensional seismic and well data from the Upper Jurassic North Sea rift provides insights into the temporal evolution of fault-propagation folds in extensional settings. The hangingwall of the Oseberg fault zone is characterised by an asymmetric, fault-parallel syncline interpreted as the hangingwall portion of a breached monocline which formed in response to an upwardly-propagating normal fault. During the early stage of fault-tip propagation, a growth monocline developed at the depositional surface, resulting in early syn-rift units which thinned and onlapped towards the fault zone. Stratigraphic data from these early syn-rift units suggest that this initial phase of growth folding lasted ca. 19 Myr. Late syn-rift units formed an overall faultward expanding wedge, suggesting it was deposited after monocline breaching and a more typical half-graben basin had established. The results of this study have important implications for the timescale over which fault-propagation folds evolve prior to breaching and the impact of fault-propagation folding on the sequence stratigraphy of syn-rift successions.

DOI

https://doi.org/10.31223/osf.io/v9p8e

Subjects

Earth Sciences, Geology, Physical Sciences and Mathematics, Stratigraphy, Tectonics and Structure

Keywords

Fault propagation, forced folding, normal faulting, North Sea, Fault growth, Upper Jurassic, fault-related folding, North Sea Rift, tectono-stratigraphy

Dates

Published: 2017-11-23 09:29

Last Updated: 2017-12-01 12:07

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License

Academic Free License (AFL) 3.0

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