Toggle Main Menu Toggle Search

Open Access padlockePrints

Systematic spacing and topological variations in layer bound fault systems

Lookup NU author(s): Dr Mark Ireland, Professor Richard Davies

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Abstract

Polygonal fault systems, sometimes termed layer-bound faults, are extraordinary features of many fine-grained sedimentary successions and have been described in a significant number of sedimentary basins over the last two decades. Their formation represents an important mechanism by which fine-grained sediments compact often resulting in a variety of complex patterns for which several controlling factors have been proposed. Here three-dimensional seismic data from the North West Shelf of Australia are used to interpret previously undescribed characteristics of layer-bound fault systems where systematic horst and graben structures are the dominant structural style. Conjugate fault pairs, which form the horsts and grabens, frequently have a systematic spacing with graben bounding faults exhibiting a spacing of half that of the horst bounding faults. This systematic spacing of fault pairs indicates, 1) the presence of a mechanically weaker layer at the base of the fault system and 2) that the horizontal shortening required by the volume loss due to compaction can be accommodated without reaching saturation with respect to fault intensity. Furthermore, topological analysis indicates that areas with different patterns also have different intersection and branch characteristics, and these differences suggest that the growth of layer-bound faults is not explained by a single model. The findings have implications for the genesis and growth of layer-bound fault systems and the potential for cross stratal fluid flow.


Publication metadata

Author(s): Ireland MT, Morley C, Davies RJ

Publication type: Article

Publication status: Published

Journal: Basin Research

Year: 2021

Pages: epub ahead of print

Online publication date: 09/07/2021

Acceptance date: 02/04/2018

ISSN (print): 0950-091X

ISSN (electronic): 1365-2117

Publisher: Wiley

URL: https://doi.org/10.1111/bre.12582

DOI: 10.1111/bre.12582


Altmetrics

Altmetrics provided by Altmetric


Actions

Find at Newcastle University icon    Link to this publication


Share