The development of a Triassic fold-thrust belt in a synclinal depositional system, Bowen Basin (eastern Australia)

Babaahmadi, Abbas, Sliwa, Renate, Esterle, Joan and Rosenbaum, Gideon (2017) The development of a Triassic fold-thrust belt in a synclinal depositional system, Bowen Basin (eastern Australia). Tectonics, 36 1: 51-77. doi:10.1002/2016TC004297

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Author Babaahmadi, Abbas
Sliwa, Renate
Esterle, Joan
Rosenbaum, Gideon
Title The development of a Triassic fold-thrust belt in a synclinal depositional system, Bowen Basin (eastern Australia)
Journal name Tectonics   Check publisher's open access policy
ISSN 0278-7407
Publication date 2017-01-18
Year available 2016
Sub-type Article (original research)
DOI 10.1002/2016TC004297
Open Access Status File (Publisher version)
Volume 36
Issue 1
Start page 51
End page 77
Total pages 27
Place of publication Hoboken, NJ United States
Publisher Wiley-Blackwell Publishing
Language eng
Subject 1908 Geophysics
1906 Geochemistry and Petrology
Abstract A synclinal depositional system in eastern Australia (Taroom Trough, Bowen Basin) was affected by folds and thrusts, but the structural style associated with this deformation is not fully understood. Using gridded aeromagnetic data and 2D seismic reflection data, we conducted a structural analysis that unravels the geometry and kinematics of major thrust faults in the eastern-central part of the Taroom Trough. Major structures are the east-dipping Cockatoo, Miles and Taroom faults, and west-dipping Burunga and Glebe faults. Our results show that west-dipping thrusts have a listric geometry that produced gentle hanging-wall anticlines. A north-striking gentle symmetric syncline and anticline pair is also observed to the west of the Burunga Fault. These observations indicate that the deformation in the central Taroom Trough was controlled by décollements in the basement rocks. The décollements and resultant structures were likely developed in response to mild contraction of the synclinal depositional system during the last phase of the Permian-Triassic Hunter-Bowen Orogeny (HBO). The last phase of the HBO also resulted in the reactivation of pre-existing east-dipping Cockatoo and Miles faults. The bulk longitudinal strain, however, in the eastern-central Bowen Basin was low (~2.8% shortening), with the deformation restricted to a relatively narrow zone. In contrast, deformation in the northern Bowen Basin was distributed in a wider fold-thrust belt that accommodated a higher amount of strain. This change in the pattern of deformation along the eastern part of the Bowen Basin could possibly be explained by along-strike variations in the rates of trench advance.
Keyword Geochemistry & Geophysics
Geochemistry & Geophysics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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Created: Thu, 22 Dec 2016, 21:14:10 EST by Dr Gideon Rosenbaum on behalf of School of Earth Sciences