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Soft-sediment deformation structures in the middle permian Wandrawandian siltstone, southern Sydney basin: implications for depositional environment and basin tectonics

Shi, G. R. and Du, Yuan-sheng 2003, Soft-sediment deformation structures in the middle permian Wandrawandian siltstone, southern Sydney basin: implications for depositional environment and basin tectonics, in Proceedings of the thirty fifth Symposium on Advances in the study of the Sydney Basin, September 29-30, 2003, Wollongong NSW, School of Geosciences, University of Wollongong, Wollongong, N.S.W., pp. 307-314.

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Title Soft-sediment deformation structures in the middle permian Wandrawandian siltstone, southern Sydney basin: implications for depositional environment and basin tectonics
Author(s) Shi, G. R.ORCID iD for Shi, G. R. orcid.org/0000-0002-5126-4036
Du, Yuan-sheng
Conference name Advances in the study of the Sydney Basin. Symposium (35th : 2003 : Wollongong, N.S.W.)
Conference location Wollongong, N.S.W.
Conference dates 29-30 September 2003
Title of proceedings Proceedings of the thirty fifth Symposium on Advances in the study of the Sydney Basin, September 29-30, 2003, Wollongong NSW
Editor(s) Hutton, Adrian. C.
Jones, B. G.
Carr, P. F.
Ackerman, B.
Switzer, A. D.
Publication date 2003
Conference series Advances in the study of the Sydney Basin Symposium
Start page 307
End page 314
Total pages 339 p.
Publisher School of Geosciences, University of Wollongong
Place of publication Wollongong, N.S.W.
Keyword(s) Coal
Geology
Sydney Basin
Summary The Middle Permian Wandrawandian Siltstone at Warden Head near Ulladulla in the southern Sydney Basin is dominated by fossiliferous siltstone and mudstone, with a large amount of dropstones (lonestones) and some pebbly sandstone beds. Two general types of deposits are recognised from the cliff succession in view of the timing and mechanism of their formation. One is represented by the background (or primary) deposits of offshore to slope environments with abundant dropstones of glacial marine origin. This facies occurs throughout the cliff sections at Warden Head. The second type is distinguished by secondary, soft-sediment deformational deposits and structures of the primary (background) deposits, and comprises three successive layers of sandy mudstone dikes. In the second type of deposit, metre scale, laterally extensive syn-depositional slump deformation structures occur extensively in the middle part of the Wandrawandian Siltstone. The deformation structures vary in morphology and pattern, including large-scale complex-type folds, flexural stratification, concave-up structures, small-magnitude -faults accompanied by folding and brecciation. The slumps and associated syn-depositional structures are herein attributed to penecontemporaneous deformations of soft sediments (mostly mud and silty mud), formed as a result of mass movement of unconsolidated and/or semi-consolidated substrate following earthquake events. The occurrence of the earthquake event deposits (or seismites) at Warden Head supports the current view that the Sydney Basin was located in a back-arc setting near the New England magmatic arc on an active continental margin during the Middle Permian, and the timing of the earthquake events is here interpreted to indicate the onset of the Hunter Bowen Orogeny in the southern Sydney Basin.
Language eng
Field of Research 040308 Palaeontology (incl Palynology)
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category E1 Full written paper - refereed
Copyright notice ©2003, School of Geosciences, University of Wollongong
Persistent URL http://hdl.handle.net/10536/DRO/DU:30005193

Document type: Conference Paper
Collections: School of Ecology and Environment
Centre for Integrative Ecology
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