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Earthquake-controlled event deposits and its tectonic significance from the Middle Permian Wandrawandian Siltstone in the Sydney Basin, Australia

Du, Yuansheng, Shi, Guang Rong and Gong, Yiming 2005, Earthquake-controlled event deposits and its tectonic significance from the Middle Permian Wandrawandian Siltstone in the Sydney Basin, Australia, Science in China. Series D: earth sciences, vol. 48, no. 9, pp. 1337-1346, doi: 10.1360/02YD0202.

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Title Earthquake-controlled event deposits and its tectonic significance from the Middle Permian Wandrawandian Siltstone in the Sydney Basin, Australia
Author(s) Du, Yuansheng
Shi, Guang RongORCID iD for Shi, Guang Rong orcid.org/0000-0002-5126-4036
Gong, Yiming
Journal name Science in China. Series D: earth sciences
Volume number 48
Issue number 9
Start page 1337
End page 1346
Publisher Springer-Verlag GmbH
Place of publication Heidelberg, Germany
Publication date 2005
ISSN 1006-9313
1862-2801
Keyword(s) Permian
seismites
earthquake
tectonics
Sydney Basin
Australia
Summary The Sydney-Bowen basin in eastern Australia is an elongate back arc-converted foreland basin system situated between the Lachlan Fold Belt in the west and the New England Fold Belt in the east. 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 and minor pebbly sandstone beds. Two general types of deposits are recognized from the siltstone unit in view of the timing and mechanism of formation. One is represented by the primary deposits from offshore to subtidal environments with abundant dropstones of glacial marine origin. The second type is distinguished by secondary, soft-sediment deformational deposits and structures, and comprises three layers of mudstone dykes of seismic origin. In the latter type, metre scale, laterally extensive syn-depositional slump deformation structures occur in the middle part of the Wandrawandian Siltstone. The deformation structures vary in morphol-ogy and pattern, including large-scale complex-type folds, flexural stratification, concave-up structures, faulting of small displacements accompanied by folding and brecciation. The slumps and associated syn-sedimentary structures are attributed to penecontemporaneous deformations of soft sediments (mostly silty mud) formed as a result of mass movement of unconsolidated and/or semi-consolidated substrate following an earthquake event. The occurrence of the earthquake event deposits 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.
Language eng
DOI 10.1360/02YD0202
Field of Research 040310 Sedimentology
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2005, Science in China Press
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008909

Document type: Journal Article
Collections: School of Ecology and Environment
Centre for Integrative Ecology
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