Soft-sediment deformation structures interpreted as seismite from the Middle Permian of the southern Sydney Basin, southeastern Australia

Shi, Guang Rong, Du, Y. S. and Gong, Y. M. 2007, Soft-sediment deformation structures interpreted as seismite from the Middle Permian of the southern Sydney Basin, southeastern Australia, Australian journal of earth sciences, vol. 54, no. 6, pp. 861-874, doi: 10.1080/08120090701392721.

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Title Soft-sediment deformation structures interpreted as seismite from the Middle Permian of the southern Sydney Basin, southeastern Australia
Author(s) Shi, Guang RongORCID iD for Shi, Guang Rong orcid.org/0000-0002-5126-4036
Du, Y. S.
Gong, Y. M.
Journal name Australian journal of earth sciences
Volume number 54
Issue number 6
Start page 861
End page 874
Publisher Taylor and Francis Ltd
Place of publication Carlton South, Vic.
Publication date 2007-08
ISSN 0812-0099
1440-0952
Keyword(s) Australia
Permian
seismite
soft-sediment deformation structures
Sydney Basin
Wandranwandian siltstone
Summary The Middle Permian Wandrawandian Siltstone of the southern Sydney Basin is well exposed along the coastline from Lagoon Head in the south to North Head in the north near Ulladulla in southern New South Wales. The unit is dominated by fossiliferous siltstone and mudstone, with abundant dropstones and minor pebbly sandstone interbeds, and contains an interval of well-preserved and extensive soft-sediment deformation structures. These deformation structures occur mainly in the middle part of the cliff sections and are bounded above and below by undeformed sedimentary units of similar lithology. A wide range of soft-sediment deformation structures have been observed, including cracks, sandstone and sandy mudstone dykes, a possible sand volcano, networks of relatively small and closely connected fissure-like structures, metre-scale complex-type slump folds, flexural stratification, concave-up depressional structures, small-scale normal faults (with displacements usually <1 m), shear planes, and breccias (pseudonodules). The slumps and associated deformations are here collectively interpreted as representing a seismite deposit attributable to penecontemporaneous deformation of soft, hydroplastic sediment layers following a liquefaction triggered by seismic shocks. The timing of the inferred earthquake events appears to correspond to the onset of a major basin-wide tectonism during the Middle Permian.
Language eng
DOI 10.1080/08120090701392721
Field of Research 040308 Palaeontology (incl Palynology)
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Taylor & Francis
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007357

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