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Lower permian oncolites from South China: implications for equatorial sea-level responses to late palaeozoic Gondwanan glaciation

Shi, Guang Rong and Chen, Zhong-Qiang 2006, Lower permian oncolites from South China: implications for equatorial sea-level responses to late palaeozoic Gondwanan glaciation, Journal of Asian earth sciences, vol. 26, no. 3-4, pp. 424-436, doi: 10.1016/j.jseaes.2005.10.009.

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Title Lower permian oncolites from South China: implications for equatorial sea-level responses to late palaeozoic Gondwanan glaciation
Author(s) Shi, Guang RongORCID iD for Shi, Guang Rong orcid.org/0000-0002-5126-4036
Chen, Zhong-Qiang
Journal name Journal of Asian earth sciences
Volume number 26
Issue number 3-4
Start page 424
End page 436
Publisher Elsevier Science
Place of publication New York, N.Y.
Publication date 2006-03
ISSN 1367-9120
1878-5786
Keyword(s) Gondwanan glaciation
lower Permian
oncoids
oncolite
South China
Summary The oncoid-bearing Chuanshan Formation is a regionally extensive carbonate deposit of predominantly Asselian to early Sakmarian (Early Permian) age in South China, occupying an area of some 500,000 km2. Throughout South China, the oncoid-bearing horizons are generally stable and broadly comparable in lithology, fossil content and the morphology of the oncoid grains. Four types of microfacies are recognized from the oncolite succession and overall they suggest a moderate- to high-energy, wave-agitated shallow marine carbonate platform environment. An analysis of the stratigraphic distribution of oncoid grain size, density, thickness and the bedding structures of the oncolite beds and the number of coating laminae indicate the presence of metre-scale cyclothems, suggestive of possible high-frequency cycles of sea-level fluctuation. Compared to carbonate successions above and below that lack oncolites, and in conjunction with evidence from sequence stratigraphic and isotopic geochemical analyses of coeval carbonate deposits in South China and elsewhere, the origin of the Chuanshan oncolites is linked to a drastic drop in global sea-level at the Pennsylvanian–Permian boundary, that can be correlated closely in timing with the zenith of the Late Palaeozoic Gondwanan glaciation. It is further suggested that the eustatic changes apparent from the deposition of the Chuanshan oncolites and similar coeval deposits in lower palaeolatitudes were coupled with, and influenced by, the contemporaneous high-latitude Gondwanan glaciation, the largest and longest known such event in Phanerozoic Earth history.
Language eng
DOI 10.1016/j.jseaes.2005.10.009
Field of Research 040308 Palaeontology (incl Palynology)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005 Elsevier Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30003759

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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