End-Permian mass extinction pattern in the northern peri-Gondwanan region

Shen, Shu Zhong, Cao, Chang-Qun, Henderson, Charles M., Wang, Xiang-Dong, Shi, Guang Rong, Wang, Yue and Wang, Wei 2006, End-Permian mass extinction pattern in the northern peri-Gondwanan region, Palaeoworld, vol. 15, no. 1, pp. 3-30, doi: 10.1016/j.palwor.2006.03.005.

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Title End-Permian mass extinction pattern in the northern peri-Gondwanan region
Author(s) Shen, Shu Zhong
Cao, Chang-Qun
Henderson, Charles M.
Wang, Xiang-Dong
Shi, Guang Rong
Wang, Yue
Wang, Wei
Journal name Palaeoworld
Volume number 15
Issue number 1
Start page 3
End page 30
Publisher Elsevier BV
Place of publication Amsterdam, Netherlands
Publication date 2006-01
ISSN 1871-174X
Keyword(s) end-Permian
mass extinction
Peri-Gondwanan region
climatic warming
sea-level changes
Summary The Permian-Triassic extinction pattern in the peri-Gondwanan region is documented biostratigraphically, geochemically and sedimentologically based on three marine sequences deposited in southern Tibet and comparisons with the sections in the Salt Range, Pakistan and Kashmir. Results of biostratigraphical ranges for the marine faunas reveal an end-Permian event comparable in timing with that known at the Meishan section in low palaeolatitude as well as Spitsbergen and East Greenland in northern Boreal settings although biotic patterns earlier in the Permian vary. The previously interpreted delayed extinction (Late Griesbachian) at the Selong Xishan section is not supported by our analysis. The end-Permian event exhibits an abrupt marine faunal shift slightly beneath the Permian-Triassic boundary (PTB) from benthic taxa- to nektic taxa-dominated communities. The climate along the continental margin of Neo-Tethys was cold before the extinction event. However, a rapid climatic warming event as indicated by the southward invasion of abundant warm-water conodonts, warm-water brachiopods, calcareous sponges, and gastropods was associated with the extinction event. Stable isotopic values of δ13Ccarb, δ13Corg and δ18O show a sharp negative drop slightly before and during the extinction interval. Sedimentological and microstratigraphical analysis reveals a Late Permian regression, as marked by a Caliche Bed at the Selong Xishan section and the micaceous siltstone in the topmost part of the Qubuerga Formation at the Qubu and Tulong sections. The regression was immediately followed by a rapid transgression beneath the PTB. The basal Triassic rocks fine upward, and are dominated by dolomitic packstone/wackestone containing pyritic cubes, bioturbation and numerous tiny foraminifers, suggesting that the studied sections were deposited during the initial stage of the transgression and hence may not have been deeply affected by the anoxic event that is widely believed to characterise the zenith of the transgression.
Notes Available online 6 June 2006.
Language eng
DOI 10.1016/j.palwor.2006.03.005
Field of Research 040308 Palaeontology (incl Palynology)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006 Nanjing Institute of Geology and Palaeontology, CAS
Persistent URL http://hdl.handle.net/10536/DRO/DU:30009012

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