NDLI: Molecular carbon isotope variations in core samples taken at the Permian–Triassic boundary layers in southern China

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Molecular carbon isotope variations in core samples taken at the Permian–Triassic boundary layers in southern China

Content Provider	Springer Nature Link
Author	Wang, Ruiliang Zhang, Shuichang Brassell, Simon Wang, Jiaxue Lu, Zhengyuan Ming, Qingzhong Wang, Xiaomei Bian, Lizeng
Copyright Year	2011
Abstract	Stable carbon isotope composition (δ13C) of carbonate sediments and the molecular (biomarker) characteristics of a continuous Permian–Triassic (PT) layer in southern China were studied to obtain geochemical signals of global change at the Permian–Triassic boundary (PTB). Carbonate carbon isotope values shifted toward positive before the end of the Permian period and then shifted negative above the PTB into the Triassic period. Molecular carbon isotope values of biomarkers followed the same trend at and below the PTB and remained negative in the Triassic layer. These biomarkers were acyclic isoprenoids, ranging from C15 to C40, steranes (C27 dominates) and terpenoids that were all significantly more abundant in samples from the Permian layer than those from the Triassic layer. The Triassic layer was distinguished by the dominance of higher molecular weight (waxy) n-alkanes. Stable carbon isotope values of individual components, including n-alkanes and acyclic isoprenoids such as phytane, isop-C25, and squalane, are depleted in δ13C by up to 8–10‰ in the Triassic samples as compared to the Permian. Measured molecular and isotopic variations of organic matter in the PT layers support the generally accepted view of Permian oceanic stagnation followed by a massive upwelling of toxic deep waters at the PTB. A series of large-scale (global) outgassing events may be associated with the carbon isotope shift we measured. This is also consistent with the lithological evidence we observed of white thin-clay layers in this region. Our findings, in context with a generally accepted stagnant Permian ocean, followed by massive upwelling of toxic deep waters might be the major causes of the largest global mass extinction event that occurred at the Permian–Triassic boundary.
Starting Page	1397
Ending Page	1406
Page Count	10
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	101
Issue Number	5
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-11-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Permian Triassic Southern China PTB Mass extinction, carbon isotope δ13C Upwelling Outgassing Geophysics/Geodesy Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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