High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites
Mu, Xinan (穆西南)2; Kershaw, Steve1; Li, Yue (李越)3; Guo, Li4; Qi, Yuping (祁玉平)3; Reynolds, Alan5
2009-11-02
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号36期号:6页码:434-441
摘要

High-resolution delta C-13(CARB) analysis of the Permian-Triassic boundary (PTB) interval at the Laolongdong section, Beibei, near the city of Chongqing, south China, encompasses the latest Permian and earliest Triassic major facies changes in the South China Block (SCB). Microbialites form a distinctive unit in the lowermost 190 cm above the top of the Changhsing Formation (latest Permian) at Laolongdong, comparable to a range of earliest Triassic sites in low latitudes in the Tethyan area. The data show that declining values of delta C-13(CARB), well-known globally, began at the base of the microbialite. High positive values (+3 to 4 ppt) of delta C-13(CARB) in the Late Permian are interpreted to indicate storage of C-12 in the deep waters of a stratified ocean, that was released during ocean overturn in the earliest Triassic, contributing to the distinctive fall in isotope values; this interpretation has been stated by other authors and is followed here. The delta C-13(CARB) Curve shows fluctuations within the microbialite unit, which are not reflected in the microbialite structure. Comparisons between microbialite branches and adjacent micritic sediment show little difference in delta C-13(CARB), demonstrating that the microbialite grew in equilibrium with surrounding seawater. The Early Triassic microbialites are interpreted to be a response to upwelling of bicarbonate-rich poorly oxygenated water in low latitudes of Tethys Ocean, consistent with current ocean models for the PTB interval. However, the decline of delta C-13(CARB) may be due to a combination of processes, including productivity collapse resulting from mass extinction, return of deep water to ocean surface, oxidation of methane released from methane hydrate destabilisation, and atmospheric deterioration. Nevertheless, build-up of bicarbonate-rich anoxic deep waters may be expected as a result of the partial isolation of Tethys, due to continental geography; release of bicarbonate-rich deep water, by ocean upwelling, in the earliest Triassic may have been an inevitable consequence of this combination of circumstances. (C) 2007 Elsevier Ltd. All rights reserved.

关键词Permian-triassic Boundary Microbialite Anoxia Tethys Ocean Carbon Isotopes
DOI10.1016/j.jseaes.2007.08.004
语种英语
关键词[WOS]Mass Extinction ; Paleoenvironmental Significance ; Biotic Crisis ; Stratigraphy ; Recovery ; Climate ; Turkey ; Iran
资助项目NNSF[40572069] ; CAS ; LPS
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000271356400004
项目资助者NNSF ; CAS ; LPS
出版者PERGAMON-ELSEVIER SCIENCE LTD
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/240
专题中国科学院南京地质古生物研究所
其他
通讯作者Kershaw, Steve
作者单位1.Brunel Univ, Inst Environm, Uxbridge UB8 3PH, Middx, England
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
3.Chinese Acad Sci, Lab Micropalaeontol, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
4.Univ Cambridge, Dept Earth Sci, CASP, Cambridge CB3 0DH, England
5.Brunel Univ, Expt Tech Ctr, Uxbridge UB8 3PH, Middx, England
第一作者单位中国科学院南京地质古生物研究所
推荐引用方式
GB/T 7714
Mu, Xinan ,Kershaw, Steve,Li, Yue ,et al. High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites[J]. JOURNAL OF ASIAN EARTH SCIENCES,2009,36(6):434-441.
APA Mu, Xinan ,Kershaw, Steve,Li, Yue ,Guo, Li,Qi, Yuping ,&Reynolds, Alan.(2009).High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites.JOURNAL OF ASIAN EARTH SCIENCES,36(6),434-441.
MLA Mu, Xinan ,et al."High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites".JOURNAL OF ASIAN EARTH SCIENCES 36.6(2009):434-441.
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