High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites
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 distin...
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ftchinacscnigpas:oai:ir.nigpas.ac.cn:332004/19390 2023-05-15T17:12:13+02:00 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 Kershaw, Steve Li, Yue Guo, Li Qi, Yuping Reynolds, Alan 2009-11-02 http://ir.nigpas.ac.cn/handle/332004/19390 https://doi.org/10.1016/j.jseaes.2007.08.004 英语 eng PERGAMON-ELSEVIER SCIENCE LTD JOURNAL OF ASIAN EARTH SCIENCES http://ir.nigpas.ac.cn/handle/332004/19390 doi:10.1016/j.jseaes.2007.08.004 Permian-Triassic boundary Microbialite Anoxia Tethys Ocean Carbon isotopes MASS EXTINCTION PALEOENVIRONMENTAL SIGNIFICANCE BIOTIC CRISIS STRATIGRAPHY RECOVERY CLIMATE TURKEY IRAN Geology Geosciences Multidisciplinary 期刊论文 2009 ftchinacscnigpas https://doi.org/10.1016/j.jseaes.2007.08.004 2019-08-14T12:44:16Z 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. Report Methane hydrate Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) Journal of Asian Earth Sciences 36 6 434 441 |
institution |
Open Polar |
collection |
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacscnigpas |
language |
English |
topic |
Permian-Triassic boundary Microbialite Anoxia Tethys Ocean Carbon isotopes MASS EXTINCTION PALEOENVIRONMENTAL SIGNIFICANCE BIOTIC CRISIS STRATIGRAPHY RECOVERY CLIMATE TURKEY IRAN Geology Geosciences Multidisciplinary |
spellingShingle |
Permian-Triassic boundary Microbialite Anoxia Tethys Ocean Carbon isotopes MASS EXTINCTION PALEOENVIRONMENTAL SIGNIFICANCE BIOTIC CRISIS STRATIGRAPHY RECOVERY CLIMATE TURKEY IRAN Geology Geosciences Multidisciplinary Mu, Xinan Kershaw, Steve Li, Yue Guo, Li Qi, Yuping Reynolds, Alan High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites |
topic_facet |
Permian-Triassic boundary Microbialite Anoxia Tethys Ocean Carbon isotopes MASS EXTINCTION PALEOENVIRONMENTAL SIGNIFICANCE BIOTIC CRISIS STRATIGRAPHY RECOVERY CLIMATE TURKEY IRAN Geology Geosciences Multidisciplinary |
description |
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. |
format |
Report |
author |
Mu, Xinan Kershaw, Steve Li, Yue Guo, Li Qi, Yuping Reynolds, Alan |
author_facet |
Mu, Xinan Kershaw, Steve Li, Yue Guo, Li Qi, Yuping Reynolds, Alan |
author_sort |
Mu, Xinan |
title |
High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites |
title_short |
High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites |
title_full |
High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites |
title_fullStr |
High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites |
title_full_unstemmed |
High-resolution carbon isotope changes in the Permian-Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites |
title_sort |
high-resolution carbon isotope changes in the permian-triassic boundary interval, chongqing, south china; implications for control and growth of earliest triassic microbialites |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2009 |
url |
http://ir.nigpas.ac.cn/handle/332004/19390 https://doi.org/10.1016/j.jseaes.2007.08.004 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
JOURNAL OF ASIAN EARTH SCIENCES http://ir.nigpas.ac.cn/handle/332004/19390 doi:10.1016/j.jseaes.2007.08.004 |
op_doi |
https://doi.org/10.1016/j.jseaes.2007.08.004 |
container_title |
Journal of Asian Earth Sciences |
container_volume |
36 |
container_issue |
6 |
container_start_page |
434 |
op_container_end_page |
441 |
_version_ |
1766069015323607040 |