Relationships between carbon isotope evolution and variation of microbes during the Permian–Triassic transition at Meishan Section, South China

被引:0
|
作者
Genming Luo
Junhuang Huang
Shucheng Xie
Paul B. Wignall
Xinyan Tang
Xianyu Huang
Hongfu Yin
机构
[1] China University of Geosciences,Key Laboratory of Biogeology and Environmental Geology of Ministry of Education
[2] China University of Geosciences,State Key Laboratory of Geological Processes and Mineral Resources
[3] University of Leeds,School of Earth and Environment
来源
International Journal of Earth Sciences | 2010年 / 99卷
关键词
Mass extinction; Global carbon cycle; Organism evolution; Δ; C; Permian/Triassic; South China;
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中图分类号
学科分类号
摘要
This paper investigates kerogen carbon isotopes, the difference between carbonate and kerogen carbon isotopes (Δ13Ccarb-kero = δ13Ccarb − δ13Ckero) and the difference between carbonate and n-C19 alkane compound-specific carbon isotopes (Δ13Ccarb-n-C19 = δ13Ccarb − δ13Cn-C19) during the Permian–Triassic transition at Meishan, South China. The results show that kerogen carbon isotopes underwent both gradual and sharp shifts in beds 23–25 and 26–29, respectively. The differences between carbonate and organic carbon isotopes, both the Δ13Ccarb-kero and Δ13Ccarb-n-C19, which are mainly affected by CO2-fixing enzyme and pCO2, oscillated frequently during the Permian–Triassic transition. Both the variations of Δ13Ccarb-n-C19 and Δ13Ccarb-kero coupled with the alternation between cyanobacteria and green sulfur bacteria indicated by biomarkers. The episodic low values of Δ13Ccarb-n-C19 corresponded to episodic blooms of green sulfur bacteria, while the episodic high values of Δ13Ccarb-n-C19 corresponded to episodic blooms of cyanobacteria. The relationships between the variation of carbon isotopes and biota show that the microbes which flourished after the extinction of macroorganism affected the carbon isotope fractionation greatly. Combining the carbon isotope compositions and the pattern of size variation of the conodont Neogondolella, this paper supposes that anoxia of the photic zone at bed 24 was episodic and it would be caused by the degradation of terrigenous organic matters by sulfate reducing bacteria in the upper water column. Considered together with results from previous research, the high resolution variation of the biogeochemistry presents the sequence of the important geo-events during the Permian–Triassic crisis.
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页码:775 / 784
页数:9
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