Organic fraction of the total carbon burial flux deduced from carbon isotopes across the Permo-Triassic boundary at Meishan,Zhejiang Province,China |
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| Authors: | Huang Junhua Luo Genming Bai Xiao and Tang Xinyan |
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| Institution: | (1) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China;(2) Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China |
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| Abstract: | By combining the carbon cycle model with the records of carbonate and organic (kerogen) carbon isotope, this paper presents
the calculation of the fraction of organic carbon burial (f
org) of beds 23–40 at the global boundary stratotype section and point (GSSP) of the Permian-Triassic boundary at Meishan, Zhejiang
Province. The resulting calculation produces two episodes of f
org maxima observed to occur at beds 23–24 and 27–29, which respectively corresponds to the two episodic anoxic events indicated
by the flourish of green sulfur bacteria. Two episodic f
org minima occurred at beds 25–26 and 32–34, generally coincident with the flourish of cyanobacteria (bed 26 and upper part of
beds 29 to 34) as shown by the high value of 2-melthyhopnoanes. It appears that the f
org is related to the redox conditions, with greater f
org values observed under the reductive condition. The relationship between f
org and the total organic carbon (TOC) content was complex. The f
org value was low at some beds with a high TOC content (such as bed 26), while high observed at some beds with a low TOC content
(e.g. bed 27). This association infers the important contribution of primary productivity to the TOC content. The original
organic burial could be thus calculated through the configuration of the function of the primary productivity and f
org, which can be used to correct the residual TOC measured today. This investigation indicates that compiling the organic-inorganic
carbon isotopes with the carbon cycle model favors to understand the fraction of organic carbon burial, providing information
for the reconstruction of the coupling among biota, environments and organic burial.
Journal of China University of Geosciences, 2007, 32(6): 767–773 译自: 地球科学—中国地质大学学报] |
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| Keywords: | carbon isotope carbon cycle organic burial permian-Triassic boundary |
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