浙江煤山P/T之交碳同位素对有机碳埋藏的指示意义

黄俊华; 罗根明; 白晓; 汤新燕

浙江煤山P/T之交碳同位素对有机碳埋藏的指示意义

黄俊华^{1, 2,},
罗根明^{1, 2},
白晓¹,
汤新燕¹

1.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
2.
中国地质大学生物地质与环境地质教育部重点实验室, 湖北武汉 430074

基金项目:

中国石油化工股份有限公司海相油气勘探前瞻性项目 G0800-06-ZS-319

详细信息

作者简介:
黄俊华(1964-), 男, 高工, 主要从事同位素地球化学、第四纪与环境研究.E-mail: jhhuang@cug.edu.cn

中图分类号: P736
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出版历程
- 收稿日期: 2007-08-25
- 刊出日期: 2007-11-25

The Organic Fraction of the Total Carbon Burial Flux Deduced from Carbon Isotopes across the Permo-Triassic Boundary at Meishan, Zhejiang Province

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 of Ministry of Education, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 根据碳酸盐碳同位素和有机(干酪根) 碳同位素记录, 结合碳循环模式, 计算得到了浙江煤山全球二叠系-三叠系界线层型剖面第23-40层的有机碳埋藏分数f_org.在第23-24层和第27-29层下部出现f_org的两个高峰值, 与绿硫细菌反映的两个缺氧环境条件相对应.在第25-26层和第32-34层出现两个f_org低谷值, 与2-甲基藿烷指示的两次蓝细菌繁盛(第26层和第29层上部到第34层) 基本吻合.这些结果反映了f_org与埋藏时的氧化还原条件密切相关.f_org与总有机碳含量TOC的关系比较复杂, 一些TOC较高的层位(如第26层) f_org却较低, 而一些TOC较低的层位(如第27层) f_org却较高, 反映了原始生产力对TOC的重要贡献.根据原始生产力和f_org得到的原始有机埋藏量, 可以校正现今测得的残余TOC.本次研究结果说明, 同步有机-无机碳同位素分析, 在建立一定碳循环模型的基础上, 计算有机碳埋藏分数, 可有效指示有机质埋藏状态, 进而为建立生物-环境-有机碳埋藏的耦合关系模型提供基础.
- 碳同位素 /
- 碳循环 /
- 有机碳埋藏 /
- 二叠系-三叠系界线
Abstract: By combining the carbon cycle model with the records of carbonate and organic (kerogen) carbon isotope composition, this paper presents the calculation of the fraction of organic carbon burial (f_org) of beds 23-40 at the 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-melthyhopanes. It appears that the f_org is related to the redox conditions, with greater f_org values observed at 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 high TOC content (such as bed 26), whilst high f_org values observed at some beds with 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 in modern time. 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.
- carbon isotope /
- carbon cycle /
- organic burial /
- Permian-Triassic boundary

HTML全文

图 1 煤山B剖面δ¹³C_org、δ¹³C_carb、f_org及TOC随时间变化曲线(年代据Bowring et al., 1998)

CB.蓝细菌繁盛; GSB.绿硫细菌繁盛

Fig. 1. The variation trends of δ¹³C_org, δ¹³C_carb and TOC at Meishan Section B

下载: 全尺寸图片幻灯片

图 2 煤山B剖面δ¹³C_org随剖面深度变化曲线

Fig. 2. The δ¹³C_org variation with depth at Meishan Section B

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图 3 Kump and Arthur (1999)提出的碳同位素循环模式

Fig. 3. The carbon cycle model proposed by Kump and Arthur (1999)

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表 1 煤山B剖面样品δ¹³C_org及δ¹³C_carb分析结果

Table 1. The δ¹³C_org and the δ¹³C_carb data of the samples analyzed at Meishan section B

表 2 一些层位的有机碳埋藏分数f_org、原始生产力P和总有机碳含量TOC

Table 2. The fraction of the organic carbon burial (f_org), the primary production (P) and the TOC content in some beds in Meishan section B

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