重大地质转折期的碳、硫循环与环境演变

地学前缘 ›› 2009, Vol. 16 ›› Issue (6): 33-47.

重大地质转折期的碳、硫循环与环境演变

汪建国,陈代钊,严德天

1中国科学院地质与地球物理研究所, 北京 100029
2中国地质大学(武汉) 生物地质与环境地质教育部重点实验室, 湖北武汉 430074

收稿日期:2009-08-01 修回日期:2009-11-08 出版日期:2009-12-16 发布日期:2009-12-10
作者简介:汪建国(1977—),男,博士,主要从事沉积学和沉积地球化学。Email:wangjg@mail.igcas.ac.cn
基金资助:
国家重点基础研究发展计划“973”项目(2005CB422101);国家自然科学基金项目(40673013,40839907)

Variation in carbon and sulphur isotopes and environments during the critical geological transitions.

HONG Jian-Guo, CHEN Dai-Zhao, YAN De-Tian

1Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2Key Laboratory of Education Ministry for Biogeology and Environment Geology, China University of Geosciences(Wuhan), Wuhan 430074, China

Received:2009-08-01 Revised:2009-11-08 Online:2009-12-16 Published:2009-12-10

摘要/Abstract

摘要：

碳、硫在表层储库和地质储库以不同的形式相互转换,在这个过程中都伴随着一定的同位素分馏。碳同位素的分馏主要受到光合作用以及海水溶解无机碳与大气CO2交换的控制,而硫同位素的分馏则主要受控于硫酸盐细菌还原作用。表层储库碳、硫同位素的组成通过地质作用被很好地保存在地质储库中,因此通过对地质储库中碳、硫同位素的分析和研究,可以很好地了解地球各圈层相互作用的规律,重塑地质历史特别是重大关键转折时期的演化过程。同时文中借助一些碳、硫同位素应用实例,进一步加深理解影响碳、硫同位素组成和变化的原因,以提高对不同时期全球环境变化的认知程度。

关键词: 碳、硫循环;同位素分馏;光合作用;细菌硫酸盐还原作用;生物大灭绝

Abstract:

Stable isotopes of carbon and sulphur are fractionated during cycling between surface reservoirs and geological reservoirs. The main processes that control the isotopic composition of various reservoirs are photosynthesis and equilibrium between oceanic dissolved inorganic carbon and atmospheric CO2 for carbon, and bacterial sulphate reduction for sulphur. CS cycling from surface reservoirs and stored in geological reservoirs provides a geological record of ancient isotopic compositions. These isotopic signals can be used to improve and refine our understanding of historical changes in global geochemical cycles through geological time, especially for some key transitional periods. A number of case studies with detailed applications of these principles have been discussed to illustrate the causes and effects of ancient global environmental change.

Key words: Key words: carbon and sulphur cycles; isotope fractionation; photosynthesis; bacterial sulphate reduction; the mass extinction

汪建国陈代钊严德天. 重大地质转折期的碳、硫循环与环境演变[J]. 地学前缘, 2009, 16(6): 33-47.

HONG Jian-Guo, CHEN Dai-Zhao, YAN De-Tian. Variation in carbon and sulphur isotopes and environments during the critical geological transitions.[J]. Earth Science Frontiers, 2009, 16(6): 33-47.