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引用本文:朱正杰,陈敬安,李航,任世聪,曾艳,李妍均.贵州草海沉积物碳酸盐碳同位素异常正值的发现及其环境指示意义.湖泊科学,2011,23(5):681-685. DOI:10.18307/2011.0503
ZHU Zhengjie,CHEN Jingan,LI Hang,REN Shicong,ZENG Yan,LI Yanjun.Discovery of abnormal positive values of carbon isotope of carbonate sediments from Lake Caohai, Guizhou Province and their implications. J. Lake Sci.2011,23(5):681-685. DOI:10.18307/2011.0503
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贵州草海沉积物碳酸盐碳同位素异常正值的发现及其环境指示意义
朱正杰1,2,3, 陈敬安1, 李航2,3, 任世聪2,3, 曾艳1, 李妍均2,3
1.中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550002;2.重庆地质矿产研究院外生成矿与矿山环境重庆市重点实验室, 重庆 400042;3.煤炭资源与安全开采国家重点实验室重庆研究中心, 重庆 400042
摘要:
对贵州草海沉积物柱芯碳酸盐碳同位素组成测定的结果显示, 其δ13C值的变化范围为-14.25‰至23.10‰, 变化幅度为37.35‰, 这是迄今所发现的湖泊沉积物碳酸盐中最大的碳同位素变化幅度, 其中的部分同位素值也是迄今发现的最大碳同位素值.综合碳酸盐氧同位素、碳酸盐含量和有机质含量指标, 认为草海沉积物碳酸盐碳同位素组成主要反映了湖区水生植物光合/呼吸作用, 异常正值可能指示了湖区细菌参与有机质碳同位素分馏过程的特殊环境/气候条件.因此, 草海沉积物碳酸盐异常正值在今后的研究中值得进一步关注。
关键词:  草海  碳酸盐同位素  异常正值  细菌
DOI:10.18307/2011.0503
分类号:
基金项目:国家科技支撑计划项目(2011BAC02B0201);贵州省科技计划项目联合资助
Discovery of abnormal positive values of carbon isotope of carbonate sediments from Lake Caohai, Guizhou Province and their implications
ZHU Zhengjie1,2,3, CHEN Jingan1, LI Hang2,3, REN Shicong2,3, ZENG Yan1, LI Yanjun2,3
1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, P.R.China;2.Chongqing Key Laboratory of Exogenic Minerallization and Mine Environment, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, P.R.China;3.Chongqing Research Center, State Key Laboratory of Coal Resources and Safe Mining, Chongqing 400042, P.R.China
Abstract:
Carbon isotopes(δ13C) of carbonate from sediment core has been measured in Lake Caohai, Guizhou Province, south-west China.The results showed that δ13C values varied between -14.25‰ and 23.10‰, which was the largest amplitude of car-bon isotope variations and the highest positive values discovered so far in lacusrine carbonate sediments.On the basis of combina-tion with oxygen isotope, organic matter and carbonate content proxies, we suggested that the carbon isotope of carbonate from Lake Caohai was controlled by photosynthesis/respiration of aquatic plants, and the input of bacteria to carbon isotope fractionation of or-ganic matter might be responsible for the abnormal positive δ13C values in Lake Caohai.Therefore, much attention should be paid to the carbonate δ13C in Lake Caohai in the future research.
Key words:  Lake Caohai  carbon isotope  abnormal positive  bacteria
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