| Stable isotopic geochemistry of organic carbon and pyrite sulfur from the Early Cambrian black shales in Northwestern Hunan, China |
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| 引用本文： | CAO Shuanglin 1,2 *,MA Dongsheng 1 and PAN Jiayong 1(1. State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China, 2. East China Institute of Technology,Fuzhou 344000,China). Stable isotopic geochemistry of organic carbon and pyrite sulfur from the Early Cambrian black shales in Northwestern Hunan, China[J]. 自然科学进展(英文版), 2004, 14(2). DOI: 10.1080/10020070412331343331 |
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| 作者姓名： | CAO Shuanglin 1 2 * MA Dongsheng 1 and PAN Jiayong 1(1. State Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China 2. East China Institute of Technology Fuzhou 344000 China) |
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| 作者单位： | 1. State Key Laboratory for Mineral Deposits Research，Department of Earth Sciences，Nanjing University，Nanjing 210093，China; 2. East China Institute of Technology，Fuzhou 344000，China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，南京大学校科研和教改项目 |
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| 摘 要： | The early Cambrian black shale sequence in Northwestern Hunan Province has been investigated for its stable isotopic geochemistry of organic carbon and pyrite sulfur. The relatively low δ 13C values of organic matter, -29.7‰～-34.2‰, are interpreted as caused by the high CO2 concentration in atmosphere/ocean and an anoxic depositional environment in early Cambrian. Variable, but significantly positive δ 34S values, 10.2‰～ 28.2‰, for sedimentary pyrite reveals bacterial sulfate reduction as the pyrite-forming process but under sulfate-limited conditions. A protected anoxic basin, which had very limited access to open ocean, and its sediments, where metabolizable organic matter was rich and bioturbation was absent, are supposed to be the sulfate-limited environments and might have existed in South China in the early Cambrian.
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Stable isotopic geochemistry of organic carbon and pyrite sulfur from the Early Cambrian black shales in Northwestern Hunan,China |
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| CAO Shuanglin,MA Dongsheng,PAN Jiayong. Stable isotopic geochemistry of organic carbon and pyrite sulfur from the Early Cambrian black shales in Northwestern Hunan,China[J]. Progress in Natural Science, 2004, 14(2). DOI: 10.1080/10020070412331343331 |
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| Authors: | CAO Shuanglin MA Dongsheng PAN Jiayong |
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| Abstract: | The early Cambrian black shale sequence in Northwestern Hunan Province has been investigated for its stable isotopic geochemistry of organic carbon and pyrite sulfur. The relatively low δ 13C values of organic matter, -29.7‰～-34.2‰, are interpreted as caused by the high CO2 concentration in atmosphere/ocean and an anoxic depositional environment in early Cambrian. Variable, but significantly positive δ 34S values, +10.2‰～+28.2‰, for sedimentary pyrite reveals bacterial sulfate reduction as the pyrite-forming process but under sulfate-limited conditions. A protected anoxic basin, which had very limited access to open ocean, and its sediments, where metabolizable organic matter was rich and bioturbation was absent, are supposed to be the sulfate-limited environments and might have existed in South China in the early Cambrian. |
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| Keywords: | sulfur and carbon isotopes black shales early Cambrian Hunan |
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