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    南海天然气水合物分解的碳同位素证据

    王淑红 颜文 陈忠 陈木宏 宋海斌

    王淑红, 颜文, 陈忠, 陈木宏, 宋海斌, 2010. 南海天然气水合物分解的碳同位素证据. 地球科学, 35(4): 526-532. doi: 10.3799/dqkx.2010.068
    引用本文: 王淑红, 颜文, 陈忠, 陈木宏, 宋海斌, 2010. 南海天然气水合物分解的碳同位素证据. 地球科学, 35(4): 526-532. doi: 10.3799/dqkx.2010.068
    WANG Shu-hong, YAN Wen, CHEN Zhong, CHEN Mu-hong, SONG Hai-bin, 2010. Carbon Isotope Evidence of Gas Hydrate Dissociation in South China Sea. Earth Science, 35(4): 526-532. doi: 10.3799/dqkx.2010.068
    Citation: WANG Shu-hong, YAN Wen, CHEN Zhong, CHEN Mu-hong, SONG Hai-bin, 2010. Carbon Isotope Evidence of Gas Hydrate Dissociation in South China Sea. Earth Science, 35(4): 526-532. doi: 10.3799/dqkx.2010.068

    南海天然气水合物分解的碳同位素证据

    doi: 10.3799/dqkx.2010.068
    基金项目: 

    国家自然科学基金 40676043

    国家自然科学基金 40706022

    中国科学院边缘海地质重点实验室基金 MSGL0703

    国家自然科学基金-广东联合基金 U0733003

    中国科学院知识创新工程重要方向项目 KZCX2-YW-211

    详细信息
      作者简介:

      王淑红, 女(1977-), 副研究员, 海洋地质学专业, 从事海洋天然气水合物研究.E-mail: wshhsbq@scsio.ac.cn

    • 中图分类号: P618.13

    Carbon Isotope Evidence of Gas Hydrate Dissociation in South China Sea

    • 摘要: 通过南海南部NS93-5和NS97-37两个柱状沉积物的高分辨率碳、氧同位素分析发现, 末次冰消期(约18 ka)和倒数第二次冰消期(约130 ka)记录到了碳同位素的快速负偏移现象, 与此同时, 氧同位素也发生了明显的快速负偏移, 气温快速回升, 并在氧同位素5期与6期过渡中点(约129.84 ka)出现粉红色红拟抱球虫灭绝现象, 而且两柱样碳、氧同位素的变化趋势与Vostok冰心记录到的大气甲烷含量的变化基本一致.分析认为, 南海记录到的最近2个冰期结束时的碳同位素快速负偏移很可能与天然气水合物的分解释放有关, 即外界温压条件的变化可能导致了南海和/或其他地区海底天然气水合物的失稳分解并释放甲烷, 从而使气候快速变暖、导致海洋缺氧和某些生物种类的灭绝, 同时也加快了冰期的终止.

       

    • 图  1  NS93-5柱和NS97-37柱取样站位

      Fig.  1.  Cores NS93-5 and NS97-37 sampling position

      图  2  NS93-5及NS97-37柱样碳、氧同位素组成及其与其他资料(Prokopenko and Williams, 2004)的对比

      Fig.  2.  Carbon and oxygen isotope composition of cores NS93-5 and NS97-37 and the comparison with other data

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    • 收稿日期:  2009-10-15
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