| 东沙海域浅层沉积物硫化物分布特征及其与天然气水合物的关系 |
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| 引用本文： | 刘坚,陆红锋,廖志良,陈道华,程思海.东沙海域浅层沉积物硫化物分布特征及其与天然气水合物的关系[J].地学前缘,2005,12(3):258-262. |
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| 作者姓名： | 刘坚 陆红锋 廖志良 陈道华 程思海 |
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| 作者单位： | 广州海洋地质调查局,广东,广州,510760;广州海洋地质调查局,广东,广州,510760;广州海洋地质调查局,广东,广州,510760;广州海洋地质调查局,广东,广州,510760;广州海洋地质调查局,广东,广州,510760 |
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| 基金项目： | 中国地质调查局研究项目 |
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| 摘 要： | 对南海东沙海域浅层沉积物中硫化物的含量进行了分析,结果表明,沉积物中硫化物的含量与沉积物顶空气甲烷含量有密切的关系,在存在顶空气甲烷高异常的沉积物岩心中,沉积物中硫化物含量明显高于无甲烷异常的沉积物岩心,且随层位深度的增加,其含量明显增大,存在显著的变化梯度带。碎屑矿物鉴定结果表明,沉积物中硫化物主要以黄铁矿的形式存在。浅层沉积物中高含量的硫化物与天然气水合物分解形成的甲烷流有直接的关系,反映了下部沉积物中可能存在天然气水合物。
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| 关 键 词： | 东沙海域 浅层沉积物 硫化物 天然气水合物 |
| 文章编号： | 1005-2321（2005）03-0258-05 |
| 收稿时间： | 2005-06-10 |
| 修稿时间： | 2005-07-27 |
Distribution of sulfides in shallow sediments in Dongsha area, South China Sea,and its relationship to gas hydrates |
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| LIU Jian,LU Hong-feng,LIAO Zhi-liang,CHEN Dao-hua,CHENG Si-hai.Distribution of sulfides in shallow sediments in Dongsha area, South China Sea,and its relationship to gas hydrates[J].Earth Science Frontiers,2005,12(3):258-262. |
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| Authors: | LIU Jian LU Hong-feng LIAO Zhi-liang CHEN Dao-hua CHENG Si-hai |
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| Institution: | Guangzhou Marine Geological Survey ,Guangzhou 510760,China |
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| Abstract: | Analyses of sulfides present in shallow sediments in Dongsha area in South China Sea, show that the sulfides content varies as a function of headspace methane in sediments: the higher headspace methane content, the more sulfides.The sulfides increase downwards with a distinct gradient. These sulfides are mainly pyrite. The sulfides in sediments of Dongsha area were probably formed by the methane-rich fluids, which originated from the decomposition of underlying gas hydrate. As a result, the anomalous content of sulfides in these sediments is evidence of the presence of gas hydrates. |
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| Keywords: | Dongsha area South China Sea shallow sediments sulfides gas hydrates |
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