日本海西部大陆坡自生碳酸盐的特征与成因

徐兆凯; 崔镇勇; 林东日; 李铁刚; 李安春

doi:10.3724/SP.J.1140.2009.02041

日本海西部大陆坡自生碳酸盐的特征与成因

1 群山国立大学海洋学院, 群山 573-701, 韩国;
2 中国科学院海洋研究所海洋地质与环境重点实验室, 青岛 266071;
3 韩国海洋研究院南海分院, 巨济 656-830, 韩国

基金项目:

国家重点基础研究发展规划项目(2007CB815903)

韩国海洋研究院研究项目(PM50101)

中国科学院知识创新工程重要方向性项目(KZCX2-YW-211)

国家自然科学基金重点项目(90411014)

国家自然科学基金项目(40576032,40506016)

详细信息

作者简介:
徐兆凯(1978-),男,博士后,主要从事海洋地质学研究,E-mail:zhaokaixu@126.com

中图分类号: P736.3
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- 文章访问数: 1680
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出版历程
- 收稿日期: 2008-11-13
- 修回日期: 2008-12-27

CHARACTER AND ORIGIN OF AUTHIGENIC CARBONATES IN THE WESTERN CONTINENTAL SLOPE OF THE EAST JAPAN SEA

1 Department of Oceanography, Kunsan National University, Kunsan 573-701, Korea;
2 Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
3 South Sea Institute, Korea Ocean Research and Development Institute, Geoje 656-830, Korea

摘要

摘要: 对日本海西部大陆坡沉积物柱状样中的自生碳酸盐样品进行了X射线衍射、扫描电镜、地球化学和碳氧同位素组成的系统研究。X射线衍射和扫描电镜分析结果表明,碳酸盐主要组成矿物为颗粒状自生高镁方解石微晶,放射状自生文石微晶仅在一个层位出现。结合碳酸盐的地球化学组成,认为研究区碳酸盐来自于富Ca²⁺、Mg²⁺和HCO₃^-流体的沉淀。中度亏损的¹³C (-33.85‰~-39.53‰)表明碳来自于甲烷的厌氧氧化,同时,这也是研究区海底存在甲烷冷泉的重要证据。重氧同位素比值(5.28‰~5.31‰)则指示着富¹⁸O流体来源,而该流体应源于天然气水合物的分解。综上可知,研究区碳酸盐来自于研究区甲烷冷泉上升流的沉淀,指示着海底更深处天然气水合物的存在与分解。
- 自生碳酸盐 /
- 化学成分 /
- 碳氧同位素 /
- 天然气水合物 /
- 日本海
Abstract: Authigenic carbonates collected from a sediment core on the western continental slope of East Japan Sea have been synthetically studied on X-ray diffraction (XRD), scanning electron microscope (SEM), geochemistry, and carbon and oxygen isotope. The analysis results on XRD and SEM show that carbonate minerals are mainly composed of authigenic high-Mg calcite (HMC) in grain shape, while authigenic elongate aragonite only appears in one layer. Combining the analysis on geochemical composition, we deduce that the studied carbonates come from fluids enriched in Ca²⁺, Mg²⁺, and HCO₃^-. The moderately depleted ¹³C (-33.85‰~-39.53‰) reflects that carbon should be mainly derived from the anaerobic oxidation of methane, which is also an evidence for gas venting in the local seafloor. The heavy ¹⁸O values (5.28‰~5.31‰) should be closely related with ¹⁸O-rich fluids, resulting from the decomposition of gas hydrate. Therefore, the studied carbonates should precipitate from upward cold seep fluids enriched in methane, indicating the occurrence and dissociation of underlying gas hydrate.
- authigenic carbonate /
- mineralogy /
- geochemistry /
- carbon and oxygen isotope /
- gas hydrate

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参考文献(29)

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