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    南海东沙海域末次冰期异常沉积事件与水合物分解

    陈芳 庄畅 张光学 陆红锋 段虓 周洋 苏新 吴聪 刘广虎

    陈芳, 庄畅, 张光学, 陆红锋, 段虓, 周洋, 苏新, 吴聪, 刘广虎, 2014. 南海东沙海域末次冰期异常沉积事件与水合物分解. 地球科学, 39(11): 1517-1526. doi: 10.3799/dqkx.2014.144
    引用本文: 陈芳, 庄畅, 张光学, 陆红锋, 段虓, 周洋, 苏新, 吴聪, 刘广虎, 2014. 南海东沙海域末次冰期异常沉积事件与水合物分解. 地球科学, 39(11): 1517-1526. doi: 10.3799/dqkx.2014.144
    Chen Fang, Zhuang Chang, Zhang Guangxue, Lu Hongfeng, Duan Xiao, Zhou Yang, Su Xin, Wu Cong, Liu Guanghu, 2014. Abnormal Sedimentary Events and Gas Hydrate Dissociation in Dongsha Area of the South China Sea during Last Glacial Period. Earth Science, 39(11): 1517-1526. doi: 10.3799/dqkx.2014.144
    Citation: Chen Fang, Zhuang Chang, Zhang Guangxue, Lu Hongfeng, Duan Xiao, Zhou Yang, Su Xin, Wu Cong, Liu Guanghu, 2014. Abnormal Sedimentary Events and Gas Hydrate Dissociation in Dongsha Area of the South China Sea during Last Glacial Period. Earth Science, 39(11): 1517-1526. doi: 10.3799/dqkx.2014.144

    南海东沙海域末次冰期异常沉积事件与水合物分解

    doi: 10.3799/dqkx.2014.144
    基金项目: 

    国家自然科学基金项目 41372012

    国家重点基础发展研究规划项目 2009CB219502

    国家专项项目课题 GZH2011003050602

    详细信息
      作者简介:

      陈芳(1966-), 女, 教授级高级工程师, 主要从事微体古生物学和水合物研究.E-mail: zhchenfang66@21cn.com

    • 中图分类号: P67

    Abnormal Sedimentary Events and Gas Hydrate Dissociation in Dongsha Area of the South China Sea during Last Glacial Period

    • 摘要: 对南海东沙海域陆坡区973-3柱状样开展沉积学和年代学、有孔虫同位素和壳体B/Ca比值、碳酸钙和黄铁矿含量的分析, 发现该岩芯浮游有孔虫Globigerinoides ruber和底栖有孔虫Uvigerina peregrinaδ13C在末次冰期同时在多个层位发生负偏, 最大负偏达-2.03‰; 有孔虫δ13C负偏层位环境[CO32-]浓度相对偏低; 负偏层位同时出现大量黄铁矿, 最高含量达17%.在负偏层位以下沉积的碳酸盐溶解作用强烈, CaCO3含量最低, 沉积物颜色偏深.究其成因与水合物分解关系较大.甲烷渗漏事件发生在末次冰期, 说明末次冰期的海平面下降是水合物分解的主要诱因.根据有孔虫δ13C负偏的次数和程度推断至少发生过4次甲烷渗漏, 渗漏的强度基本相当.

       

    • 图  1  东沙海域研究站位位置

      Fig.  1.  Location of studied piston core in Dongsha area

      图  2  973-3柱状样岩性与沉积特征

      Fig.  2.  Lithology and sedimentary features of 973-3PC

      图  3  973-3柱状样地层划分

      Fig.  3.  Stratigraphic division of 973-3PC

      图  4  973-3柱状样浮游有孔虫G.ruber和底栖有孔虫U.peregrina碳同位素特征

      Fig.  4.  Planktonic and benthic foraminifera carbon isotope records of 973-3PC

      图  7  973-3柱状样异常沉积事件与水合物的分解过程示意

      Fig.  7.  Abnormal sedimentary events and gas hydrates dissociation process from 973-3PC

      图  5  973-3柱状样粗组分含量变化曲线与组成(显微镜照片)

      Fig.  5.  Coarse fraction content (%) and its components (micro-photos) of 973-3PC

      图  6  973-3柱状样黄铁矿含量变化及其显微镜照片

      Fig.  6.  Content of pyrite of 973-3PC

      图  8  973-3柱状样990cm处褐红色粗组分XRD成分分析结果

      Fig.  8.  The XRD component analysis of coarse fraction from 973-3PC(990cm)

      图  9  973-3柱状样有孔虫δ13C负偏层位(690~695cm,770~775cm)的壳体扫描电镜照片

      Fig.  9.  SEM images of foraminifera U. peregrina (a) and G. ruber (b, c, d) which δ13C depletion

      表  1  973-3柱状样AMS14C测年结果

      Table  1.   AMS14C dating results of 973-3PC

      样品深度(cm) 样品性质 δ13C(‰) 14C测试结果(aBP) δ13C同位素分馏校正 14C校正年代(aBP, 1σ)
      50~55 G.ruber+G.sacculifer 2.01 3335±45 3781±45 4138±48
      100~105 G.ruber+G.sacculifer 1.38 4415±40 4850±40 5600±17
      226~231 G.ruber+G.sacculifer 2.28 10270±80 10721±80 12773±63
      239~243 G.ruber+G.sacculifer 2.11 12230±60 12678±60 14976±134
      274~279 G.ruber+G.sacculifer -1.97 26850±180 27229±180 27229±180
      282~285 G.ruber+G.sacculifer 1.66 26370±200 26810±200 26810±200
      400~405 G.ruber+G.sacculifer 2.04 38520±310 38967±310 38967±310
      500~505 G.ruber+G.sacculifer 0.44 40960±340 41379±340 41379±340
      600~605 G.ruber+G.sacculifer -1.30 29520±190 29910±190 29910±190
      700~705 G.ruber+G.sacculifer -0.84 42210±360 42608±360 42608±360
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