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南海北部东沙海域沉积物地球化学特征及其反映的冷泉活动

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文章导航 > 海洋地质前沿 > 2015 > 31(9): 14-27

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张必东, 邬黛黛, 吴能友. 南海北部东沙海域沉积物地球化学特征及其反映的冷泉活动[J]. 海洋地质前沿, 2015, 31(9): 14-27. doi: 10.16028/j.1009-2722.2015.09003
引用本文: 张必东, 邬黛黛, 吴能友. 南海北部东沙海域沉积物地球化学特征及其反映的冷泉活动[J]. 海洋地质前沿, 2015, 31(9): 14-27. doi: 10.16028/j.1009-2722.2015.09003
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ZHANG Bidong, WU Daidai, WU Nengyou. CHARACTERISTICS OF SEDIMENTARY GEOCHEMISTRY AND THEIR RESPONSES TO COLD-SEEP ACTIVITIES IN DONGSHA, THE NORTHERN SOUTH CHINA SEA[J]. Marine Geology Frontiers, 2015, 31(9): 14-27. doi: 10.16028/j.1009-2722.2015.09003
Citation: ZHANG Bidong, WU Daidai, WU Nengyou. CHARACTERISTICS OF SEDIMENTARY GEOCHEMISTRY AND THEIR RESPONSES TO COLD-SEEP ACTIVITIES IN DONGSHA, THE NORTHERN SOUTH CHINA SEA[J]. Marine Geology Frontiers, 2015, 31(9): 14-27. doi: 10.16028/j.1009-2722.2015.09003
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南海北部东沙海域沉积物地球化学特征及其反映的冷泉活动

  • 1 中国科学院天然气水合物重点实验室, 中国科学院广州能源研究所, 广州 510640;

  • 2 中国科学院大学, 北京 100049;

  • 3 中国地质调查局青岛海洋地质研究所, 青岛 266071

  • 基金项目:

    国家海洋地质专项(GHZ2012006003,GZH201400309)

    国家自然科学基金(41273022)

    中国科学院重点部署项目(KGZD-EW-301)

    中国科学院广州能源研究所所长创新基金培育专项(y307p51001)

详细信息
    作者简介: 张必东(1989-),男,硕士,主要从事海洋地质方面的研究工作.E-mail:bdzhang@mail.ustc.edu.cn
    通讯作者: 邬黛黛(1981-),女,博士,副研究员,主要从事海洋地质、地球化学方面的研究工作.E-mail:wudd@ms.giec.ac.cn

  • 中图分类号: P736.21;P591

CHARACTERISTICS OF SEDIMENTARY GEOCHEMISTRY AND THEIR RESPONSES TO COLD-SEEP ACTIVITIES IN DONGSHA, THE NORTHERN SOUTH CHINA SEA

  • 1 Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;

  • 2 University of Chinese Academy of Sciences, Beijing 100049, China;

  • 3 Qingdao Institate of Marine Gedogy, CGS, Qingdao 266071, China

More Information

    摘要
  • 南海北部东沙海域是典型的水合物成藏区,冷泉活动对其沉积物地球化学特征有显著影响。分析了东沙海域冷泉区973-4站位1 375 cm(水深1 666 m)和973-5站位935 cm(水深2 998 m)长的柱状样的总有机碳(TOC)、总硫(TS)含量,并挑选其中的底栖有孔虫进行了碳氧同位素测试。通过沉积物总硫含量分析和临近站位孔隙水数据分析表明,2个站位沉积物均有较浅的硫酸盐甲烷还原界面(SMI)深度和较大的甲烷通量,其中973-4站位硫酸盐甲烷界面深度为海水-沉积物界面以下约900 cm,973-5站位硫酸盐甲烷界面深度为海水-沉积物界面以下约750 cm。总碳/总硫比值表明冷泉流体活动对沉积物硫埋藏起主导作用。Uvigerina spp.的δ13C表明末次盛冰期(LGM)之前东沙海域有持续的冷泉活动,而自末次盛冰期以来Uvigerina spp.的δ13C其偏负程度逐渐变小、冷泉活动逐渐减弱,这可能是海平面上升扩大了天然气水合物稳定区范围,从而抑制了冷泉流体上涌的结果。
    The northern South China Sea is a typical active cold methane seeping area and the seeping fluids certainly have critical impact on the geochemistry of the sediments. Two gravity cores, 1375-cm-long at Site 973-4 (with water depth of 1,666 m) and 935-cm-long at Site 973-5 (with water depth of 2,998 m) respectively, were recovered from cold methane seeps in the Dongsha area. Total carbon and total sulfur analysis, foraminiferal oxygen and carbon isotope tests of the sediment samples at both sites are studied. According to the total sulfur and their porewater data from adjacent sites, it is deduced that the two sites have shallow sulfur methane interface and high methane fluxes. The depth of sulfur methane interface is 900 cm under the sea bottom at Site 973-4 and 750 cm under the sea bottom at Site 973-5. TOC and TS data demonstrate that cold-seep fluids and their AOMs are the controlling factors of the precipitations of pyrites. Oxygen and carbon isotopes compositions of Uvigerina spp. indicate that the activities of cold seeps in Dongsha area has been attenuated since the last glacier maximum and this might be the results of rising global sea level.
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收稿日期:  2015-03-17

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