Major and trace element composition of surface sediments from the Southwest Indian Ridge: evidence for the incorporation of a hydrothermal component

LI Zhenggang CHU Fengyou JIN Lu LI Xiaohu DONG Yanhui CHEN Ling ZHU Jihao

李正刚, 初凤友, 金路, 李小虎, 董彦辉, 陈灵, 朱继浩. 西南印度洋中脊表层沉积物中存在热液组分的地球化学证据[J]. 海洋学报英文版, 2016, 35(2): 101-108. doi: 10.1007/s13131-015-0678-8
引用本文: 李正刚, 初凤友, 金路, 李小虎, 董彦辉, 陈灵, 朱继浩. 西南印度洋中脊表层沉积物中存在热液组分的地球化学证据[J]. 海洋学报英文版, 2016, 35(2): 101-108. doi: 10.1007/s13131-015-0678-8
LI Zhenggang, CHU Fengyou, JIN Lu, LI Xiaohu, DONG Yanhui, CHEN Ling, ZHU Jihao. Major and trace element composition of surface sediments from the Southwest Indian Ridge: evidence for the incorporation of a hydrothermal component[J]. Acta Oceanologica Sinica, 2016, 35(2): 101-108. doi: 10.1007/s13131-015-0678-8
Citation: LI Zhenggang, CHU Fengyou, JIN Lu, LI Xiaohu, DONG Yanhui, CHEN Ling, ZHU Jihao. Major and trace element composition of surface sediments from the Southwest Indian Ridge: evidence for the incorporation of a hydrothermal component[J]. Acta Oceanologica Sinica, 2016, 35(2): 101-108. doi: 10.1007/s13131-015-0678-8

西南印度洋中脊表层沉积物中存在热液组分的地球化学证据

doi: 10.1007/s13131-015-0678-8

Major and trace element composition of surface sediments from the Southwest Indian Ridge: evidence for the incorporation of a hydrothermal component

  • 摘要: 深海沉积物中的热液组分能够记录附近的热液活动。本研究对超慢速扩张的西南印度洋中脊表层沉积物进行了主量、微量以及稀土元素分析,检测沉积物中是否有热液组分的存在。表层沉积物均以生物碳酸盐软泥为主,CaO的含量介于85.5%至89.9%之间(去除挥发份后)。经~5%稀盐酸去除沉积物中生物成因的碳酸钙后,其残留物与上地壳具有近似的SiO2、Al2O3、CaO、MgO、碱金属(Rb和Cs)以及高场强元素(Nb、Ta、Zr、Hf和Ti)组成。这些“岩屑元素”并非来源于附近的火山碎屑,而主要来自澳大利亚大陆的风尘砂。此外,该残留物与上地壳相比具有显著的正Eu异常,这与陆源碎屑正好相反。而正Eu异常是海底热液流体以及热液沉淀物的典型特征,再加上残留物具有富集Fe、Mn和Ba的特征,推测沉积物中有热液组分的加入。二元混合计算结果显示残留物中热液组分的贡献超过50%。由于沉积物中并没有观察到热液沉淀物互层的现象,排除了热液组分来自附近垮塌烟囱体的可能,最有可能的解释是低温弥散流的矿化。对于断层和裂隙较为发育的慢速或超慢速扩张脊(如西南印度洋中脊),广泛存在的低温弥散流在洋壳浅部的矿化潜力有可能被严重低估。
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