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Chemical compositions of mussels and clams from the Tangyin and Yonaguni Knoll IV hydrothermal fields in the southwestern Okinawa Trough

  • [设施]:“科学”号海洋科学综合考察船
  • [期刊/会议名称]:Ore Geology Reviews
  • [摘要]:Studies of the chemical characteristics of mussels and clams in seafloor hydrothermalfields are important for understanding massfluxes and elemental partitioning from hydrothermal vents into the biosphere, metal bioaccumulation of seafloor hydrothermal ecosystems, and the sources and sinks of biogeochemical andfluid cycles. We are thefirst to measure the mineral, major, trace and rare earth element, and carbon and oxygen isotope compositions of mussels (Bathymodiolus platifrons)andclams(Conchocele bisecta) from the Tangyin and Yonaguni Knoll IV hydrothermalfields in the southwestern Okinawa Trough. Mineralogical analysis shows that the carbonate shells of the mussel and clam samples are mainly composed of calcite and aragonite. Metal elements exhibit linear correlations in the shells (e.g., V and U) and tissues (e.g., Li and Rb) of the mussels and clams, suggesting that not all positive correlations of elements in tissues are inherited by the shells. V/As, Ca/Sr, and Fe/Cr ratios in the mussels and clams are close to those in the seawater, indicating that element ratios of seawater might be inherited by the mussels and clams. In addition, the Fe/Cr ratio of the shells of both mussels and clams can be used to trace the local seawater composition.The total LREE concentrations of mussel and clam tissue samples are higher than those of the mussel and clam shell samples, are similar to the hydrothermalfluids, exhibit LREE enrichment (LaCN/NdCNratios = 1.86-32.1), and no or only slightly negative Eu anomalies, indicating that benthic animals are a sink of LREEs from hydrothermalfluids, and that the Eu/Eu* ratios offluids change whenfluids are incorporated into the tissues of the mussels and clams. In addition, theδ13 C values of mussel shell samples are heavier than those of the clam shell samples in the hydrothermalfield, indicating that more than one carbon source may be involved in defining theδ13 Ccompositions of the shells. The majority of theδ18 O values of clam shell samples fall in the range ofδ18Ovaluesofthemussel shell samples, and are close to the hydrothermalfluidδ18 OH2Ovalues, implying that theδ18Ovaluesof mussel and clam shell carbonate is influenced by the hydrothermal environment (magmatic water andfluid dilution with seawater)
  • [发表日期]:2016
  • [第一作者]:曾志刚
  • [第一作者单位]:中国科学院海洋研究所
  • [通讯作者]:曾志刚
  • [通讯作者单位]:中国科学院海洋研究所
  • [论文类型]:0
  • [期刊分类]:SCI1区
  • [学科分类]:地球科学
  • [影响因子]:4.484
  • [关键词]:Mussel Clam Chemical composition Tangyin and Yonaguni Knoll IV hydrothermal fields
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