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Smectite formation in metalliferous sediments near the East Pacific Rise at 13°N

机译:13°N东太平洋上升附近含金属沉积物中的蒙脱石形成

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摘要

A 43 cm long E271 sediment core collected near the East Pacific Rise (EPR) at 13°N were studied to investigate the origin of smectite for understanding better the geochemical behavior of hydrothermal material after deposition. E271 sediments are typical metalliferous sediments. After removal of organic matter, carbonate, biogenic opal, and Fe-Mn oxide by a series of chemical procedures, clay minerals (<2 μm) were investigated by X-ray diffraction, chemical analysis and Si isotope analysis. Due to the influence of seafloor hydrothermal activity and close to continent, the sources of clay minerals are complex. Illite, chlorite and kaolinite are suggested to be transported from either North or Central America by rivers or winds, but smectite is authigenic. It is enriched in iron, and its contents are highest in clay minerals. Data show that smectite is most likely formed by the reaction of hydrothermal Fe-oxyhydroxide with silica and seawater in metalliferous sediments. The Si that participates in this reaction may be derived from siliceous microfossils (diatoms or radiolarians), hydrothermal fluids, or detrital mineral phases. And theirδ30Si values are higher than those of authigenic smectites, which implies that a Si isotope fractionation occurs during the formation because of the selective absorption of light Si isotopes onto Fe-oxyhydroxides. Sm/Fe mass ratios (a proxy for overall REE/Fe ratio) in E271 clay minerals are lower than those in metalliferous sediments, as well as distal hydrothermal plume particles and terrigenous clay minerals. This result suggests that some REE are lost during the smectite formation, perhaps because their large ionic radii of REE scavenged by Fe-oxyhydroxides preclude substitution in either tetrahedral or octahedral lattice sites of this mineral structure, which decreases the value of metalliferous sediments as a potential resource for REE.
机译:为了更好地了解沉积后热液材料的地球化学行为,研究了在13°N的东太平洋上升(EPR)附近收集的一个43厘米长的E271沉积物核,以研究蒙脱石的成因。 E271沉积物是典型的含金属沉积物。通过一系列化学方法去除有机物,碳酸盐,生物蛋白石和Fe-Mn氧化物后,通过X射线衍射,化学分析和Si同位素分析研究了粘土矿物(<2μm)。由于海底热液活动的影响并且靠近大陆,粘土矿物的来源很复杂。据建议,伊利石,绿泥石和高岭石是通过河流或风从北美或中美洲运输的,但绿土是自成岩的。它富含铁,其含量在粘土矿物中最高。数据表明,蒙脱石很可能是由水热氧化氢氧化铁与二氧化硅和海水在含金属沉积物中形成的。参与该反应的Si可能来自硅质微化石(硅藻或放射线虫),热液或碎屑矿物相。它们的δ30Si值高于自生蒙脱石的δ30Si值,这表明在形成过程中发生了Si同位素分馏,这是因为轻质Si同位素被选择性吸收到氢氧化铁上。 E271黏土矿物中的Sm / Fe质量比(代表总REE / Fe比率)低于含金属沉积物,远东热液羽流颗粒和陆源黏土矿物中的Sm / Fe质量比。该结果表明,某些稀土元素在蒙脱石形成过程中损失了,这也许是因为它们被铁羟基氧化物清除的大的离子稀土离子半径阻碍了该矿物结构的四面体或八面体晶格位置的取代,从而降低了含金属沉积物的潜在价值。 REE的资源。

著录项

  • 来源
    《海洋学报(英文版)》 |2018年第9期|67-81|共15页
  • 作者单位

    Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

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

    Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;

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

    Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-19 03:57:49
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