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

文献类型：期刊论文

作者Rong Kunbo1,3; Zeng Zhigang1,2,3; Yin Xuebo1; Chen Shuai1; Wang Xiaoyuan1; Qi Haiyan1; Ma Yao1
刊名ACTA OCEANOLOGICA SINICA
出版日期2018-09-01
卷号37期号:9页码:67-81
ISSN号0253-505X
关键词metalliferous sediments smectite formation REE silicon isotope
DOI10.1007/s13131-018-1265-6
通讯作者Zeng Zhigang(zgzeng@ms.qdio.ac.cn)
英文摘要A 43 cm long E271 sediment core collected near the East Pacific Rise (EPR) at 13 degrees 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 m) 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 their Si-30 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 Feoxyhydroxides. 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.
资助项目National Natural Science Foundation of China[41325021] ; National Basic Research Program (973 Program) of China[2013CB429700] ; National Special Fund for the 12th Five-Year Plan of COMRA[DY125-12-R-02] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; Qingdao National Laboratory for Marine Science and Technology[2015ASTP-0S17]
WOS研究方向Oceanography
语种英语
出版者SPRINGER
WOS记录号WOS:000445730400008
源URL[http://ir.qdio.ac.cn/handle/337002/160368]  
专题海洋研究所_海洋地质与环境重点实验室
通讯作者Zeng Zhigang
作者单位1.Chinese Acad Sci, Inst Oceanol, Seafloor Hydrothermal Act Lab, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Rong Kunbo,Zeng Zhigang,Yin Xuebo,et al. Smectite formation in metalliferous sediments near the East Pacific Rise at 13 degrees N[J]. ACTA OCEANOLOGICA SINICA,2018,37(9):67-81.
APA Rong Kunbo.,Zeng Zhigang.,Yin Xuebo.,Chen Shuai.,Wang Xiaoyuan.,...&Ma Yao.(2018).Smectite formation in metalliferous sediments near the East Pacific Rise at 13 degrees N.ACTA OCEANOLOGICA SINICA,37(9),67-81.
MLA Rong Kunbo,et al."Smectite formation in metalliferous sediments near the East Pacific Rise at 13 degrees N".ACTA OCEANOLOGICA SINICA 37.9(2018):67-81.

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来源：海洋研究所

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