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      Strontium Isotope Compositions of Hydrothermal Barite from the Yonaguni IV: Insight into Fluid/Sediment Interaction and Barite Crystallization Condition

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          Hydrothermal barite is a typical low-temperature mineral formed during the mixing of hydrothermal fluid and seawater. Because of its extremely low solubility, barite behaves as a close system after crystallization and preserves the geochemical fingerprint of hydrothermal fluid. In this study, the elemental contents and Sr isotope compositions of hydrothermal barites from the Yonaguni IV were determined using electron microprobe and LA-MC-ICP-MS respectively. On these bases, the fluid/sediment interaction during the hydrothermal circulation and physicochemical condition of barite crystallization were discussed. Results show that the 87Sr/ 86Sr values of hydrothermal barites from the Yonaguni IV are apparently higher than those of the seawater and associated volcanic rocks, indicating the sufficient interaction between the hydrothermal fluid and overlying sediment. Monomineral Sr abundance shows large variations, reflecting the changes in barite growth rate during the fluid mixing. The mineralization condition in the Yonaguni IV was unstable. During the crystallization of barite, hydrothermal fluid and seawater mixed in varying degrees, with the proportions of hydrothermal fluid varied from 36% to 72%. The calculated crystallization temperatures range from 109 to 220°C. Sediment plays a critical role during the mineralization process in the Yonaguni IV and incorporation of sediment component into hydrothermal system was prior to barite crystallization and sulfide mineralization.

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          Journal of Ocean University of China
          Science Press and Springer (China )
          24 January 2020
          01 April 2020
          : 19
          : 2
          : 377-385
          1Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
          Author notes
          *Corresponding author: ZHAI Shikui, E-mail: zhai2000@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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