Experimental study on tin partition between granitic silicate melt and coexisting aqueous fluid

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著者

    • Hu Xiaoyan HU XIAOYAN
    • State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
    • Bi Xianwu BI XIANWU
    • State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
    • SHANG LINBO
    • State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
    • FAN WENLING
    • State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences

抄録

The distribution of tin between different granitic silicate melts and coexisting aqueous fluids have been determined at 850°C, 100 MPa and <i>f</i><sub>O2</sub> near NNO. Tin distribution coefficients <i>D</i><sub>Sn</sub><sup>aq.fl./melt</sup> are constrained by the composition of melt. When the starting fluid is 0.1 M HCl, <i>D</i><sub>Sn</sub><sup>aq.fl./melt</sup> decreases rapidly from 0.130 ± 0.090∼0.137 ± 0.016 to 4.22 (±0.47) × 10<sup>-3</sup> with the Na<sub>2</sub>O + K<sub>2</sub>O mole content and ASI of melt varying from 6.55 to 9.39% and 1.37 to 0.66, respectively, and tin concentrations in aqueous fluids and <i>D</i><sub>Sn</sub><sup>aq.fl./melt</sup> decrease from 9.26 ± 0.56 to 0.220 ± 0.013 μg/g and 3.70 (±0.42) × 10<sup>-2</sup> to 1.29 (±0.15) × 10<sup>-3</sup>, respectively with Na/K mole ratio increasing from 0.43 to 1.57 and nearly constant ASI from 1.04 to 1.10. A series of experiments that use the same K-rich peraluminous haplogranitic melt as starting solid whereas investigate the effects of chlorine and fluorine, the presence of chlorine in aqueous fluids increases <i>D</i><sub>Sn</sub><sup>aq.fl./melt</sup> because of tin complexing, the presence of fluorine in the starting fluid does not significantly influence on <i>D</i><sub>Sn</sub><sup>aq.fl./melt</sup>. For the chlorine experiments, <i>D</i><sub>Sn</sub><sup>aq.fl./melt</sup> shows a positive dependence on the concentration of HCl in the starting fluid with log <i>D</i><sub>Sn</sub><sup>aq.fl./melt</sup> = 2.0247 × log[HCl] + 0.6717 ([HCl] unit is M), and SnCl<sub>2</sub> is the dominant tin-bearing complex in aqueous fluid. The results of this experiment showed that the peralkalinity of granitic melt and F-bearing in granite can lead to the enrichment of tin in melt phase, and, therefore, they probably serve as a tin ore reservoir or an important transport medium for tin ore formation, whereas K-rich peraluminous granitic melt and high HCl concentrations in the aqueous fluid phase are favorable for tin partitioning in aqueous fluid.

収録刊行物

  • Geochemical journal : journal of the Geochemical Society of Japan  

    Geochemical journal : journal of the Geochemical Society of Japan 42(2), 141-150, 2008-04-01 

    GEOCHEMICAL SOCIETY OF JAPAN

参考文献:  64件

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各種コード

  • NII論文ID(NAID)
    10021093161
  • NII書誌ID(NCID)
    AA00654975
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00167002
  • NDL 記事登録ID
    9470202
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z53-R488
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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