| The Partitioning of Tungsten bwtween Aqueous Fluids and Silicate Melts |
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| 摘 要： |
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| 关 键 词： | 钨 水成流体 不稳定性 花岗岩 硅酸盐熔融 |
The partitioning of tungsten between aqueous fluids and silicate melts |
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| Authors: | Xu Yongsheng Zhang Benren Han Yinwen |
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| Institution: | (1) China University of Geosciences, 430074 Wuhan |
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| Abstract: | An experimental study has been carried out to determine the partition coefficients of tungsten between aqueous fluids and
granitic melts at 800 °C and 1.5 kb with natural granite as the starting material. The effects of the solutions on the partition
coefficients of tungsten show a sequence of P > CO
3
2−
> B > H2O. The effects are limited (generallyK
D
< 0.3) and the tungsten shows a preferential trend toward the melt over the aqueous fluid. The value ofK
D
increases with increasing concentration of phosphorus; theK
D
increases first and then reduces with the concentration of CO
3
2−
when temperature decreases, theK
D
between the solution of CO
3
2−
and the silicate melt increases, and that between the solution of B4O
7
2−
and the silicate melt decreases. The partition coefficients of phosphorus and sodium between fluids and silicate melts have
been calculated from the concentrations of the elements in the melts. TheK
D
value for phosphorus is 0.38 and that for sodium is 0.56. Evidence shows that the elements tend to become richer and richer
in the melts. |
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| Keywords: | partition coefficient aqueous fluid melt volatile |
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