| 论文题目 | In situ observations of tungsten speciation and partitioning behavior during fluid exsolution from granitic melt |
| 论文题目（英文） | In situ observations of tungsten speciation and partitioning behavior during fluid exsolution from granitic melt |
| 作者 | Ye Qiu;Xiaolin Wang;Jianjun Lu;周义明;万野;Rongqing Zhang;Wenlan Zhang |
| 发表年度 | 2022-10-29 |
| 卷 | 67 |
| 期 | |
| 页码 | 2358-2368 |
| 期刊名称 | Science Bulletin |
| 摘要 | |
| 摘要_英文 |
Most economically important tungsten (W) deposits are of magmatic-hydrothermal origin. The species and partitioning of W during fluid exsolution, considered to be the controlling factors for the formation of ore deposits, are thus of great significance to investigate. However, this issue has not been well addressed mainly due to the significant difference in reported partition coefficients (e.g., from strongly incompatible to strongly compatible) between fluid and melt (DWfluid/melt). Here, we used an in situ Raman spectroscopic approach to describe the W speciation, and to quantitatively determine the Dfluid/melt of individual and total W species in granite melts and coexisting Na2WO4 solutions at elevated temperatures (T; 700–800 ℃) and pressures (P; 0.35–1.08 GPa). Results show that WO42- and HWO4- are predominant W species, and the fractions of these two species are similar in melt and coexisting fluid. The partitioning behaviors of WO42- and HWO4- are comparable, exhibiting strong enrichment in the fluid.The total DWfluid/melt ranges from 8.6 to 37.1. Specifically, DWfluid/melt decreases with rising T–P, indicating thatshallow exsolution favors enrichment of W in evolved fluids. Furthermore, Rayleigh fractionation modeling based on the obtained DWfluid/melt data was used to describe the fluid exsolution processes. Our resultsstrongly support that fluid exsolution can serve as an important mechanism to generate W-rich oreforming fluids. This study also indicates that in situ approach can be used to further investigate the geochemical behavior of ore-forming elements during the magmatic-hydrothermal transition, especially for rare metals associated with granite and pegmatite.
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