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Copper partitioning between granitic silicate melt and coexisting aqueous fluid at 850°C and 100 MPa

查看全文 作　　者：Shuilong [1,3]Wang;Hui [2]Li;Linbo [1]Shang;Xianwu [1]Bi;Xinsong [1]Wang;Wenlin [1]Fan 高影响力作者 机构地区：[1]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;[2]Geophysical Exploration Institute of Heilongjiang Province,Harbin 150036,China;[3]University of Chinese Academy of Sciences,Beijing 100039,China高影响力机构 出　　处：《Acta Geochimica》索引2016年第35卷第4期,共10页高影响力期刊 摘　　要：Experiments on the partitioning of Cu between different granitic silicate melts and the respective coexisting aqueous fluids have been performed under conditions of 850 °C, 100 MPa and oxygen fugacity(f O_2) buffered at approaching Ni–Ni O(NNO). Partition coefficients of Cu(DCu= cfluid/cmelt) were varied with different alumina/alkali mole ratios [Al_2O_3/(Na_2O·K_2O), abbreviated as Al/Alk], Na/K mole ratios, and Si O_2 mole contents. The DCu increased from 1.28 ± 0.01 to 22.18 ± 0.22 with the increase of Al/Alk mole ratios(ranging from 0.64 to 1.20)and Na/K mole ratios(ranging from 0.58 to 2.56). The experimental results also showed that DCuwas positively correlated with the HCl concentration of the starting fluid.The DCuwas independent of the Si O_2 mole content in the range of Si O_2 content considered. No DCuvalue was less than 1 in our experiments at 850 °C and 100 MPa, indicating that Cu preferred to enter the fluid phase rather than the coexisting melt phase under most conditions in the melt-fluid system, and thus a significant amount of Cu could be transported in the fluid phase in the magmatichydrothermal environment. The results indicated that Cu favored partitioning into the aqueous fluid rather than themelt phase if there was a high Na/K ratio, Na-rich, peraluminous granitic melt coexisting with the high Cl-fluid. 关 键 词：硅酸盐熔体 花岗质熔体 分配系数 水溶液 MPA 共存 SIO2含量 碱摩尔比
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