【摘要】 利用江西宜春414岩体中的钠长石花岗岩作为实验初始物,制备含不同P2O5含量(0.27%～7.71%)的实验玻璃,本次实验研究了100MPa、850℃和800℃条件下Sn在流体与富磷过铝质熔体相间的分配。实验结果显示,Sn在流体与熔体相间的分配系数(DfSlnuid/melt)变化于2.10×10-4～1.36×10-3之间,指示Sn强烈趋向于在富磷过铝质熔体中富集。随体系中P2O5含量从0.27%增至1.91%,Sn在流体与熔体相间的分配系数逐渐增加,当体系中P2O5含量进一步增加时,Sn在两相间的分配系数呈降低的趋势。本次实验结果表明,P可能不是Sn以流体相形式进行搬运的主要络合剂。更多还原

【Abstract】 The albite granite of Yichun stock,added with 0.27%-7.71% P2O5,was chosen as the initial composition.The partition coefficients of Sn between the phosphorus-rich peraluminous granitic melt and coexisting aqueous fluid were determined at 100 MPa and 800 °C and 850 °C.The experimental results show that the partition coefficients (=Cfluid/Cmelt,where Cfluid and Cmelt are the concentrations of Sn in the aqueous fluid and the melt,respectively) vary from 2.10×10-4 to 1.36×10-3,indicating that Sn partitions preferentially into the hydrous melts.The partition coefficients of Sn increased with increasing P2O5 content from 0.27%to 1.91%,but decreased when the P2O5 content further increased.According to our experimental results,P is probably not the main complexant for the transportation of Sn in fluids evolved from a granitic magma.更多还原