Experimental Geochemistry of Rock-Forming Minerals

建议继续研究浓电解质溶液的热力学性质及其在深地条件下与造岩矿物和熔体的相互作用。先前的工作已经确定了可能的深部地壳/上地幔流体的一个重要性质，即由于压力诱导的离子解离，浓缩盐水的水活性低，但碱迁移率高。盐水的这种性质可能对地壳水平的融化有重要的影响。当前研究的主要目标是描述这些流体的活度-浓度关系，确定在这些盐水存在下各种硅酸盐组合的熔化能力，并限制地壳条件下矿物和硅酸盐熔体之间的碱和氧同位素的分配系数。

9632591 Newton It is proposed to continue an investigation of the thermodynamic properties of concentrated electrolyte solutions and their interaction with rock-forming minerals and melts under deep-earth conditions. Previous work has identified an important property of possible deep crust/upper mantle fluids, namely a low H2O activity and yet high alkali mobility of concentrated brines owing to pressure-induced ionic dissociation. This property of brines could have important implications for melting at crustal levels. The main objectives of the current study are to describe the activity-concentration relationships of such fluids, to determine the melting capability for various silicate assemblages in the presence of these brines, and to constrain partition coefficient of alkalis and oxygen isotopes between minerals and silicate melts under crustal conditions.