Experimental Geochemistry of Rock-Forming Minerals

9632591牛顿建议继续研究浓电解质溶液的热力学性质及其在地球深部条件下与造岩矿物和熔体的相互作用。以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，即由于压力引起的离子解离，浓缩卤水的H2O活度低，但碱迁移率高。卤水的这种性质可能会对地壳水平的融化产生重要影响。目前研究的主要目的是描述这种流体的活度-浓度关系，确定在这些卤水存在下各种硅酸盐组合的熔融能力，并在地壳条件下限制碱和氧同位素在矿物和硅酸盐熔体之间的分配系数。

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.