Experimental and Theoretical Determination of Solubilities of Rock-Forming Minerals

9802100瓦尔特 该奖项旨在确定在高温（400至650 ℃）和高压（高达3 kbar）下，在酸性溶液和盐水溶液（0.05、0.1、0.5、1.0摩尔HCl和NaCl）中，红柱石和石英的实验平衡溶解度;地质上重要的矿物。该奖项支持的实验将涉及在高压和高温下使用独特的热液设备提取流体样品，然后通过一系列现代分析技术确定流体中所有挥发性和非挥发性成分的浓度。 理论分析的一个重要部分是在确定平衡时必须考虑中性物种的活度系数。 在Al_2 O-H_2 O-NaCl-HCl体系中，Al的形态分布与pH、离子强度、压力和温度的函数关系模型有望建立。建议的实验应该限制可能的溶液成分，铝可以从地壳变质过程中的铝和含铝相沉淀。

9802100Walther This award is to determine experimental equilibrium solubilities of corundum, and andalusite plus quartz; geologically important minerals, at elevated temperatures (400 to 650 C) and pressures (up to 3 kbar) in acid solutions and aqueous salt fluids (0.05, 0.1, 0.5, 1.0 molal HCl and NaCl). The experiments supported by this award will involve extracting fluid samples while they are at high pressure and temperature with a unique hydrothermal apparatus and then determining the concentration of all volatile and non-volatile constituents of the fluid through a battery of modern analytical techniques. An important part of the theoretical analysis is that activity coefficients of neutral species must be considered when determining the equilibrium. Hopefully a model of Al speciation as a function of pH and ionic strength as well as pressure and temperature can be constructed in the Al2O-H2O-NaCl-HCl system. The proposed experiments should put limits on the possible solution compositions from which aluminum can be transported and aluminum bearing phases precipitate during metamorphism of the earth's crust.