Phase Equilibria and Crystal-Chemistry of Some Calcic Amphiboles ,

该项目将研究几种化学反应，这些化学反应将揭示钙质角闪石中的重要化学过程。(1)铝在角闪洞中溶解度的压力和温度依赖性；(2)在1-10 kbar的压力范围内，比较天然透闪石与合成透闪石的上热稳定性。(3)对钛在寄生体中的溶解度进行研究，以确定角闪石中的钛含量是否如实地研究所表明的那样是一个很好的温度指标。(4)研究透闪石中F-和Cl-OH交换动力学，以确定卤化物交代发生的速度。(5)采用一种独特的方法，在斜辉石和橄榄石的自发成核晶体中形成H2O-CO2流体包裹体，这种方法是由透闪石的不一致溶解产生的，将用于测试流体包裹体在进展变质过程中如何准确地代表流体的组成。该研究对确定区域变质作用条件具有较强的基础应用价值。

The project will investigate several chemical reactions that will shed light on important chemical processes in calcic amphiboles. It will address the following processes: (1) The pressure and temperature dependence of Al solubility in amphibole (2) The upper thermal stability of natural tremolite will be compared with that of synthetic tremolite in the pressure range of 1-10 kbar. (3) A study of the solubility of Ti in pargasite will be made to see if the Ti content of amphiboles is a good indicator of temperature, as field studies suggest. (4) the kinetics of F- and Cl-OH exchange in tremolite will be investigated to determine how rapidly halide metasomatism can occur. (5) A unique method of forming H2O-CO2 fluid inclusions in spontaneously nucleated crystals of clinopyroxene and forsterite, resulting from incongruent dissolution of tremolite, will be employed to test how accurately fluid inclusions represent the composition of a fluid during prograde metamorphism. The study has strong basic application to the determination of conditions during regional metamorphism.