Experimental Geochemistry of Rock-Forming Minerals

9310264牛顿这个项目是为了研究许多不同主要矿物的热力学稳定性，包括硅酸盐、氧化物、水合物和碳酸盐。将获得的数据对于建立热力学数据集以计算天然矿物组合的稳定性至关重要。将集中在热力学性质仍不确定的重要矿物物种上。由于矿物性质在自洽数据集中的相互依赖性质，准确测量的关键矿物的自由能、热焓和熵的插入将迫使数据集中大多数其他矿物的热力学参数发生变化。将测量几个重要矿物族的固溶体自由能数据。可使用的方法是在高温和压力下进行简单体系相平衡测量，包括在存在单一组分或混合气相和多离子氧化物熔体的情况下进行实验，以及溶液量热法。对关键的石榴石、辉石、长石、云母和碳酸盐矿物的热力学形成和固溶体性质的准确定义，将大大提高计算地球过程非均相平衡的能力。

9310264 Newton This project is to investigate the thermodynamic stabilities of many different major minerals, including silicates, oxides, hydrates and carbonates. The data to be acquired are of crucial importance to the erection of thermodynamic datasets for calculation of the stabilities of natural mineral assemblages. The concentration will be on important mineral species whose thermodynamic properties are still uncertain. Because of the interdependent nature of mineral properties in the self-consistent datasets, insertion of accurately-measured free energies, enthalpies and entropies of key minerals will force changes of the thermodynamic parameters of most of the other minerals of the datasets. Free energy data of solid solution will be measured for several important mineral families. Methods to be used are simple-system phase equilibrium measurements at elevated temperatures and pressures, including experiments in the presence of a single-component or mixed vapor phase and with polyionic oxide melts, and solution calorimetry. Major improvement in the ability to calculate heterogeneous equilibria of earth processes will result from accurate definition of the thermodynamic formation and solid solution properties of key garnets, pyroxenes, feldspars, micas and carbonate minerals.