Phase Equilibria and Solution Modelling of Silicates and Oxides

本项目是NSF EAR 84-16254资助的研究的延续，涉及对常见造岩矿物相平衡的实验研究。反相平衡实验，加上实验结果的热力学建模，将为确定含这些矿物的岩石形成过程中的温度、压力和氧化条件提供基础。该项目的具体目标包括：(1)继续进行三元长石的实验，(2)检查钡对两长石平衡的影响，(3)继续进行少量成分对铁-钛氧化物平衡的影响的实验，以及(4)研究含钛黑云母的稳定性。这些研究结果将增加我们对不同压力和温度条件下常见造岩矿物行为的理解，并将为确定地质物质的形成条件提供改进的方法。

This project is a continuation of research previously supported by NSF grant EAR 84-16254, involving experimental studies of the phase equilibria of common rock-forming minerals. Reversed phase equilibrium experiments, coupled with thermodynamic modelling of the experimental results, will provide the basis for determination of the temperature, pressure, and oxidation conditions during the formation of rocks containing these minerals. Specific objectives of the project include (1) continued experiments on ternary feldspars, (2) examination of the effects of barium on two- feldspar equilibria, (3) continued experiments on the effects of minor components on iron-titanium oxide equilibria, and (4) study of the stability of titanium-bearing biotite. The results of these studies will increase our understanding of the behavior of common rock-forming minerals under diverse conditions of pressure and temperature, and will provide improved methods for determining the conditions of formation of geological materials.