Stability Relations of Silicates in the System K2O-FeO- A12O3-SiO2-H2O

本研究的目的是：(1)建立矿物的稳定性关系；(2)确定若干泥质变质台地的变质条件和历史。除了在1989年完成Picuris和铁-铁研究外，贺德威还将完成以下工作：(1)完成缅因州低压变质作用研究；(2)完成铁堇青石稳定性的测定；(3)对可能的橄榄岩非理想性进行研究，并检索一组自洽的热力学数据集，这些数据集有望提供有关叶质变质岩的压力、温度和流体成分的有用约束。这将增加我们对粘土（页岩，当石化时）被埋、加热和变成片岩的条件的理解。

The objectives of this research on pelitic metamorphic rocks at SMU are: (1) to work out stability relations of minerals, and (2) to determine metamorphic conditions and history of a number of pelitic metamorphic terrances. In addition to finishing the Picuris and ferric-ferrous study on staurolite during 1989, Holdaway will: (1) complete the study of low-pressure metamorphism in Maine; (2) complete the determination of Fe- cordierite stability; and (3) undertake a study of possible staurolite nonideality and retrieve a self-consistent set of thermodynamic data-set that promises to provide useful constraints on pressure, temperature, and fluid composition in petitic metamorphic rocks. This will add to our understanding of the conditions under which clays (shales, when lithified) are buried, heated, and become schists.