JADEITE STABILITY MEASURED IN PRESENCE OF SILICATE LIQUIDS IN SYSTEM NAALSIO4-SIO2-H20

被引：56

作者：

BOETTCHER, AL

WYLLIE, PJ

机构：

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1968年 / 32卷 / 09期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0016-7037(68)90064-1

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The reactions nepheline + high albite ⇋ Jadeite and high albite ⇌ Jadeite + quartz were measured in the presence of high-pressure vapors and silicate melts in the system NaAlSiO4-SiO2-H2O for the temperature range 600-800°C. Kinetics were such that complete reaction was attained in most runs. The results of these determinations together with previous studies in this system and recent thermochemical data collectively place narrow restrictions on the positions of the above reactions over a wide temperature range. An entropy change of 3.5 eu accompanying the transformation of low to high albite is in good agreement with these results. Some data are also provided for the reaction analcite + high albite ⇋ Jadeite + vapor. It is concluded that Jadeite can form in a variety of geologic environments at pressures lower than previously determined. © 1968.

引用

页码：999 / +

页数：1

共 37 条

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