摘要
角闪石-斜长石-石英共生组合广泛存在于从绿片岩相到角闪麻粒岩相的基性变质岩中,但至今还没有适用于这种矿物组合的以多相矿物平衡为基础的压力计。本文使用Holland和Powell的“内部一致的热力学数据”直接标定了多相矿物平衡反应的平衡条件。结果表明反应对压力敏感,是一个适用于角闪石-斜长石-石英共生组合的有效的地质压力计。应用于甘肃东部天水地区李子园群变质火山岩。
In this paper, the equilibrium condition of the reaction tremolite + albite = edenite + 4quartz is directly Calibrated using Holland and Powell's 'internally consistent thermodynamic data' The InK contour diagram shows that the reaction is sensitive to pressure and that the Calibration is an available barometer suitable to amphibole-plagioclase-quastz assemblage which is common in the metamorphosed basic rocks from greenschist to amphibolite-granulite transition facies. A successful application to the metamorphosed volcanics of Liziyuan group. Tianshui district, eastern Gansu, Shows that the pressure dirived from this barometer is reliable.
关键词
地质压力计
角闪石
斜长石
石英
geothermobarometry, amphibole-plagioclase-quartz barometry, metamorphosed uolcanics of Liziyuan group, eastern Gansu
