首页|期刊导航|中国地球化学学报(英文版)|The Activity of H2O, Fugacity of O2 and Variation of Their Chemical Potential During Metamorphic Peak of the Granulite Complex Near Taipingzhai-Louzishan Region,East Hebei Province
中国地球化学学报(英文版)2001，Vol.20Issue(2)：97-107,11.
The Activity of H2O, Fugacity of O2 and Variation of Their Chemical Potential During Metamorphic Peak of the Granulite Complex Near Taipingzhai-Louzishan Region,East Hebei Province
The Activity of H2O, Fugacity of O2 and Variation of Their Chemical Potential During Metamorphic Peak of the Granulite Complex Near Taipingzhai-Louzishan Region,East Hebei Province
摘要
Abstract
The thermodynamic calculation of dehydration reacton suggests very low activity of H2O during metamorphic peak of the Archaean granulite complex in the region studied. The aH2o values for Al-rich gneiss and hypersthene biotite gneiss-granulite in the Taipingzhai region are usually between 0.10 and 0.20, and those in the Louzishan region are 0.15 - 0.25. The fugacity of O2 in terms of lgfo2 in the whole region ranges from - 8 to - 14. The average co- 1.60 respectively, and those in the Louzishan region are - 0. 364 and - 1. 420. The activity of H2O is very low in the whole region, but its values and other data mentioned above are considerably constant from place to place within a given region, even in rocks of different lithological characters. However, they show a certain gradient between different regions. Such characteristics are compatible with the genetic mechanism known as "carbonic metamorphism" put forward by Newton et al., i. e., the a H2o during the peak stage is controlled by permeation of pervasive CO2 influx of the mantle source, and shows features of external buffering.关键词
activity of H2O/fugacity of O2/coefficient of chemical potential/granulite facies metamorphism/East Hebei ProvinceKey words
activity of H2O/fugacity of O2/coefficient of chemical potential/granulite facies metamorphism/East Hebei Province分类
天文与地球科学引用本文复制引用
卢良兆,董永胜,周喜文..The Activity of H2O, Fugacity of O2 and Variation of Their Chemical Potential During Metamorphic Peak of the Granulite Complex Near Taipingzhai-Louzishan Region,East Hebei Province[J].中国地球化学学报(英文版),2001,20(2):97-107,11.基金项目
This research project was financially supported by the National Natural Science Foundation of China (Grant No. 49772144). （Grant No. 49772144）
