摘要
滇西澜沧变质带中199件白云母b_0值分析结果表明,b_0值均在0.9020nm以上。与澜沧变质带遭受蓝片岩相高压变质作用的事实相吻合。此外,白云母b_0值的统计规律显示,澜沧变质带经历了多期变质作用,一期为高压变质作用,另一期为中压变质作用,这也与已知的地质现象相符。由此可见,白云母b_0值可以很好地反映多期变质作用。
Results obtained from measurement of 199 b_0 values of K-micas, which were sampled from Lancang metamorphic belt,Western Yunnan indicate that the b_0 values of K-micas represent completly regional high-pressure metamorphism occurring in Lancang metamorphic belt (with the bo values are more than 0. 902 0nm). This conclusion is consistent with the blueschist rock outcrops in this metamorphic belt. In this region there are not characteristic zonation of the b_0 values of K-micas. In addition, normal distribution curve of the b_0 values of K-micas indicates that muscovites are crystalized by poly-phase metamorphism.
出处
《矿物岩石》
CAS
CSCD
1993年第1期1-4,共4页
Mineralogy and Petrology
基金
国家自然科学基金
关键词
滇西澜沧
变质带
白云母
bo值
Lancang metamorphic belt
b_(0) values of muscovite
poly-phase metamorphism
blueschist phase
relative geobarometer
