滇西澜沧变质带中白云母的研究及其地质意义  

A Study of Muscovites from the Lancang Metamorphic Belt in Western Yunnan and Its Geological Significance

作　　者：赵靖[1] 

机构地区：[1]北京大学地质系,北京100871

出　　处：《岩石矿物学杂志》1993年第3期251-260,共10页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金

摘　　要：本文以滇西澜沧变质带中最为广泛分布的造岩矿物——白云母为对象,详细研究和分析了其成分、多型类型及b_0值等,探讨了白云母的发育规律。研究结果表明,本带中绝大多数白云母为多硅白云母,且为3T+2M_1型,与蓝闪石共生的则以3T多硅白云母为主。此外,澜沧变质带经历了蓝闪石片岩亚相的高压变质作用,与古特提斯构造演化密切相关,并可与世界著名的高压带对比。This paper is devoted to the study of muscovites, the most extensivelydistributed rock--forming minerals in the Lancang metamorphic belt of westernYunnan. Their composition, polytypes and b_0 values are analysed and examinedin detail, and the regularity of their growth is tentatively discussed. It isshown that the overwhelming majority of muscovites are phengites of 3T + 2M_1type whereas those associated with glaucophane are mainly 3T phengites.Studies also indicate that the Lancang metamorphic belt underwent high--pressuremetamorphism of blue schist subfacies and was closely related to the evolutionof paleotethys. Therefore, it can be correlated with other well--known high--pressure belts in the world.

关 键 词：变质带 白云母 变质作用 地质意义 

分 类 号：P578.963[天文地球—矿物学]