摘要
内蒙卓资地区早前寒纪经历两期麻粒岩相变质作用。第一期发生于２５００Ｍａ，变质作用峰期温度为７５７—８２０℃，压力为０．８—１．０Ｇｐａ，属于增温增压到降温降压的Ｐ—Ｔ—ｔ演化轨迹，这与本区变质岩系发生构造加厚作用有关，第二期变质发生于２０００Ｍａ，变质作用峰期温度为７６１—８５０℃压力为，０．５─０．６５Ｇｐａ，其Ｐ一Ｔ─ｔ轨迹属于典型的造山带演化模式。
Two epoches of granulite-facies metamorphism are recognized in Zhuozi,Inner ,Mongolia: The first epoch of metamorphism; occuring about 2500Ma, reached its peakcondition of T = 757￣ 820℃and P = 0.8 ￣ 1 .0Gpa.It belongs to a pattern of quickly raisingP-T,then declining. This process might be genetically related to tectonic thiekness ofsupererustal pile of this area. The second epoch, of metamorphism occurred about 2000Ma.Its peak P-T condition is 761￣850℃,and 0.5￣ 0. 65Gpa, The P-T-t path in the secondepoch of metamorphism is a evolution pattern .which typically belongs to orogenic belt.
关键词
麻粒岩相
P-T-T轨迹
变质作用
早前寒武纪
Early Precambrian period
granulite-facics
metamorphism,P-T-t path Zhuozi.
