冀东地区变质岩中斜方辉石的研究  

A Study of orthopyroxene from Metamorphic Rocks of Eastern Hebei

作　　者：李殿超[1] 

机构地区：[1]长春地质学院

出　　处：《岩石矿物学杂志》1995年第2期185-190,共6页Acta Petrologica et Mineralogica

基　　金：地质矿产部科技攻关项目

摘　　要：通过对冀东地区３４个斜方辉石样品的研究得出结论：斜方辉石由早、晚两期变质作用形成。斜方辉石的化学成分变化主要与变质作用的条件及岩石中共存矿物种类有关，同时也受原岩成分的控制。据温压计的估算结果，早期变质作用的温度为８１７－９３７℃、压力为０．９９－１．１１ＧＰａ；晚期变质作用的温度为７４７－８３４℃、压力为０．９５ＧＰａ。A study of orthopyroxene samples from eastern Hebei shows that ortho-pyroxenes were formed by metamorphi9m of early and late stages.The var-iation in cbemical cmposition of orthopyroxene is mainly related to condi-tions of metamorphism and types of coexistent minerals,and also controlled by the composition of the protolith. Gcrvothermometer-geobarometer calcula-tions indicate t=817-937℃,P=0.99-1.11 GPa:at the early stage metamor-phism,and t=747-s34℃,P=0.95GPa at the late stage.

关 键 词：斜方辉石 变质作用 温压条件 变质岩 

分 类 号：P588.3[天文地球—岩石学]