摘要
辉石是本区的主要造岩矿物,在麻粒岩相岩石中分布比较广泛。综合研究表明,本区斜方辉石的一个显著特征是普遍较富铁,从含铁量的变化范围来看,矿物的含铁量和岩石中的含铁量大致呈正相关关系。单斜辉石中FeO、MgO、CaO的含量变化较小,从化学成分上对比,单斜辉石MgO的含量与斜方辉石MgO含量都受岩石成分所控制。本文所研究的两种辉石均属平衡共生关系,据二辉石矿物对获得本区麻粒岩相变质作用的温度为800-900℃,压力为(7—10)×108Pa。
The Archean granulite rocks in Inner Mongolia occur mainly in Jining and Wulashan Groups which extend from Hadamengounear Baotouin the west to JiningXinghe area in the east, roughly in E-W direction. The main rock-forming mineral is pyroxene widely distributed in the granulite rocks. Integrated studies indicate that the orthopyroxene there is commonly rich in iron, that the variation in iron content of the mineral is in direct correlation with that of the rock, that the FeO, MgO and CaO contents of clinopyroxene vary in a rather small range and that the MgO content of clinopyroxene is similar to that of orthopyroxene, both controlled by the components of the rocks.The two pyroxene in this paper belongs to the equilibriumassociated relation. The metamorphic temperatures obtained for thetwo-pyroxene pair are 800-900℃. In the light of rock types and paragenetic association of the minerals it is inferred by calculation that the pressure is between(7-10)×10~8Pa, suggesting that the granulite belongs to the medium pressure phase.
出处
《岩石矿物学杂志》
CAS
CSCD
1990年第2期180-188,共9页
Acta Petrologica et Mineralogica
关键词
麻粒岩相
辉石
矿物学
结晶
pyroxene mineralogy
metamorphism
granulite facies
Jining group of Inner Mongolia
