熊耳山下元古界片麻岩岩石地球化学及成因  

THE GEOCHEMISTRY AND GENESIS OF XIONGERSHAN LOWER PROTEROZOIC GNEISS

作　　者：廖庆园[1] 邓红卫 严新泺[1] 廖家飞[1] 王毅泽[3] 

机构地区：[1]桂林理工大学地球科学学院,桂林541004 [2]中国科学院广州地球化学研究所,广州510630 [3]昆明理工大学,昆明650093

出　　处：《云南地质》2012年第2期263-266,共4页Yunnan Geology

摘　　要：熊耳山片麻岩中最基性的样品可近似代表其原岩,很有可能直接来源于地幔熔融的玄武质岩浆,在伸展构造环境下侵入地壳,从而促使部分地壳物质也发生部分熔融,形成中性-酸性岩浆岩,经历变质作用形成片麻岩。片麻岩的地球化学特征暗示华北克拉通南缘在早元古代仍存在一定程度的陆壳增生。The ultrabasic rock sample in Xiongershan gneiss may approximately represent the original rock,which originates very possibly from the basaltic magma of mantle melt,then intrudes into the crust in the extensional tectonic environment,causes the crust material to melt partially and form intermediate,acid magmatic rock,results in the gneiss because of metamorphism.The geochemical characteristics of gneiss indicate that there was a certain accretion of continental crust in S margin of North China craton in Early Proterozoic.

关 键 词：地球化学特征 岩石成因 太华群片麻岩 早元古代 华北熊耳山 

分 类 号：P58[天文地球—岩石学]