西藏察雅县谢坝锌多金属矿区黑云母斜长花岗岩岩体特征  

The Biotite Plagioclase Granite Characteristics of Xieba Zn Deposit in Chaya,Tibet

作　　者：张民[1] 刘显凡[1] 冯德新 赵甫峰[1] 楚亚婷[1,3] 李伟[1] 邓碧平[1] 

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]西藏自治区地勘局地热地质大队,西藏拉萨850000 [3]中节能建设工程设计院有限公司,四川成都610052

出　　处：《贵州大学学报（自然科学版）》2013年第4期24-30,共7页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目(40773031);教育部博士学科点基金项目(20115122110005);成都理工大学矿物学岩石学矿床学国家重点(培育)学科建设项目(SZD0407)

摘　　要：谢坝黑云母斜长花岗岩属硅过饱和钙碱性岩,主要矿物是斜长石,石英,黑云母,条纹长石;副矿物主要是榍石,锆石,磁铁矿;岩石明显受后期动力作用,碱交代蚀变较为普遍,钠长石化强于钾长石化。元素地球化学特征反映出岩源壳幔混染的特点,表现出I型花岗岩的特征,并有向A型花岗岩过渡的趋势,这突出地反映出其构造环境由晚造山向同碰撞环境的转换。The biotite plagioclase granite in Xieba belongs to silicon supersaturated calcium alkaline rock. The main minerals of it are plagioclase, quartz, biotite and perthite; The main accessory minerals are sphene, zircon and magnetite. The rock is affected by later motivation function; alkali metasomatic alteration is relatively com- mon; albitization is stronger than potassium feldspathization. The characteristics of elements geochemistry show crust-mantle mixing of rock source, and show the characteristics of I-type granite and have the trend of transiting to A-type granite, which reflects its tectonic setting changing from late-orogenic to syn-collision.

关 键 词：谢坝黑云母斜长花岗岩 元素地球化学 构造环境及源区性质 碱交代 

分 类 号：P588.12[天文地球—岩石学]