广西大厂层状花岗质岩石地质、地球化学特征及成因初探

在广西大厂拉么矿区黑云母花岗岩岩体周围的层状花岗质岩石,其地质产状、成岩时代、结构构造、矿物成分、化学成分及稀土元素、微量元素地球化学特征等方面与一般的交代岩不同,也与一般的岩浆成因花岗岩不同;成岩物质既有岩浆来源又有地层来源,反映了与笼箱盖岩体同源的岩汁或热液沿层交代泥盆系的成因特征。它与层状锡多金属矿体、层状夕卡岩及层状锌-铜矿体等共同构成燕山期酸性岩浆作用所形成的层状交代体系。

GEOLOGY,GEOCHEMISTRY AND GENESIS OF BEDDED GRANITIC ROCKS IN DACHANG,GUANGXI

Bedded granitic rocks occurring in Lamo, Dachang, around a granite intrusion, has a distinct geological occurrence, petrogenetic epoch, structure and texture, mineral and chemical composition and REE and trace element geochemical characteristics. They are different from both general metasomatite and normal magmatogenic granite. Its materials might come from both magmas and host rocks, indicating that it was formed when the ichor (or hydrothermal solution) replaced the Devonian siliceous shale and so on. The bedded granitic rocks together with bedded skarns, bedded Zn-Cu ore bodies and bedded Sn-polymetallic mineralization bodies form a bedded metasomatic system formed by the Yanshanian acid magmatism.