摘要
正冲云英斑岩产于燕山期金鸡岭复式花岗岩基内,富含锂、铷、锡、铯、钨等稀有金属元素,岩体即是矿体。初步研究表明,它是一种新的岩浆岩类型和矿床类型,由富含稀有金属的云英质岩浆超浅成结晶而成。这种云英质岩浆是在富氟、锂花岗质岩浆液态分异作用的基础上进一步演化形成的。
The Zhengchong rare-metal greisen porphyry occurs in the Yanshanian Jinjiling composite granitic batholith. It is rich in Li, Rb, Sn, Cs and W: thus the rock body is just an ore body. The greisen porphyry, which has similar mineral composition to greisen, is characterized by ultra-hypabyssal (subvolcanic) textures and structures, higher petrogenic temperature (875℃)and intrusive relationship with the country rocks. It is chemically characterized by high fluorine and high rare alkali elements and K_20>>Na_20. Preliminary studies indicate that the greisen porphyry was formed by rare metal-rich greisenic magma under ultra-hypabyssal conditions. It is a new type of magmatic rocks and mineral deposit. Preliminary study suggests that the greisen magma was formed by evolution of quasi-greisenic magmas resulting from liquid immiscibility of fluorine-and lithium-rich granitic magmas.
出处
《地质论评》
CAS
CSCD
北大核心
1990年第6期534-539,共6页
Geological Review
