安徽铜陵典型矿区岩石包体研究及其岩浆——成矿作用过程探讨

铜陵地区岩浆岩中产有两类石包体，一类为属高于高角闪岩相的变质岩（残余）包体；另一类为属于二长岩－闪长岩类的岩浆岩包体，对这两类岩石包体进行了详细的岩石学和矿物学研究，并计算了了各类岩石包体的形成条件，在此基础上探讨了岩石包体与寄主岩浆岩之间的关系，分析了岩浆岩和有关矿床的物质来源和成岩成矿作用机制，提出了深部古老变质基底部分融－岩浆积聚，分异，并在不同层位就形，形成深位和浅位岩浆房－不同成分的岩浆混合－气液隐爆迁移沉淀这样一种与同熔型岩浆岩有关的新的层控矽卡岩矿床成矿模式。

ENCLAVES IN THE TYPICAL MINING DISTRICTS OF TONGLING,ANHUI AND THEIR IMPLICATION TO THE PROCESS OF MAGMATISM METALLOGENY

Two types of enclaves occur in the magmatic plutons in Tongling area,Anhui.The first type is residuals of metamorphic rocks of high amphibolite facies.The other one is magmatic rocks of monzonitic dioritic compositions.A detailed petrologic and mineralogic study and a forming condition calculation have been carried out on the two types of enclaves.On the basis of the study and the calculation,a systematical discussion has been made on the relation of the enclaves to their hosts,the material source of the magmatic rocks and associated mineral deposits,and the mechanism of magmatism metallogeny.This leads to propose a new metallogenetic model for stratabound skarn type ore deposits associated with the magmatic rocks of the syntectic type.The new model can be simply summarized as partial melting of old metamorphic basement rocks in depth,followed by accumulating,differentiating and emplacing of magmas to form the deep level and shallow level magma chambers,then the mixing of different compositon magmas associated with their crypto explosion,migration of the gas bearing ore fluid and precipitating of metals in the fluid within the magmas.