关键词: 花岗岩, 副族元素, 原地重熔, 矿田类型

Abstract:

Insitu melting (remelting) not only results in formation of granite, but also in enrichment of subgroup elements to form different types of oredeposits. The subgroup elements include oxyphiles and sulphophiles, and thus the related orefield can be divided into three types, i.e. of oxyphiles, of sulfophiles and of both composited. The first type that occurred in granite body with the ages similar to that of the host rock is controlled by magmatic differentiation and its appearance depends on the erosion depth of the rockbody. The occurrence of the second type generally with different distance from the source granite body is controlled by both the depth of protuberant magma interface (MI) and the attitude of orecontrolled structure. The formation of the third type is related to multiple melting (remelting), which is characterized by oxyphile (especially uranium) oredeposit within granite and oredeposit of sulfophiles in the surrounding of the rock body.

Key words:  granite;subgroup elements, insitu melting, types of orefield