摘要
本文以豫西地区小秦岭、外方山为例 ,将磁铁矿系列花岗岩进一步划分为两大类 :一类与金矿具密切的空间关系 ,本文命名为 MI 型花岗岩 1 ,以文峪岩体、合峪岩体为代表 ;另一类成金能力较差的岩体 ,本文命名为 MS型花岗岩 ,以华山岩体、太山庙岩体为例。两类岩体在化学成分、矿物含量、同位素组成等方面均有一定差异。 MI 和 MS型花岗岩的源岩是一致的 ,均为陆内俯冲碰撞地壳板块俯冲下插作用所产生的物质 ,其成分及含矿性差异与源岩部分熔融程度、岩浆演化及其分熔序列有关。 MI 型花岗岩是在下地壳源岩分离熔融晚阶段、源岩部分熔融程度较高、环境较氧化的条件下形成的。
Two types of magnetite series granites with different auriferous capability,named M I and M s respectively,were recognized in the western Henan.Though the source rock of the two is the same,their chemical composition,mineral content and isotopic component are different.The difference in composition and auriferous capability in the two types of granites was related to the extent of partial melting of the source rock,the magmatic evolution and the fractional melting sequence.Auriferous M I granite was resulted from the late stage fractional melting of the lower crust source rock which pocessed high degree of partial melting and oxidation environment.
出处
《矿物岩石》
CAS
CSCD
北大核心
2001年第4期23-27,共5页
Mineralogy and Petrology
关键词
磁铁矿系列花岗岩
含金差异性
评价
magnetite series granite
auriferous difference
appraisal
