华南花岗岩暗色微粒包体矿物组成及微结构研究  

A study of mineral composition and microtexture of the mafic microgranular enclave in granites in SE China

作　　者：彭卓伦[1] Rodney Grapes 庄文明 张献河 

机构地区：[1]中山大学地球科学系,广东广州510275 [2]Department of Earth and Environmental Sciences,Korea University [3]广东省佛山地质局,广东佛山528000 [4]广东省地质调查院,广东广州510080

出　　处：《地学前缘》2011年第1期63-73,共11页Earth Science Frontiers

基　　金：高等学校博士学科点基金项目(20070558033;20030558005);中央高校基本科研业务费专项资金项目(32110-3161318);中国地质调查局资助项目(200013000126)

摘　　要：对来自华南多个花岗岩体的暗色微粒包体样品进行了系统的矿物组成和微结构研究,发现包体中不管是造岩矿物还是副矿物,均存在新、老两个不同世代;包体的微结构大部分情况下也不是"火成结构",而是以熔融结构为主,并且常多种结构共存,揭示包体是岩石部分熔融的残余物而并非来自岩浆的结晶。不同包体或同一包体从中心到边缘的矿物组成与微结构的差异,反映原岩部分熔融程度的不同,揭示其处于不同的演化阶段。Observations of mineral composition and microtexture of the mafic microgranular enclaves（MMEs） from different granite bodies in SE China demonstrated that no matter what mineral,rock-forming or accessory,two generations of the mineral were found coexisting in all samples of the MMEs.Most of the MMEs were not with igneous texture,as they were generally considered,but with the melting texture.Multi-types of textures coexisted in the same enclave suggested that the MMEs should have been derived from the residues of partial melting of rocks.Differences of mineral composition and microtexture between MMEs or between core and rim of one MME suggested a varying melting degree of source rocks,implying that the MMEs were in different evolution stages in magma.

关 键 词：花岗岩 暗色微粒包体 矿物组成 微结构 

分 类 号：P588.121[天文地球—岩石学] P588.122[天文地球—地质学]