广东上磜复式花岗岩体地质特征及形成机制  

Geological Characteristics and Formation Mechanism of the Shangqi Composite Granite Body,Guangdong

作　　者：马浩明[1] 陈国能[1] 彭卓伦[1] 邵荣松[1] 庄文明[1] 

机构地区：[1]中山大学地球科学系,广东广州510275

出　　处：《中山大学学报（自然科学版）》2006年第2期105-108,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：教育部高等院校博士点基金资助项目(20030558005)

摘　　要：长达数km的地质探洞揭示广东上磜岩体是由两期花岗岩组成的复式岩体。通过地表调查和岩体内部结构的详细研究,建立了复式岩体的成因模型。与岩体有关的各种地质现象,包括边缘混合岩、伟晶岩、石英萤石脉以及花岗岩中的各类中基性岩脉等,在模型中构成了一个有机的整体,证实本区地壳在中生代至少经历了两次原地熔融或重熔事件。A tunnel of more than 3 000 m long reveals that the Shangqi granite in Guangdong is composed of two granite bodies formed in different periods of the Mesozoic. The various geological phenomena related to formation of the composite body, including marginal migmatite, pegmatite in the contact between two granite bodies, quartz - fluorite-calcite veins over pegmatite, intermediate-basic dikes, etc. , can be observed clearly in the tunnel. Based on the observations, a model concerning the formation mechanism of the composite granite body is advanced, in which the various geological phenomena form a logical system, demonstrating two crustal melting events happening during the Mesozoic in this area.

关 键 词：花岗岩 复式岩体 中基性岩脉 壳内熔融 重熔界面 

分 类 号：P581[天文地球—岩石学]