东昆仑约格鲁岩体暗色微粒包体特征及成因  被引量:74

Features and origin of mafic microgranular enclaves in the Yuegelu granite in the Eastern Kunlun

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作  者:刘成东[1,2] 张文秦[1] 莫宣学[1] 罗照华[1] 喻学惠[1] 李述为[1] 赵欣[1] 

机构地区:[1]中国地质大学 [2]华东地质学院江西抚州344000

出  处:《地质通报》2002年第11期739-744,共6页Geological Bulletin of China

基  金:"花岗岩重大地质问题研究"项目(编号:200113900018)之"东昆仑造山带岩浆混合花岗岩及其填图方法基础研究"课题的成果。

摘  要:对东昆仑约格鲁花岗岩体中暗色微粒包体的形态、大小、成分和分布等主要特征进行了较详细地研究。发现包体形态多样,以强烈的塑性流变为特征;包体大小悬殊,多数直径为几十厘米,最大者长轴达4m;包体成分以闪长质为主,结构总体上比寄主岩石的粒度细,岩体中不同部位的包体成分和结构都有所变化;包体分布不均匀,经常呈族状、条带状密集分布,具定向性。镜下研究发现,在包体中经常见到针状磷灰石、石英捕虏晶和斜长石的自形内核环带及增生边等现象,显示了岩浆混合成因的特点。The form,size,composition and distribution of mafic microgranular enclaves in the Yuegelu granite in the Eastern Kunlun are studied in detail.The enclaves are characterized by a great variety of forms and strong plastic rheology;their sizes are highly varied,being usually tens of centimeters in diame-ter,and the largest one has a long-axis length of up to400cm;they are mainly dioritic in composition and fine-grained than the host rock in texture as a whole,with the composition and texture varying somewhat in different parts of the rock;they are of uneven distribution,usually occurring densely as clus-ters and bands,and are oriented.Under the microscope,acicular apatite,quartz xenoliths and the idiomor-phic inner core zone and overgrowths of plagioclase are often found,all of which show the features of magma mixing.

关 键 词:暗色微粒包体 岩浆混合作用 花岗岩 东昆仑 包体 

分 类 号:P588.121[天文地球—岩石学]

 

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