PETROGRAPHY AND GENESIS OF THE DARK MICROGRANULAR ENCLAVES IN THE MACHANGQING INTRUSIVE BODY, WESTERN YUNNAN PROVINCE
WANG Liang1,2, GUO Xiao-dong2, JIA Li-qiong1, WANG Zhi-hua2, ZHANG Ting-yan2
1. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China; 2. Institute of Gold Geology, CAPF, Langfang 06500, Hebei Province, China
Abstract:A detailed petrographic study on the dark microgranular enclaves found in the Machangqing intrusive rock body shows that, the enclaves are mostly dark black or grayish black in color, round or sub-round in shape, with apparent plastic rheological characteristics. The enclaves are in micro-fine granular texture, containing acicular apatites, K-feldspar and quartz phenocrysts from the host rocks. These characteristics suggest the magma mixing origin of the enclaves, indicating that the Machangqing intrusive rock may be the production of mixing of crust-derived and mantle-derived magma. The injection of mantle-derived magma is a key factor to the mineralization of such magma.
王梁, 郭晓东, 贾丽琼, 王治华, 张廷彦. 滇西马厂箐岩体暗色微粒包体岩相学特征及成因机制探讨[J]. 地质与资源, 2012, 21(3): 332-336,295.
WANG Liang, GUO Xiao-dong, JIA Li-qiong, WANG Zhi-hua, ZHANG Ting-yan. PETROGRAPHY AND GENESIS OF THE DARK MICROGRANULAR ENCLAVES IN THE MACHANGQING INTRUSIVE BODY, WESTERN YUNNAN PROVINCE. GEOLOGY AND RESOURCES, 2012, 21(3): 332-336,295.