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

对马厂箐岩体中发现的暗色微粒包体的岩相学研究后发现，暗色微粒包体为暗黑色、灰黑色，大部分呈浑圆状或次圆状，可见明显的塑性流变特点，且具有微细粒结构，发育针状磷灰石，部分包体中还含有寄主岩石中的钾长石和石英斑晶.这些岩相学特征都表明了马厂箐岩体中的暗色微粒包体是岩浆混合作用的产物.暗色微粒包体的发现反映了马厂箐岩体可能是壳幔岩浆混合成因，而幔源岩浆的注入是这套岩浆成矿的关键因素.

PETROGRAPHY AND GENESIS OF THE DARK MICROGRANULAR ENCLAVES IN THE MACHANGQING INTRUSIVE BODY, WESTERN YUNNAN PROVINCE

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.