THE TYPES,FEATURES AND GENESIS OF ENCLAVES IN GRANI-TOIDS IN THE JUNCTION OF GUANGDONG AND GUANGXI

Based on the study of petrography and mineralogy, the enclaves in granitoids are parametamorphites of amphibolite facies and granulite facies, and the types of enclave rocks include hyperthene-granulite, geneiss, granulite and enclaves riched mica. The forming temperatures and pressures of amphibolite facies and granulite facies enclave rocks are 633℃, 460 MPa~550 MPa and 781~883℃, 530 MPa~710 MPa, respectively. The enclaves are remnants of rocks which partially melted to form granitoid magma. The genesis of enclave rocks of amphibolite facies and granulite facies in Darongshan and Shiwandashan regions is reginal dynamothermal metamorphism. In contrast, the genesis of enclave rocks of granulite facies in Yunkai region is thermal dome metamorphism.