Petrology and Peak p-t Conditions of Susong Metamorphic Complex in the Huangzhen-Liangtinghe Area in the Southern Dabie Mountain and Comparison with high-Pressure Eclogites

Based on the field geological survey, lithography and thermodynamics evaluation, and p-t condition change of peak metamorphism in the Susong metamorphic complex (SSC), this study discussed the lithological compositions and metamorphic features of the Susong metamorphic complex (SSC). The results indicate that the Susong complex can be divided into three zones from north to south, with epidote-amphibolite to amphibolite facies as the main metamorphism. The temperature and pressure ranged from 398 to 613℃ and 0.61~1.53GPa, respectively, with average p-t conditions of 517℃±50℃ and 1.03±0.21GPa. But the metamorphic complex does not show any characteristics of glaucophane facies and temperature zonation or gradual temperature trend within the complex. Compared with the peak p-t conditions of the HP-unit from the South Dabie Terrane, differences of time and temperature between the SSC and HP-unit from the South Dabie Terrane is at least 0.92 GPa and 45℃ gap, indicating the SSC and HP-unit from the South Dabie Terrane should be juxtaposed under tectonic activity.