【摘要】 桐柏北部的黑硬绿泥石变质带位于桐柏大别山造山带北部 ,紧邻桐商断裂带的构造混杂岩带中。含黑硬绿泥石变质岩的矿物组合由黑硬绿泥石 +阳起石 +绿帘石 +白云母 +钠长石±黑云母±绿泥石±石英组成。其变质原岩为辉长岩和斜长花岗岩类。变质温压条件约为 1± 0 .3GPa,70 3.15± 32 3.15 K,是印支期 (2 30 Ma)区域构造糜棱岩化过程中辉长岩和斜长花岗岩块应变退化变质作用的产物。更多还原

【Abstract】 The stilpnomelane metamorphic belt in northern Tongbai is located in the north of Tongbai Dabie orogenic belt and within the tectonic molange belt adjacent to the Tongbai Shangcheng fault belt.The mineral assemblages of the stilpnomelane bearing metamorphic rocks are composed of stilpnomelane+actinolite+epidoite+phengite+albite±biotite+chlorite±quartz.The protolith of stilpnomelane bearing metamorphic is identified as metagabbro and meta oligoclase granite.The estimated temperature and pressure of metamorphism are 703.15±323.15 K, 1±0.3 GPa respectively which was resulted from strain retrograde metamorphism of the metagabbro and meta oligoclase granite during the regional ductile shearing mylonitization in the late Triassic.更多还原