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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。
The black hard chlorite metamorphic belt in the north of Tongbai is located in the northern part of Tongbai Dabieshan orogenic belt and is close to the structural melange belt of the Tongshang fault zone. The mineral assemblage containing black hard chlorite metamorphic rocks consists of black hard chlorite + cumolite + epidote + muscovite + albite ± biotite ± chlorite ± quartz. The metamorphic rocks are gabbro and plagiogranite. The metamorphic thermo-compression conditions are about 1 ± 0 .3 GPa and 70 3.15 ± 32 3.15 K, which are the products of strain degenerated metamorphism of gabbro and plagiogranite blocks in the mylonitization of the Indosinian (230 Ma) .