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位于桐柏大别山造山带北缘桐柏信阳地段的豫南高压镁铁质麻粒岩块体主要由石榴角闪二辉麻粒岩类组成。其岩相学和矿物学特征表明它们曾经历过温度Ｔ／Ｋ＞１２６１．１５±５０，压力ｐ≥２．０ＧＰａ，２．０ＧＰａ～１．６ＧＰａ和Ｔ／Ｋ＞９７３．１５ｐ＝１．４ＧＰａ等多阶段近等温减压变质作用，有着似大陆碰撞造山带的很陡的顺时针ｐ－Ｔ轨迹。它们形成于地壳增厚深埋和隆升减薄过程中，而终至抬升折反剥露地表的动力学，可能和壳底逆冲韧性剪切拆离伸展等多种构造作用相关
The south Henan high-pressure mafic granulite block located in the Tongbai Xinyang section on the northern margin of the Dabie Mountains in Tongbai mainly consists of two types of pomegranate hornblens. Its petrographic and mineralogical characteristics indicate that they have experienced temperatures T / K> 1261.15 ± 50, pressures p ≥ 2.0GPa, 2.0GPa ~ 1.6GPa and T / K> 973.15p = 1.4GPa And other multi-stage near-isothermal decompression metamorphism, with the continent collision orogenic belt very steep clockwise p-T trajectory. They formed during the thickening of the crust and in the process of uplifting and thinning, and the kinetics of the surface uplift and inversion may be related to various tectonic processes such as the crustal bottom thrusting ductile shear detachment and extension