中国桐柏大别构造带变质演化的岩石学证迹

桐柏大别构造带是秦岭造山带的东延部分，经历过多期次不同体制的构造运动，现今的桐柏大别山区是由一系列变质地体拼合而成，地体与地体之间为断层或韧性剪切带所围限各地体有自身变质变形史和PTt轨迹，但却有着碰撞造山带所共有的后造山抬升过程。本文揭示了随县群、红安岩群及大别杂岩中柯石英榴辉石、蓝晶铝直闪石片岩及紫苏石榴黑云母片麻岩的退变质再平衡结构特点。报道了大别山麻粒岩相变质年龄为1699Ma。各类岩石减压退变质再平衡结构，标志着后造山的隆升过程及其对桐柏大别构造带变质演化的启示。

The Petrology Evidence of Metamorphic Evolution in Tongbai-Dabie Tectonic Belt

Tongbai-Dabie tectonic belt, eastern extension of Qinling orogenic belt, experi-enced multistage evolutions under different tectonic regimes. The present Tongbai-Dabie area is composed of a collage of metamorphic terranes. The faults of ductile shear zones delimit these metamorphic terranes. Although each terrane has its own metamorphic and deformational history and unique PTt path, All terrane undergo common postorogenic up-lift in collison orogenic belt. The paper presents the features of retrogressive metamorphism reeguilibrinm textures from coesite eclogite, kyanite gedrite schist and hypersthene garnet biotite gneiss in Suixi-an Group, Hongan Guroup and Dabie complex. Recent zircon U-Pb dating of the granulitic rock is 1699±128Ma Reequilbrium textures in above rocks suggest a prominant post orogenic uplift in the Tongbai-Dabie tectonic-metamorphic belt.