秦岭大别碰撞造山带中隆升最高的结晶基底便是大别杂岩，在超高压变质岩和某些高级变质岩中均发现典型的近等温减压（ＩＴＤ）型的退变质结构，多呈后成合晶或冠状体的形式取代或包绕原生矿物晶粒（主晶），显示退变质不平衡反应的过程．然而超高压变质岩与大别杂岩中的高级变质岩，变质地温梯度截然不同，暗示它们形成的构造条件极不相同，超高压变质岩早期由岩石圈深处（１２０ｋｍ±）折返到下地壳与那里的高级变质岩构造混合，平行并置，而后才一起隆升．退变质不平衡结构与寄主岩的面理无关，说明这种近等温的减压退变质作用发生于后造山时期近绝热条件下的隆升体制，近绝热隆升的热源可能是中生代以来大别山地区岩石圈减薄所引起 The most uplifted crystalline basement in the Dabie collisional orogenic belt in the Qinling Mountains was Dabie complex. Typical ITD-type retrogressive structures were found in both UHP metamorphic rocks and some high-grade metamorphic rocks Substitution or wrapping of the primary mineral grains (main crystals) in the form of a posterior commissural or coronal body shows the process of the degenerated imbalance reaction. However, the ultrahigh-pressure metamorphic rocks are quite different from the high-grade metamorphic rocks and metamorphic geothermal gradients in the Dabie complex, suggesting that the tectonic conditions are very different. The ultrahigh-pressure metamorphic rocks were rebuilt from the deep lithosphere (120 km ±) to the lower crust Mixed with high-grade metamorphic rocks there, juxtaposed in parallel, before rising together. The structure of the retrogressive mass imbalance has nothing to do with that of the host rock, indicating that this near-isothermal de-stressing metamorphism occurs during the post-orogenic period under the near-adiabatic uplift regime. The source of the adiabatic uplift may be the Dabieshan region since the Mesozoic Thinning caused by the lithosphere