苏北榴辉岩变质变形模式与苏胶造山带的隆升机制

A model of metamorphism and deformation of eclogites in northern Jiangsr and evolrtion of the Su-Jiao orogenic belt

苏北榴辉岩经历５期以上变质变形作用，其中至少有两期以上为高压变质变形作用，ｐ—ｔ轨迹呈顺时针方向旋转。榴辉岩形成后，随着地体的反弹、推覆，于印支期末迅速回返到中地壳，再经燕山期—喜山期区域隆升和拉伸折返，最终剥露于现代侵蚀面。苏胶造山带至少经历了晋宁期。

Eclogites in northern Jiangsu experienced over five stages of metamorphism and deformation, of which there are at least two stages of HP or UHP metamorphism and deformation. Their p T t trajectory rotates clockwise. After the eclogites formed, because of rebounding and overthrusting of the terrane, they quickly returned to the middle crust in Indosinian time, and then experienced regional uplift and extensional exhumation in the Yanshanian Himalayan times. Finally, they were exhumed onto the surface. The Su Jiao orogenic belt went through at least more than three orogenies or epeirorogenies, i.e. the Jinningian orogeny, Indosinian orogeny and Yanshanian orogeny.