retrogressive metamorphism
1.Retrogressive Metamorphism of Archaean Granulites and the Evidence of Rb-Sr Isochron Age in Zhangjiakou and Xuanhua Regions
2.They had experienced the progressive metamorphism of epidote amphiboli-te-amphibolite facies in the Caledonian cycle and retrogressive metamorph ism (regional dynamometamorphism) of greenschist-epidote amphibolite facies in the Hercynian cycle.
