燕山地区是华北地台北缘东部古陆块的主要部分,经历了漫长复杂的地质发展过程。太古代一套深变质的岩石记录着多次变质作用。退变质作用属变质作用的一种类型,过去对进变质作用进行过广泛的研究,而退变质作用则研究得较少。近二十多年来,各国地质学家在这方面取得了迅速的进展。几年来我们在冀东迁安、迁西、北京密云、张宣等地对麻粒岩相岩石作了一些退变质作用方面的工作。 The Yanshan area is the main part of the ancient eastern block in the northern margin of the North China platform and has experienced a long and complicated geological development process. A set of deeply metamorphosed rocks in the Archean record several metamorphism. Degenerated metamorphism is a type of metamorphism. In the past, extensive studies have been conducted on the metamorphism, while retrogressive effects have been less studied. For nearly two decades, geologists from all over the world have made rapid progress in this area. Over the past few years we moved to the east of Jidong, move west, Beijing Miyun, Zhang Xuan and other places on the granulite facies rocks made some degeneration and metamorphism work.