摘要
根据对铅石山榴辉岩岩石学、岩石化学、地球化学元素、变质岩相及变质作用等特征,该类岩石形成时代可能为中元古代后期,并经历了四堡期、晋宁期、加里东期三次快速折返及相应的退变质作用叠加,进一步证实了柴北缘地区高压变质带的存在。
Based on the study of the petrology, petrochemistry, geochemistry,metamorphic facies and metamorphism, and so on, the author hold that Qianshishan eclogitewas probably formed in Later Middle Proterozoic era and subjected backtrack andretrogressive metamorphism in three times (Sibao stage, Jinning stage and Caledonianstage). It may support the view that there is a high pressure metamorphic belt in the northmargin of Qaidam Basin.
关键词
榴辉岩
高压变质带
中元古代
变质作用
形成时代
变质岩相
eclogite
high pressure metamorphic belt
Middle Proterozoic
north margin of QaidamBasin
