安徽省大别山东段江岭地区榴辉岩及其围岩的变质作用研究

METAMORPHISM OF THE ECLOGITES AND THEIR COUNTRY ROCKS FROM JIANGLING AREA, EASTERN DABIE MOUNTAINS, ANHUI PROVINCE

安徽省大别山东段江岭地区的南大别碰撞杂岩主要由榴辉岩、云母片岩－变粒岩及片麻岩系组成，这三套岩石具有不同的变质演化阶段和Ｐ－Ｔ轨迹：榴辉岩有５个变质阶段，早期出现超高压型、高压型，晚期为中压型；云母片岩－变粒岩有４个变质阶段，早期出现高压型，晚期为中压型；片麻岩系仅有一期中压绿帘角闪岩相变质。三套岩石变质历史的差异，反映其所经历的构造过程不同。三者在构造作用下混杂到一起，构成碰撞混杂岩。

The southern Dabie collisional complex from the Jiangling area, eastern Dabie Mountains, Anhui Province comprises eclogites, mica schists leptynites and gneisses. These three rock series show different metamorphic evolutional stages and P T paths: the eclogites have 5 metamorphic stages where the early stages belong to ultra high and high pressure type and the late stage to medium pressure type, and were probably related to the subduction of a palaeo oceanic crust; the mica schists leptynites show 4 metamorphic stages where the early stages belong to high pressure type and the late stage to medium pressure type, and the early high pressure metamorphism was originated from the subduction of the Yangtze continental crust; the gneisses, however, are developed only with one stage of metamorphism of medium pressure type, and progbably related to the obducted North China continental crust. These three rock series of different origin were together subjected to the epidote amphibolite facies metamorphism of medium pressure type after they were tectonically mixed.