中国西部新元古代榴辉岩-花岗岩带和深层次韧性剪切带特征及其大陆再造意义  

Characteristics of Neoproterozoic eclogite-granite zones and deep level ductile shear zone in western China and their significance for continental reconstruction

作　　者：于海峰[1] 陆松年[1] 梅华林[1] 赵风清[1] 李怀坤[1] 李惠民[1] 

机构地区：[1]中国地质科学院天津地质矿产研究所,天津300170

出　　处：《岩石学报》1999年第4期532-538,共7页Acta Petrologica Sinica

基　　金：中国地质调查局95 资源与环境攻关项目

摘　　要：通过对甘肃北山榴辉岩－花岗岩带、柴北缘含柯石英榴辉岩－花岗岩带和阿尔金韧性剪切带岩石构造和同位素年代学研究认为， 在新元古代， 塔里木、华北 （？） 和柴达木三个地块在中国西部甘青新交界处逐步汇聚。其中， 华北与柴达木在８００～１０００Ｍａ 期间首先汇聚， 形成柴北缘含柯石英榴辉岩－花岗岩带。之后， 塔里木向东运移并与柴达木斜接， 斜接带为具有同剪切伟晶岩脉和岩体 （９１３Ｍａ） 的韧性剪切带， 即新元古代阿尔金断裂。在８６０～８８０Ｍａ 左右， 塔里木向东运移到华北边缘， 与华北地块－柴达木地块拼合， 在柳园一带形成榴辉岩－花岗岩带。Through the studies of the litho tectonic and isotopic characteristics of the Liuyuan eclogite granitoids belt, Chaibeiyuan coesite bearing eclogite granitoids belt and Altyn Tagh ductile shear zone, it is determined that the assembly of the three blocks of Tarim, North China and Qaidam took place gradually in the early Neoproterozoic in the juncture of Gansu Qinghai Xinjiang provinces of western China. During this process, firstly, the convergence between North China block and Qaidam block was in the age of 800～1000Ma, and produced the Chaibeiyuan coesite bearing eclogite granitoids belt. Then, Tarim block moved eastwards and juxtaposed with Qaidam block, the juxtaposition zone is in the character of ductile shear zone with the syn shearing pegmatite dyke swarm and mass(913Ma), that is so called the Neoproterozoic Altyn Tagh Fault. Finally, Tarim block moved to the southwestern edge of North China block and converged with North China Qaidam block in the age of about 860～880Ma,and that produced the Liuyuan eclogite granitoids belt.

关 键 词：榴辉岩 花岗岩 韧性剪切带 大陆再造意义 

分 类 号：P588.121[天文地球—岩石学] P588.3[天文地球—地质学]