天山后碰撞阶段构造演化的新信息——来自阿吾拉勒山中段动力变质岩的证据  

New Information of Post-Col lisional Evolusion of the Tianshan Mountains——Evidence from Dynamic Metamorphic Rocks from the Middle Sector of Awulale Range

作　　者：李向东[1] 王庆明[1] 王克卓[2] 

机构地区：[1]新疆地质矿产勘查开发局地质矿产研究所,乌鲁木齐830000 [2]新疆地质矿产勘查开发局第一区域地质调查大队,乌鲁木齐830011

出　　处：《地质论评》1998年第4期443-448,共6页Geological Review

基　　金：国家305项目(编号969150703);国家自然科学基金重点项目(编号49734230)和原地质矿产部深部地质重点项目(编号9501203)共同资助

摘　　要：中国大山阿吾拉勒成矿带形成于石炭纪—二叠纪裂谷地质背景之上,其中段已发现著名的式可市台富铁矿床以及伴生的一系列铜矿点,成矿围岩为浅变质岩系。笔者根据近年研究,确定该含矿岩系实际是区域性挤压构造形成的动力变质岩带,其中云母片岩的绢云母经^(40)Ar/^(39)Ar定年,获得坪年龄220.6±3.4Ma和等时线年龄220.7±6.6Ma。这一成果揭示天山山脉在后碰撞地壳演化阶段,经历了晚三叠世构造热事件的改造。The Awulale metallogenic belt in the Tianshan Mountains of China is located in the Carboniferous-Permian rift. The Shikebutai iron deposits and some copper mineral occurrences in low-grade metamorphic rocks have been found in the middle segment of the belt. Based on recent investigations the metamorphic rocks are determined in the paper to be part of a dynamic metamorphic belt which originated from regionally compressional processes. The 40Ar/39Ar plateau age of 220. 6 ± 3-4 Ma and 40Ar/39Ar isochron age of 220. 7 ± 6-6 Ma yielded from sericites in the mica schists indicate the occurrence of the Late Triassic tecto-thermal event in the post-colli-sional evolution of the Tianshan Mountains.

关 键 词：天山 碰撞阶段 构造演化 变质岩 动力变质带 

分 类 号：P547[天文地球—构造地质学] P588.3[天文地球—地质学]