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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 Ulalale metallogenetic belt of the Dashan Mountains in China is formed above the Carboniferous-Permian rift geological background. In the mid-section, the famous Keketaifutai iron ore deposit and a series of associated copper deposits have been discovered. For the shallow metamorphic rocks. Based on recent years’ research, the author determined that the ore-bearing rock series are actually the dynamic metamorphic rock belt formed by the regional crustal structure. The sericite of mica schist is dated by ~ (40) Ar / ~ (39) Ar, 3.4 Ma and isochron age 220.7 ± 6.6Ma. This result reveals that the Tianshan Mountains experienced the reconstruction of the tectonic thermal events in the Late Triassic during the post-collision crustal evolution.