【作者】 袁万明； 董金泉； 保增宽； 安银昌；

【Author】 YUAN Wanming DONG Jinquan BAO Zengkuan AN Yinchang Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100039 Xinjiang Institute of Geological Exploration for Nonferrous Resources, (U|¨)r(u|¨)mgi, Xinjiang, 830000

【机构】 中国科学院高能物理研究所中国科学院核分析技术重点实验室； 新疆维吾尔自治区有色地质矿产勘察院；

【摘要】 在新疆阿尔泰造山带所获得的19个锆石裂变径迹年龄变化于155～243 Ma之间,明显地分为2组,分别对应于2个构造活动期,早期为155～189 Ma,晚期为189～243 Ma。这与磷灰石裂变径迹年龄反映的62～100 Ma和100～160 Ma两个构造期完全一致。早期和晚期构造活动期持续的时间分别为54～60 Ma和34～38 Ma,而这两个构造期之间的间隔时间,则从早到晚由83～89Ma变为89～93 Ma。同时,锆石裂变径迹年龄与距特斯巴汗断裂和巴寨断裂的距离有关,反映这两条断裂带对区域构造演化的控制作用。更多还原

【Abstract】 Totally 19 zircon fission track ages were obtained. These ages range from 155 Ma to 243 Ma and can obviously divided into two tectonic episodes, i.e., 155-189 Ma and 189-243 Ma, which are consistent with two tectonic episodes from apatite fission track ages (62-100 Ma and 100-160 Ma). It is shown that the durations of the early and the late tectonic episodes are 54-60 Ma and 34-38 Ma respectively, with the intervals between the early and the late tectonic episodes changing from 83- 89 Ma at the early stage to 89-93 Ma at the late stage. The average cooling speeds are circa 1.744℃/Ma during 243 Ma and 62 Ma and circa 1.371 ℃/Ma from about 62 Ma to the present day. In addition, the zircon fission track ages are related to the distances from the Tesbahan fault and the Basei fault, indicating that these faults must have controlled the regional tectonic evolution.更多还原