准噶尔盆地周缘造山带裂变径迹研究及其地质意义  

Fission Track Analysis of Junggar Basin Peripheral Orogen and Its Geological Significance

作　　者：李玮[1] 胡健民[2] 渠洪杰[2] 

机构地区：[1]西北大学大陆动力学国家重点实验室地质学系,西安710069 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《地质学报》2010年第2期171-182,共12页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号40802051);西北大学大陆动力学国家重点实验室科技部专项经费资助成果

摘　　要：通过对准噶尔盆地东西两侧造山带地质剖面观察、系统裂变径迹测年与热演化模拟结果分析,并结合前人研究结果,准噶尔盆地周缘造山带中,主要经历了中生代晚期构造热事件。通过裂变径迹分析对比,准噶尔盆地两侧造山带具有不同的隆升历史,盆地西北缘早于东部隆升,隆升速率亦大于东部。准噶尔盆地西北缘自白垩纪以来经历了由准噶尔盆地边缘向扎伊尔山先后依次隆升事件,表明了准噶尔西北缘逆冲断裂系向盆内后展式逆冲推覆。准噶尔盆地东西两侧造山带岩石裂变径迹数据均反映了白垩纪以来的冷却隆升事件,充分证实了燕山晚期构造运动在准噶尔地区的普遍存在,为详细研究燕山期新疆北部陆内构造活动提供了证据。This study conducted systematic fission track dating and thermal analysis of the evolution of simulation results based on the observation of the cross sections in the eastern and western orogenic belt of the Junggar Basin. The research in combination with previous results shows that the peripheral orogenic belt of the Junggar Basin underwent tectonic thermal event during the late Mesozoic. Fission-track analysis and comparison shows that the orogenic zones on both sides of the Junggar Basin have different uplift history. The northwestern margin rose earlier than the eastern part, with the former＇s uplift rate greater than the latter. Northwestern margin of Junggar Basin has experienced since the Cretaceous rises subsequently from the edge of Junggar Basin to the Zaire mountain uplift events followed one after another, indicating that the northwestern margin of the Junggar thrust fault system thrust to the internal basin by overstep propagation. Fission track data of both sides of the Junggar Basin reflects cooling event since the Cretaceous, and fully confirms that by the late Yanshan tectonic movement was prevalent in the Junggar region, providing vital evidence for a detailed study Yanshanian intracontinental tectonic activities in northern Xinjiang.

关 键 词：裂变径迹 热史模拟 准噶尔盆地 

分 类 号：P542[天文地球—构造地质学]