西天山隆升-剥露过程初步研究
Preliminary study on the uplifting-exhumation process of the western Tianshan range, northwestern china
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摘要: 天山造山带是在古生代造山基础上,在新生代由于印亚碰撞的远程效应而陆内再造成山.本文主要用磷灰石裂变径迹测年分析来限定西天山的隆升-剥露过程.野外系统采集西天山山脉及其伊犁盆地钻孔中的样品,挑选磷灰石进行了裂变径迹测试分析工作,着重开展了磷灰石的温度-时间反演模拟研究.根据温度-时间模拟结果推断,西天山在中新生代期间共发生了3期次的快速冷却作用,分别为早侏罗纪(200～180Ma)、白垩纪中期(115～95Ma)和新生代期间(24Ma以来);根据样品位置分析表明,西天山的隆升-剥露作用并不均一,开始于侏罗纪早期的山脉抬升范围有限,仅局限于中天山;白垩纪中期(115～95Ma),整个西天山山脉和伊犁盆地一起发生整体的抬升和剥露;新生代24Ma以来,西天山的山体块体抬升与山间盆地的断陷同时发育.
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