| 西天山山脉多期次隆升-剥露的裂变径迹证据 |
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| 引用本文：陈正乐,万景林,刘健,李胜祥,郑恩玖,韩效忠,李细根,宫红良.2006.西天山山脉多期次隆升-剥露的裂变径迹证据[J].地球学报,27(2):97-106. |
| DOI：10.3975/cagsb.2006.02.01 |
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| 基金项目:国家基础规划研究项目(编号:2001CB409808、2001CB7110013); 国家自然科学基金青年基金项目(编号:40102022) |
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| 中文摘要:磷灰石的裂变径迹法已经广泛地应用于限定山脉的隆升剥露历史研究。天山山脉的隆升历史一直存在争议,西天山山脉的构造隆升研究则相对更为缺乏。野外系统采集三个横穿西天山察汗乌苏山剖面的花岗岩、火山岩等样品,挑选磷灰石开展了裂变径迹测试分析工作。测试结果表明,西天山可能存在多期次的构造隆升事件;进一步利用实测的磷灰石裂变径迹年龄数据和径迹长度,开展了磷灰石的温度时间反演模拟研究。模拟结果结合区域性的地质资料分析推断,西天山山脉自中生代以来存在4个阶段构造隆升剥露事件,分别为:三叠纪末—早侏罗纪(220～180Ma)、侏罗纪中期(170～140Ma)、白垩纪中期(110～80Ma)和晚新生代(24Ma以来)。 |
| 中文关键词:西天山 裂变径迹 隆升与剥露 |
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| Multi-Stage Uplift and Exhumation of the West Tianshan Mountain: Evidence from the Apatite Fission-Track Dating |
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| Abstract:The apatite fission track dating method has been widely applied in the study of the uplift and exhumation history of mountains. The uplifting process of the Tianshan Mountains has long been controversial, and still less attention has been paid to the West Tianshan Mountain. A series of samples, consisting of granite and some other volcanic rocks, were collected from three sections across the Chahanwushu Mountain of West Tianshan, and apatite was chosen for fission track dating in the laboratory. The results reveal that the West Tianshan Mountain has probably experienced multi-stage uplifting and exhumation events. Further temperature-time modeling of apatite was conducted on the basis of analytical data of the fission track length. Combined with studies of regional data, it is suggested that there existed four stages of rapid cooling and uplifting events in the West Tianshan Mountain during the Mesozoic-Cenozoic period, i.e., from Late Triassic to Early Jurassic (220～180 Ma), in Middle Jurassic (160～130 Ma), in Middle-Late Cretaceous (110～80 Ma), and in Late Cenozoic (since ca.24 Ma). |
| keywords:West Tianshan Mountain apatite fission track dating uplift and exhumation |
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