| 东昆仑东段哈拉郭勒-哈图一带中生代的岩石隆升剥露--锆石和磷灰石裂变径迹年代学证据 |
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| 引用本文： | 王国灿 向树元 JohnI.Garver RobertP.Wintsch MaryRoden-Tice.东昆仑东段哈拉郭勒-哈图一带中生代的岩石隆升剥露--锆石和磷灰石裂变径迹年代学证据[J].地球科学,2003,28(6):645-652. |
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| 作者姓名： | 王国灿 向树元 JohnI.Garver RobertP.Wintsch MaryRoden-Tice |
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| 作者单位： | [1]中国地质大学地球科学学院，湖北武汉430074 [2]DepartmentofGeology,OlinCenter,UnionCollege,Schenectady,NewYork12308-2311,USA [3]DepartmentofGeologicalSciences,GeologyBuilding,IndianaUniversity,Bloomington,Indiana47405-1403,USA [4]EarthandEnvironmentSciences,StateUniversityofNewYorkatPlattsburgh,Platts-burgh,NY12901,USA |
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| 基金项目： | 国家自然科学基金，中国地质调查局地质调查项目，40072062，19991300004021，， |
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| 摘 要： | 根据对东昆仑地区东段哈拉郭勒—哈图一带不同高度基岩的系列锆石裂变径迹年龄分析，结合磷灰石裂变径迹年龄分析和中酸性侵入岩角闪石压力计分析揭示了东昆仑东段中生代的岩石隆升剥露冷却历史．巴隆哈图一带中酸性侵入岩角闪石压力计分析结果反映晚海西—印支期以来的总体剥露幅度约8～9km，早二叠世至晚三叠世初剥蚀作用极为缓慢，大约为20～40m／Ma．不同高程样品的锆石裂变径迹年龄分析结果揭示了东昆仑地区东段在中晚侏罗世处于缓慢的岩石隆升剥露阶段，其中中侏罗世相对较快，抬升速率77～88m／Ma，晚侏罗世相对较慢，抬升速率小于37m／Ma，且呈减慢趋势，这种减慢趋势反映了早中侏罗世之交强构造抬升期后的逐渐衰退．锆石裂变径迹—磷灰石裂变径迹年龄分析结果反映了中侏罗世以来的剥蚀速率一般不超过55m／Ma，岩石的剥蚀速率与岩石的抬升速率基本为同一量级，中侏罗世—白垩纪剥蚀作用与岩石抬升作用基本处于平衡状态。
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| 关 键 词： | 东昆仑东段 中生代 隆升剥露 锆石和磷灰石裂变径迹年代学 |
| 文章编号： | 1000-2383(2003)06-0645-08 |
Uplift and Exhumation during Mesozoic in Halaguole-Hatu Area, East Segment of Eastern Kunlun Mountains: Evidence from Zircon and Apatite Fission-Track Ages |
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| WANG Guo-can,XIANG Shu-yuan,John I. Garver,Robert P. Wintsch,Mary Roden-Tice.Uplift and Exhumation during Mesozoic in Halaguole-Hatu Area, East Segment of Eastern Kunlun Mountains: Evidence from Zircon and Apatite Fission-Track Ages[J].Earth Science-Journal of China University of Geosciences,2003,28(6):645-652. |
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| Authors: | WANG Guo-can XIANG Shu-yuan John I Garver Robert P Wintsch Mary Roden-Tice |
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| Institution: | WANG Guo-can~1,XIANG Shu-yuan~1,John I. Garver~2,Robert P. Wintsch~3,Mary Roden-Tice~4 |
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| Abstract: | This paper discusses the uplift and exhumation processes during Mesozoic in Halaguole-Hatu area, east segment of the eastern Kunlun, by dating the zircon and apatite fission-track ages and geobarometer analysis of the hornblende of intermediate-acidic intrusive rocks. The geobarometer analysis of the hornblende of intermediate-acidic intrusive rocks in Hatu area illustrates that the total exhumation range is about 8-9 km since the Late Hercynian-Indosinian, which happened vey slowly, about (20-)40 m/Ma, from the Early Permian to the early stage of the Late Triassic. While the zircon fission-tract age dating of the samples from different elevations reveals a slow uplift process during the Middle and Late Jurassic. The uplift rate in the Middle Jurassic, 77-88 m/Ma, is correspondingly faster than that in the Late Jurassic, less than 37 m/Ma. This slowing down tendency reflects the gradual decay of the intensive uplift at the boundary time of the Early and Middle Jurassic. The zircon and apatite fission-track age pairs show the exhumation rate is normally less than 55 m/Ma since the Middle Jurassic. Meanwhile, the rock exhumation rate is basically at the same quantity grade as that of its uplift rate, implying that its exhumation and uplifting were in equilibrium on the whole. |
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| Keywords: | east segment of the eastern Kunlun Mesozoic uplift and exhumation zircon and apatite fission-track chronology |
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