| 新疆东天山红云滩地区构造-热演化探讨:来自Ar-Ar和(U-Th)/He热年代学的约束 |
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| 引用本文： | 孙敬博,孙腾飞,陈文,喻顺,尹继元,李超,张彦,刘新宇.新疆东天山红云滩地区构造-热演化探讨:来自Ar-Ar和(U-Th)/He热年代学的约束[J].岩石学报,2015,31(12):3732-3742. |
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| 作者姓名： | 孙敬博 孙腾飞 陈文 喻顺 尹继元 李超 张彦 刘新宇 |
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| 作者单位： | 中国地质科学院地质研究所同位素热年代学实验室, 大陆构造与动力学国家重点实验室, 北京 100037,长安大学地球科学与资源学院, 西安 710054,中国地质科学院地质研究所同位素热年代学实验室, 大陆构造与动力学国家重点实验室, 北京 100037,中国地质科学院地质研究所同位素热年代学实验室, 大陆构造与动力学国家重点实验室, 北京 100037,中国地质科学院地质研究所同位素热年代学实验室, 大陆构造与动力学国家重点实验室, 北京 100037,国家地质实验测试中心, 北京 100037,中国地质科学院地质研究所同位素热年代学实验室, 大陆构造与动力学国家重点实验室, 北京 100037,中国地质科学院地质研究所同位素热年代学实验室, 大陆构造与动力学国家重点实验室, 北京 100037 |
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| 基金项目： | 本文受国家自然科学基金项目(41473053、41403046)、地质矿产调查评价项目(12120113015600)、国土资源部公益性行业科研专项经费项目(201511064-2)和中国地质科学院地质研究所基本科研业务费项目(J1525)联合资助. |
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| 摘 要： | 红云滩岩体位于东天山觉罗塔格西部,对其进行热演化历史研究对于揭示觉罗塔格地区乃至整个东天山地区的构造-热演化历史具有重要意义。本文对红云滩岩体进行黑云母Ar-Ar、锆石(U-Th)/He和磷灰石(U-Th)/He测年,并结合前人的锆石U-Pb测年结果,精细刻画出该岩体自形成以后经历的热演化过程,并据此识别出东天山红云滩地区发生过多期快速抬升冷却事件。黑云母阶段升温Ar-Ar法同位素定年得到的坪年龄为316.9±1.8Ma,单颗粒锆石和磷灰石(U-Th)/He同位素定年得到的平均年龄分别为213.7±9.6Ma和65.5±1.3Ma。热年代学数据及模拟结果表明东天山红云滩地区自晚古生代以来经历了3个快速冷却阶段,分别为:晚石炭世至早二叠世(ca.330~296Ma)、晚三叠世(222~220Ma)、晚白垩世(91~77Ma)。其中,晚石炭世至早二叠世的快速冷却作用是岩体侵位后与围岩热传导冷却及伴随天山造山隆升冷却综合作用的结果,晚三叠世和晚白垩世的两期快速冷却事件分别与羌塘-欧亚板块、Kohistan-Dras岛弧-拉萨地块碰撞的远程效应造成的东天山地区隆升作用有关。新生代以来,红云滩岩体所在的阿奇山-雅满苏地区构造活动相对较弱,未发生较为明显的隆升作用,与天山西段新生代的构造活动有着明显的差异。
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| 关 键 词： | 热演化历史 红云滩岩体 Ar-Ar测年 (U-Th)/He测年 东天山 |
| 收稿时间： | 2015/5/21 0:00:00 |
| 修稿时间： | 9/8/2015 12:00:00 AM |
Thermo-tectonic evolution history of Hongyuntan area, eastern Tianshan, Xinjiang: Constrained from Ar-Ar and (U-Th)/He dating |
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| SUN JingBo,SUN TengFei,CHEN Wen,YU Shun,YIN JiYuan,LI Chao,ZHANG Yan and LIU XinYu.Thermo-tectonic evolution history of Hongyuntan area, eastern Tianshan, Xinjiang: Constrained from Ar-Ar and (U-Th)/He dating[J].Acta Petrologica Sinica,2015,31(12):3732-3742. |
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| Authors: | SUN JingBo SUN TengFei CHEN Wen YU Shun YIN JiYuan LI Chao ZHANG Yan and LIU XinYu |
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| Institution: | State Key Laboratory for Continental Tectonics and Dynamics, Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,School of Earth Science and Resources, Chang'an University, Xi'an 710054, China,State Key Laboratory for Continental Tectonics and Dynamics, Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,State Key Laboratory for Continental Tectonics and Dynamics, Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,State Key Laboratory for Continental Tectonics and Dynamics, Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China,National Research Center for Geoanalysis, Beijing 100037, China,State Key Laboratory for Continental Tectonics and Dynamics, Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China and State Key Laboratory for Continental Tectonics and Dynamics, Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | Hongyuntan rock mass is located in the West Jueluotage area, eastern Tianshan Mountain, Xingjiang, NW China. Research on the thermal evolution history of this rock mass can provide important evidence for constraining the thermal history of the whole eastern Tianshan Mountain. This study reports new biotite Ar/Ar age, zircon and apatite (U-Th)/He ages of a same granodiorite sample from Hongyuntan rock mass, which, in conjunction with pre-existing zircon U-Pb age and inverse modeling simulations, constrain the thermal-tectonic history of Hongyuntan area. Biotite Ar-Ar dating yields a plateau age of 316.9±1.8Ma. Zircon and apatite (U-Th)/He dating yield weighted mean ages of 213.7±9.6Ma and 65.5±1.3Ma, respectively. Three fast cooling stages can be deduced by thermochronology data and inverse model simulation: Late Carboniferous epoch-Early Permian epoch (ca. 330~296Ma), Late Triassic epoch (222~220Ma) and Late Cretaceous epoch (91~77Ma). It is indicated that the first fast cooling stage was caused by conductive cooling after emplacement and uplift cooling company with Tianshan orogeny. Late Triassic and Late Cretaceous epoch fast cooling were related to the uplift of eastern Tianshan, which were caused by far-field effects of Qiangtang-Eurasia collision and Kohistan-Dras-Lhasa collision, respectively. Low-temperature thermochronology results indicate that Aqishan-Yamansu area, where Hongyuntan rock mass located in, was stable during Cenozoic. This is a significant different with the Cenozoic tectonic evolution of the western Tianshan. |
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| Keywords: | Thermal evolution history Hongyuntan intrusive rocks Ar-Ar dating (U-Th)/He dating Eastern Tianshan |
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