| 青藏高原东缘峨眉山新生代加速抬升剥蚀作用 |
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| 引用本文： | 周政,吴娟,王国芝,邓江红,邓斌,罗强,姜磊,刘树根,邓宾.青藏高原东缘峨眉山新生代加速抬升剥蚀作用[J].地球物理学报,2020,63(4):1370-1385. |
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| 作者姓名： | 周政 吴娟 王国芝 邓江红 邓斌 罗强 姜磊 刘树根 邓宾 |
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| 作者单位： | 1. 成都理工大学“油气藏地质及开发工程”国家重点实验室, 成都 610059;2. 图宾根大学地球科学系, 图宾根 72074 |
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| 基金项目： | 自然科学基金（41402119，2014JQ0057，41472107，41230313）和地质学国家级实验教学示范中心-成都理工大学峨眉山教学实习基地建设经费联合资助. |
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| 摘 要： | 本文通过峨眉山基底卷入构造带低温热年代学(磷灰石和锆石裂变径迹、锆石(U-Th)/He)研究,结合典型构造-热结构特征诠释峨眉山晚中-新生代冲断扩展变形与热年代学耦合性.峨眉山磷灰石裂变径迹(AFT)和锆石(U-Th)/He(ZHe)年龄值分别为4~30Ma和16~118Ma.ZHe年龄与海拔高程关系揭示出ZHe系统抬升剥蚀残存的部分滞留带(PRZ).低温热年代学年龄与峨眉山构造分带性具有明显相关性特征:万年寺逆断层上盘基底卷入构造带AFT年龄普遍小于10Ma,万年寺逆断层下盘扩展变形带AFT年龄普遍大于10 Ma;且空间上AFT年龄与断裂带具有明显相关性,它揭示出峨眉山扩展变形带中新世晚期以来断层冲断缩短构造活动.低温热年代学热史模拟揭示峨眉山构造带晚白垩世以来的多阶段性加速抬升剥蚀过程,基底卷入构造带岩石隆升幅度大约达到7~8km,渐新世以来抬升剥蚀速率达0.2~0.4mm·a-1,其新生代多阶段性构造隆升动力学与青藏高原多板块间碰撞过程及其始新世大规模物质东向扩展过程密切相关.
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| 关 键 词： | 低温热年代学 抬升剥蚀 峨眉山 青藏高原东缘 |
| 收稿时间： | 2019-05-15 |
Cenozoic accelerated erosion of the Emeishan,eastern margin of Tibetan Plateau |
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| ZHOU Zheng,WU Juan,WANG GuoZhi,DENG JiangHong,DENG Bin,LUO Qiang,JIANG Lei,LIU ShuGen,DENG Bin.Cenozoic accelerated erosion of the Emeishan,eastern margin of Tibetan Plateau[J].Chinese Journal of Geophysics,2020,63(4):1370-1385. |
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| Authors: | ZHOU Zheng WU Juan WANG GuoZhi DENG JiangHong DENG Bin LUO Qiang JIANG Lei LIU ShuGen DENG Bin |
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| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology, Chengdu 610059, China;2. Institute für Geowissenschaften, Universität Tübingen, Tübingen 72074, Germany |
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| Abstract: | Based on low-temperature thermochronology data, e.g., AFT, ZHe and ZFT, it suggests a coupling correlation between the deformation and cooling processes and thermochronology data at the Emeishan area, eastern margin of Tibetan Plateau. AFT and ZHe ages range from 4 Ma to 30 Ma, and from 16 Ma to 118 Ma, respectively. In particular, there is a distinct relationship between ZHe ages and their elevation, indicating of zircon paleo-PRZ here. Furthermore, the AFT ages at hanging wall of the Wanniansi fault are younger than 10 Ma, in contrast to ages larger than 10 Ma at the footwall, indicating of foreward thrusting and erosion process occurred at the Emeishan area. The thermal histories modeled with AFT, ZHe and ZFT data suggest accelerated erosion occurred after Late Cretaceous in the Emeishan, with rate of 0.2~0.4 mm·a-1 after Oligocene, and there is a total magnitude of rock uplift with 7~8 km at the basement-involved deformation zone. We thus argued that the mount-building processes and their uplift dynamics in the Emeishan should be attributed to the northeastward continental subduction of the Lhasa and Qiangtang blocks and initial extrusion of the eastern Asian block since the mid-Eocene across the eastern Tibetan Plateau. |
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| Keywords: | Low-temperature thermochronology Exhumation and erosion Emeishan SE Tibetan Plateau |
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