Late Oligocene Tectonic Uplift of the East Kunlun Shan: Expansion of the Northeastern Tibetan Plateau
Late Oligocene Tectonic Uplift of the East Kunlun Shan: Expansion of the Northeastern Tibetan Plateau
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DOI：
10.1029/2020gl091281
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发表时间：
2021-02-16
影响因子：
5.2
通讯作者：
Li, Youjuan
中科院分区：
文献类型：
--
作者：
Li, Chaopeng;Zheng, Dewen;Li, Youjuan
青藏高原东北部造山运动的时空格局对相互竞争的高原生长模式提供了重要的制约。我们的重点是东昆仑山（EKLS），在那里的新生代变形的时间仍然存在争议。七个磷灰石（U-Th）/He样品收集周围的EKLS中段的倾斜侵蚀面。一个类似于25马的斜坡断裂被确定为沿着古深度低于侵蚀面，我们解释为代表逆冲断层的发病在北方边缘的EKLS。已发表的南祁连山和北祁连山的热年代学资料显示，构造隆升的时间分别为15-18和8-10 Ma，明显晚于东昆仑造山带的逆冲断层活动。我们的研究支持青藏高原东北缘自晚渐新世以来从东昆仑造山带向北祁连山迁移的观点。简明语言摘要世界上最大的造山高原--青藏高原的发展是许多地球模型的中心。利用低温热年代学研究了青藏高原东北部东昆仑山的折返历史。磷灰石（UTh）/He热年代学是揭示地壳浅部折返作用的有效方法（
Spatial and temporal patterns of mountain building in the northeastern Tibetan Plateau provide important constraints on competing plateau growth models. We focus on the East Kunlun Shan (EKLS), where the timing of Cenozoic deformation remains controversial. Seven apatite (U-Th)/He samples were collected around a tilted erosion surface in the middle segment of the EKLS. A break in slope at similar to 25 Ma is identified along the paleodepth below the erosion surface, which we interpret to represent the onset of thrust faulting at northern margins of the EKLS. Published thermochronologic data from the South Qilian Shan and North Qilian Shan reveal tectonic uplift at 15-18 and 8-10 Ma, respectively, obviously later than thrust faulting in the EKLS. Our study supports that the northeastern margin of the Tibetan Plateau has migrated from the EKLS to North Qilian Shan since the late Oligocene.Plain Language Summary Development of the largest orogenic plateau in the world, the Tibetan Plateau, is at the center of many Earth models. We study the exhumation history of the East Kunlun Shan in the northeastern Tibetan Plateau using low-temperature thermochronology. Apatite (UTh)/He thermochronology serves as a useful method to reveal exhumation of the shallow crust (