The Uplift History of the Haiyuan-Liupan Shan Region Northeast of the Present Tibetan Plateau: Integrated Constraint from Stratigraphy and Thermochronology
The Uplift History of the Haiyuan-Liupan Shan Region Northeast of the Present Tibetan Plateau: Integrated Constraint from Stratigraphy and Thermochronology
复制标题
今青藏高原东北部海原—六盘山地区的隆升历史：地层学和热年代学的综合制约
DOI：
10.1086/660190
复制
发表时间：
2011-07-01
影响因子：
1.8
通讯作者：
Xiao, Jun
中科院分区：
文献类型：
--
作者：
Lin, Xiubin;Chen, Hanlin;Xiao, Jun
海原—六盘山划定青藏高原东北缘。我们展示了新地层调查、磷灰石裂变径迹分析以及与该地区结构结构相关的相关热历史模型的综合结果。这些限制因素使我们能够深入了解高原向北扩展的时间：(1)晚侏罗世到早白垩世局部地形的形成和侵蚀的加剧，代表了拉萨-羌塘与南亚边缘碰撞所产生的复杂的、区域性的、远场变形响应的局部因素； (2) 可能是白垩纪晚期折返的证据，但鉴于该区间存在区域沉积间隙，这一点是不确定的； (3) 始新世地貌的产生是对印度-亚洲碰撞的远场影响的第一个可能的反应，并且与中国西北部这一地区所认识到的更广泛的区域事件有关； (4)最新的变形事件在中新世早期强烈传播到海原-六盘山，在中新世晚期强度增加，并可能在第四纪再次增加。对遥远板块边界事件的明显响应的历时性表明，结构预处理本身不足以解释这种远场变形，这表明地壳下的构造结构可能在青藏高原北部的应力转移中发挥了作用。
The Haiyuan-Liupan Shan delimits the northeastern margin of the Tibetan Plateau. We present the integrated results of new stratigraphic investigations, apatite fission track analyses, and related thermal history modeling tied to the structural fabric of this region. These constraints provide insight into the timing of northward propagation of the plateau with (1) local relief creation and enhanced erosion in the latest Jurassic to earliest Cretaceous, representing the local element of a complex, regional, far-field deformation response to the Lhasa-Qiangtang collision with the south Asian margin; (2) evidence for likely Late Cretaceous exhumation, but this is uncertain given the regional sedimentary gap that exists across this interval; (3) Eocene relief generation as a first likely response to far-field effects of the India-Asia collision and related to wider regional events recognized in this part of northwestern China; and (4) the latest deformation episode propagating strongly into the Haiyuan-Liupan Shan in the early Miocene, increasing in intensity in the later Miocene and possibly again in the Quaternary. The diachronous nature of the apparent responses to distant plate-boundary events demonstrates that structural preconditioning on its own is inadequate to account for this far-field deformation, suggesting that subcrustal tectonic architecture may play a role in the transfer of stress north of the Tibetan Plateau.