Nonrigid Bookshelf Kinematics of Northeastern Tibet: Constrains from Fault Slip Rates around the Qinghai Lake and Chaka-Gonghe Basins
Nonrigid Bookshelf Kinematics of Northeastern Tibet: Constrains from Fault Slip Rates around the Qinghai Lake and Chaka-Gonghe Basins
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藏东北部非刚性书架运动学：青海湖及茶卡-共和盆地断层滑移速率的约束
DOI：
10.2113/2021/4115729
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发表时间：
2021-04
期刊：
影响因子：
2.4
通讯作者：
Huang Rong
中科院分区：
文献类型：
--
作者：
Chen Gan;Ai Ming;Zheng Wenjun;Bi Haiyun;Liu Jinrui;Zhang Yipeng;Ge Weipeng;Zhang Dongli;Huang Rong
鄂拉山断裂（ELSF）和青海南山断裂（QHNF）是发育在青海湖和茶卡-共和盆地周围的两条主要断裂，对研究青藏高原东北部内部的变形模式具有重要意义。然而，他们的晚更新世滑动率仍然很差的约束。在这项研究中，我们结合联合收割机高分辨率地形获得无人机（UAV）和地貌测年计算的滑动速率的两个故障。我们访问了ELSF中部和QHNF西部，并测量了移位的梯田和河道。我们收集了10 Be样品的梯田的表面上，以限制废弃年龄。鄂拉山断裂中段的右行走滑速率为2.6± 1.2mm/a。鄂拉山断裂和青海南山断裂晚更新世以来的隆升速率分别为0.4± 0.04mm/yr和0.2± 0.03mm/yr。将地质速率与最新公布的全球定位系统（GPS）速率进行比较，发现青海湖和茶卡-共和盆地周边主要走滑断裂从晚更新世至今的滑动速率基本一致。将东昆仑-海原断裂带之间主要断裂的地质滑动速率相加，得到的总体NE向缩短速率为3.4mm/yr，小于大地缩短速率（4.9 ~ 6.4mm/yr），表明分布变形对区域变形起着重要的调节作用。通过分析盆地周边主要断裂的几何学和运动学特征，认为藏北东部的运动学变形是一个逆时针旋转（~0.8° Myr-1）和分布逆冲的非刚性书架模型。
The Elashan fault (ELSF) and Qinghainanshan fault (QHNF), two major faults developed around the Qinghai Lake and Chaka-Gonghe basins, are of great importance for investigating the deformation model of the internal northeastern Tibetan Plateau. However, their late Pleistocene slip rates remain poorly constrained. In this study, we combine high-resolution topography acquired from unmanned aerial vehicles (UAV) and geomorphological dating to calculate the slip rates of the two faults. We visited the central ELSF and western QHNF and measured displaced terraces and stream channels. We collected 10Be samples on the surface of terraces to constrain the abandonment ages. The dextral slip rate of the central segment of the Elashan fault is estimated to be 2.6±1.2 mm/yr. The uplift rates since the late Pleistocene of the Elashan and Qinghainanshan faults are 0.4±0.04 mm/yr and 0.2±0.03 mm/yr, respectively. Comparing the geological rates with the newly published global positioning system (GPS) rates, we find that the slip rates of the major strike-slip faults around the Qinghai Lake and Chaka-Gonghe basins are approximately consistent from the late Pleistocene to the present day. The overall NE shortening rates by summing up the geological slip rates on major faults between the East Kunlun and Haiyuan faults are ~3.4 mm/yr, smaller than the geodetic shortening rates (~4.9 to 6.4 mm/yr), indicating that distributed deformation plays an important role in accommodating the regional deformation. By analyzing the geometrical and kinematic characteristics of the major faults surrounding the basins, we suggest that the kinematic deformation of the internal northeastern Tibet is a nonrigid bookshelf model that consists of counterclockwise rotation (~0.8° Myr-1) and distributed thrusting.
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