Constraining Late Quaternary Crustal Shortening in the Eastern Qilian Shan From Deformed River Terraces
Constraining Late Quaternary Crustal Shortening in the Eastern Qilian Shan From Deformed River Terraces
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变形河阶地制约东祁连山晚第四纪地壳缩短
DOI：
10.1029/2020jb020631
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发表时间：
2020-09
影响因子：
3.9
通讯作者：
Zhang Huiping
中科院分区：
文献类型：
--
作者：
Zhong Yuezhi;Xiong Jianguo;Li Youli;Zheng Wenjun;Zhang Peizhen;Lu Honghua;Liu Qingri;Lei Jinghao;Chen Gan;Gong Zheng;Hu Xiu;Zhang Huiping
位于西藏东北部的祁连山，由于高原的传播，处于强烈的构造活动和地震运动之中。在东祁连山的山前，张掖盆地南部的桐子坝河向北流经，先后切割了祁连山前缘冲断系内的民乐-大营断裂和永固背斜两个平行构造。在这里，我们提供了这条河的七个层级阶地的详细记录，记录了两个构造的活动变形历史。根据估计的地壳到变形阶地的缩短距离和由AMS 14C和光激发发光(OSL)测年确定的阶地形成年龄，民乐-大岭断裂的水平滑动速率自16.7±1.8KYR以来被约束为1.4±0.5 mm/年，而跨越永固背斜的水平滑动速率在相似的时间框架内分别估计为1.3±0.4 mm/年。总体而言，穿越山前的缩短速率估计为2.7±0.6毫米/年。GPS数据显示该地区的现代缩短速率相似，这表明地壳缩短速率在现代尺度和104年尺度上可能是相当的。研究表明，自第四纪以来，东祁连山山前的地壳缩短速率高于西祁连山的地壳缩短速率。
The Qilian Shan, located in the northeastern Tibet, is under strong tectonic activity and earthquake motion due to the propagation of the plateau. At the mountain front of the eastern Qilian Shan, the Tongziba River, in the southern Zhangye Basin, flows northward and successively cuts the Minle‐Damaying Fault and the Yonggu Anticline, two parallel structures within the Frontal Thrust system of the Qilian Shan. Here we present a detailed record of seven strath terraces of this river that documents the history of active deformation of the two structures. Based on the estimated crustal shortening distance from the deformed terraces and the terrace formation age constrained by AMS 14C and optically stimulated luminescence (OSL) dating, a horizontal slip rate of 1.4 ± 0.5 mm/year of the Minle‐Damaying Fault is constrained since 16.7 ± 1.8 kyr, and a shortening rate of 1.3 ± 0.4 mm/year across the Yonggu Anticline has been estimated in a similar time frame, respectively. In total, the shortening rate across the mountain front is estimated to be 2.7 ± 0.6 mm/year. GPS data show a similar modern shortening rate in this area, which indicates the rate of crustal shortening may be comparable in the modern and 104‐year scales. Our study supports a higher crustal shortening rate along the mountain front of the eastern Qilian Shan than that of the western Qilian Shan since the Late Quaternary.
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影响因子：
8.3
作者：
TALMA, AS;VOGEL, JC
通讯作者：
VOGEL, JC
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影响因子：
2.9
作者：
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影响因子：
2.4
作者：
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通讯作者：
Geng Haopeng
影响因子：
3
作者：
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通讯作者：
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作者：
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通讯作者：
R. Hetzel;S. Niedermann;Mingxin Tao;P. Kubik;M. Strecker