Geodetic constraints on contemporary three-dimensional crustal deformation in the Laji Shan–Jishi Shan tectonic belt

IF 2.8 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geodesy and Geodynamics Pub Date : 2023-11-01 DOI:10.1016/j.geog.2023.03.006

Wenquan Zhuang, Duxin Cui, Ming Hao, Shangwu Song, Zhangjun Li

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引用次数: 1

Abstract

The Laji Shan–Jishi Shan tectonic belt (LJTB), located in the southern part of the northeastern Tibetan Plateau (NETP), is a tectonic window to reveal regional tectonic deformation in the NETP. However, its kinematics in the Holocene remains controversial. We obtain the latest and dense horizontal velocity field based on data collected from our newly constructed and existing GNSS stations. Combined with fault kinematics from geologic observations, we analyze the crustal deformation characteristics along the LJTB. The results show that: (1) The Laji Shan fault (LJF) is inactive, and the northwest-oriented Jishi Shan fault (JSF) exhibits a significant dextral and thrust slip. (2) The transpression along the arc-shaped LJTB accommodates deformation transformation between the dextral Riyue Shan fault and the sinistral west Qinling fault. (3) With the continuous pushing of the Indian plate, internal strains in the Tibetan Plateau are continuously transferred in the northeast via the LJTB as they are gradually dissipated near the LJTB and translated into significant crustal uplift in these regions.

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拉鸡山—鸡石山构造带当代三维地壳变形特征的大地测量约束

拉集山—积石山构造带(LJTB)位于青藏高原东北部(NETP)南部，是揭示该地区区域构造变形的构造窗口。然而，它在全新世的运动学仍然存在争议。我们根据新建和现有GNSS站收集的数据，获得最新和密集的水平速度场。结合地质观测的断层运动学，分析了LJTB沿线的地壳变形特征。结果表明:(1)拉鸡山断裂(LJF)不活动，西北向的鸡鸡山断裂(JSF)表现出明显的右旋和逆冲滑动。(2)沿弧形LJTB的逆压作用，容纳了日月山断裂右旋与西秦岭断裂左旋之间的变形转换。(3)随着印度板块的持续推动，青藏高原内部应变通过LJTB向东北方向持续传递，在LJTB附近逐渐消散，转化为显著的地壳隆升。

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来源期刊

Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

4.40

自引率

4.20%

发文量

566

审稿时长

69 days

期刊介绍： Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.