祁连山西端大雪山北山断裂晚第四纪构造变形特征

萧千皓; 袁道阳; 文亚猛; 于锦超; 陈艳文; 孙浩

doi:10.3799/dqkx.2025.235

Volume 51 Issue 1

Jan. 2026

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Article Navigation > Earth Science > 2026 > 51(1): 329-344

Xiao Qianhao, Yuan Daoyang, Wen Yameng, Yu Jinchao, Chen Yanwen, Sun Hao, 2026. Late Quaternary Tectonic Deformation Characteristics of Daxue Shan Bei Shan Fault in the Western Qilian Mountains. Earth Science, 51(1): 329-344. doi: 10.3799/dqkx.2025.235

Citation:

Xiao Qianhao, Yuan Daoyang, Wen Yameng, Yu Jinchao, Chen Yanwen, Sun Hao, 2026. Late Quaternary Tectonic Deformation Characteristics of Daxue Shan Bei Shan Fault in the Western Qilian Mountains. Earth Science, 51(1): 329-344. doi: 10.3799/dqkx.2025.235

Citation:

Xiao Qianhao, Yuan Daoyang, Wen Yameng, Yu Jinchao, Chen Yanwen, Sun Hao, 2026. Late Quaternary Tectonic Deformation Characteristics of Daxue Shan Bei Shan Fault in the Western Qilian Mountains. Earth Science, 51(1): 329-344. doi: 10.3799/dqkx.2025.235

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Late Quaternary Tectonic Deformation Characteristics of Daxue Shan Bei Shan Fault in the Western Qilian Mountains

doi: 10.3799/dqkx.2025.235

Xiao Qianhao^{1
,
,},
Yuan Daoyang^{1
,
,},
Wen Yameng^{1, 2},
Yu Jinchao¹,
Chen Yanwen¹,
Sun Hao¹

1.
School of Earth Sciences, Lanzhou University, Lanzhou 730000, China
2.
School of Geography and Tourism, Qilu Normal University, Jinan 250000, China

Received Date: 2025-07-30
Publish Date: 2026-01-25

Abstract

Abstract

Located at the northern edge of the Qinghai-Tibet Plateau and the western end of the Qilian Mountains, the Shibaocheng-Changma Basin and its surrounding areas are characterized by numerous active tectonic features and intense tectonic activity. Among these, the Shibaocheng-Yingzuishan Fault Zone, as the largest reverse fault-fold belt in the basin, exhibits complex tectonic deformation patterns and distinct fault dislocation landforms. This region is an ideal area for studying basin-mountain tectonic deformation and its deep-shallow tectonic relationships, as well as for understanding the tectonic conversion relationships between different faults and crustal shortening patterns. This study employs high-precision unmanned aerial vehicle (UAV) Structure-from-Motion (SfM) photogrammetry techniques, combined with field survey results, to conduct a detailed interpretation of faulted landforms. It analyzes the latest activity characteristics and tectonic deformation patterns of the Daxue Shan Bei Shan Fault within the eastern segment of the Yingzuishan Fault. It also employs cosmogenic nuclide dating methods to age-date key faulted landforms, and further calculates the Late Quaternary deformation rates through analyses of the deformation patterns and deformation amounts of multi-level terraces and their corresponding landform surfaces. The research results indicate that the Daxue Shan Bei Shan Fault consists of two rows of faults. The thrusting action of the front-edge fault has formed multiple reverse fault-fold belts within the basin, while the rear-edge fault has developed bend-moment normal faults associated with fold, forming a typical reverse fault-normal fold combination. Fault activity caused the front-edge fault (Lujiaai segment) terraces T₃ and T₄ to experience vertical displacements of (6.56±0.34) m and (16.09±1.13) m, respectively. Based on terrace age calculations, the vertical slip rate of this fault segment is approximately (0.15±0.01) mm/a, with a horizontal shortening rate of approximately (0.12±0.02) mm/a and the overall thrust rate is approximately (0.19±0.03) mm/a. The deep slip surface extends southward to Daxue Shan Fault at a depth of approximately (2.7±0.5) km, forming a typical thin-skinned reverse fault-fold deformation zone, which is the result of the fault system's forward-extending compression and expansion into the basin interior.
- Daxue Shan Bei Shan Fault,
- unmanned aerial vehicle image,
- reverse fault fold belt,
- bending-moment normal fault,
- structural geology

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Late Quaternary Tectonic Deformation Characteristics of Daxue Shan Bei Shan Fault in the Western Qilian Mountains

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