River piracy and its geomorphic effects in the northern Qilian Shan, northeastern Qinghai-Tibet Plateau

Su, Qi; Lu, Huayu; Zhang, Huiping; Hong, Xie

doi:10.1016/j.palaeo.2022.111147

Cited by 6 publications

(2 citation statements)

References 76 publications

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“…Thus our ∼420 ka river incision age for the Beida River that led to abandonment of the Jiayuguan Qf1 alluvial fan is compatible with the river capture analysis reported by Su et al. (2022) and the extremely low sedimentation rate during ∼600 to ∼300 ka of the Beida River at the outlet of the Qilian Shan (X. Liu et al., 2022).…”

Section: Resultssupporting

confidence: 90%

“…The exposure ages derived from the depth profile and surficial gravels collected on different alluvial fan Qf1 surfaces coincide within uncertainty bounds, lending confidence that the sediments represent a contemporaneous alluvial fan complex. Additionally, river profile inversion data and satellite imagery interpretations by Su et al (2022) indicate that the Hongshuiba River captured the upper Beida River system at ∼350 ka, suggesting that the Beida River fluvial/alluvial system existed prior to ∼350 ka. Thus our ∼420 ka river incision age for the Beida River that led to abandonment of the Jiayuguan Qf1 alluvial fan is compatible with the river capture analysis reported by Su et al (2022) and the extremely low sedimentation rate during ∼600 to ∼300 ka of the Beida River at the outlet of the Qilian Shan (X.…”

Section: Table 1 Cosmogenic 10 Be Dating Resultsmentioning

confidence: 99%

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Diachronous Quaternary Development of the Jiayuguan Fault and Implications for Strain Compartmentalization and Modern Earthquake Hazards in the NW Hexi Corridor, China

Yang,

Li,

Cunningham

et al. 2023

Tectonics

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The NNW‐trending Jiayuguan Fault (JYGF) is an actively developing thrust fault that delimits the SW margin of Jiayuguan, a major industrial city in the northwestern Hexi Corridor, China. In this study, we document the geometry, kinematics, and slip rates of the JYGF based on analysis of satellite imagery, low‐altitude photogrammetry, field observations, paleo‐seismic trenching, and Quaternary dating. The JYGF hanging‐wall contains a NE‐vergent asymmetric anticline of Cretaceous redbeds unconformably overlain by faulted, tilted and folded alluvial fan and fluvial terrace surfaces. Subsidiary fault scarps are associated with anticlinal flexure and contractional strain. The vertical uplift and crustal shortening rates are both ∼0.1 mm/a since ∼420 ka and geomorphic markers and dated landforms indicate southeastward fault propagation and hanging‐wall uplift from the Heishan toward the modern Beida River channel. The NW end of the fault appears to connect with the Altyn‐Tagh‐Heishan‐Jinta'Nanshan sinistral strike‐slip fault array suggesting that the JYGF is one of several parallel, splay faults that transfer strike‐slip motion to active folding and thrusting in the region. We relocate the 1992 Ms 5.4 earthquake epicenter using the NonLinLoc method and suggest that the JYGF may link southeastward with Quaternary‐active faults and folds in the Wenshushan. A seismic rupture along the total fault length of 25–40 km for the JYGF‐Wenshushan deforming belt corresponds to a potential earthquake magnitude in the 6.6–7.0 range. Compartmentalized faulting and folding in the NW–most Hexi Corridor defines a triangular block of active deformation where NE‐directed contractional deformation of the Qilian Shan foreland interacts with E‐W left‐lateral displacement along the Altyn‐Tagh‐Heishan‐Jinta'Nanshan sinistral strike‐slip system.

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Section: Resultssupporting

confidence: 90%

Section: Table 1 Cosmogenic 10 Be Dating Resultsmentioning

confidence: 99%