10Be-derived sub-Milankovitch chronology of Late Pleistocene alluvial terraces along the piedmont of SW Tian Shan

Xu, Lei; Ran, Yongkang; Liu, Huaguo; Li, An

doi:10.1016/j.geomorph.2018.12.009

Cited by 13 publications

(14 citation statements)

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“…Then, we converted the slip rate to the shortening rate based on assumptions of fault dip. Xu et al (2019) discussed the long-term incision rate of the Kapin region kept consistent in the Late Quaternary. Therefore, for the T1 and T2 alluvial fans, we calculated the uplift rate of the hanging wall, which includes the vertical rate of faulting and the incision rate of the channel.…”

Section: Shortening Rate Calculationsmentioning

confidence: 95%

“…The majority of T3 fans are ~ 10 m higher than the channels on the hanging wall, and subgullies have eroded these on the original surface. By using terrestrial cosmogenic nuclide (TCN) 10 Be exposure dating methods, the T1 to T5 alluvial fans respectively formed at 63.7 +5.9 / −5.9 ka, 36.2 +3.4 / −3.4 to 40.9 +3.8 / −3.8 ka, 22.1 +5.1 / −4.7 ka, 5.8 +1.5 / −1.2 ka and 1.5 +0.8 / −0.6 ka (Xu et al 2019). We use these ages (Table 1) to calculate the shortening rate of the Kepingtage fault.…”

Section: Stages and Datings Of Alluvial Fansmentioning

confidence: 99%

Section: Shortening Rates Of the Sitesmentioning

confidence: 99%

“…We calculated shortening rates at the two sites using exposure ages of alluvial fan published in Xu et al (2019). At site A, the 10 Be exposure age, derived from depth profile dating of the xT4 fan, is 5.1 +0.7 / −0.9 ka (Xu et al 2019). The 10 Be exposure age of the oldest xT2 fan is 36.2 +3.4 / −3.4 ka based on 50-80 surficial amalgamated-gravel samples by terrestrial cosmogenic nuclide (TCN) dating (Xu et al 2019).…”

Section: Shortening Rates Of the Sitesmentioning

confidence: 99%

“…To characterize the fault displacement, we surveyed the topography of the faulted alluvial fans. We rely on previously published in situ cosmogenic 10 Be depth profiles and surface sample ages, (Xu et al 2019) to constrain the timing of the abandonment of the alluvial fans and determine shortening rates. We focused on the segmentation features of the Kepingtage fault and the significance of the Piqiang fault deformation reflected by the segmentation features.…”

Section: Introductionmentioning

confidence: 99%

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Segmentation of the Kepingtage thrust fault based on paleoearthquake ruptures, southwestern Tianshan, China

Ran

Gomez

et al. 2020

Nat Hazards

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Decreasing deformation rates across the southern Tianshan have led to different seismogenic mechanisms and different proposed models to explain the orogen-scale fault kinematics. In this study, we focus on the segmentation of the Kepingtage fault by studying variations in the total offset and shortening rates of the Kepingtage fault along the southern front of the Tianshan. We used fault scarp mapping and trench excavations to assess fault segmentation and deformation on the Kepingtage fault. Our results indicate there are different shortening rates on the western (2.5-2.7 mm/year) versus the eastern segments (~ 0.3 mm/year), which are separated by the Piqiang tear fault. The decrease in shortening rates is not gradual; instead, it decreases sharply from west to east at the Piqiang fault. These segmentation boundaries are also supported by geodetic data and balanced structural restorations. Our data support a model where strike-slip faults accommodate step-changes in the deformation rates and the earthquake risks from west to east across the Tianshan.

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Section: Shortening Rate Calculationsmentioning

confidence: 95%

Section: Stages and Datings Of Alluvial Fansmentioning

confidence: 99%