Growth Model and Tectonic Significance of the Guman Fold Along the Western Kunlun Mountain Front (Xinjiang, China) Derived From Terrace Deformation and Seismic Data

Xu, Jianhong; Chen, Jie; Arrowsmith, J Ramón; Li, Tao; Zhang, Boxuan; Di, Ning; Pang, Wei

doi:10.3389/feart.2020.590043

Cited by 10 publications

(4 citation statements)

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“…Several authors suggested that the slip accommodated by these structures is transferred forward toward the foreland on this upper detachment. Such deformation could then be accommodated by the emergent Mazar Tagh thrust, ∼200 km further north from the topographic front of the WKR (Figure 1d, e.g., Chen et al., 2022; Guilbaud et al., 2017; Laborde et al., 2019; Lu et al., 2016; Wittlinger et al., 2004; Xu et al., 2020).…”

Section: Geological Contextmentioning

confidence: 99%

“…This part of the belt has a length of ∼350 km and a width of ∼140 km, with altitudes up to ∼6,400 m in the hinterland, ∼4,000–5,000 m higher than the average elevation of the adjacent Tarim Basin. It also has the specificity of having a present‐day deformation front deported far north into this basin, ∼200 km away from the topographic mountain front (e.g., Guilbaud et al., 2017; Laborde et al., 2019; Lu et al., 2016; Wittlinger et al., 2004; Xu et al., 2020, Figure 1d).…”

Section: Geological Contextmentioning

confidence: 99%

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Kinematics of Cenozoic Shortening of the Hotan Anticline Along the Northwestern Margin of the Tibetan Plateau (Western Kunlun, China)

et al. 2022

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Kinematic constraints on the Cenozoic deformation along the northwestern edge of the Tibetan Plateau remain limited. Combining surface geological data and seismic profiles, we document the structural geometry and kinematics of the large‐scale east‐west striking Hotan anticline, along the foothills of the Western Kunlun Range. Four new balanced cross sections are constructed, and the temporal evolution of deformation is deciphered from the exceptionally well‐imaged growth strata at the front of the fold. This anticline results from a broad fault‐bend fold, subsequently deformed by a footwall duplex. The total shortening across the whole structure is relatively constant along strike, from ∼40 to ∼35 km. However, the shortening accommodated by the duplex varies laterally from ∼50–40% to 0% of the total shortening. Two distinct successive patterns of growth strata are recognized and are interpreted to be representative of deformation on the ramp anticline, followed by deformation on the duplex. The onset of deformation initiated by ∼16 Ma. Deformation of the underlying duplex began at ∼12 Ma to the west and subsequently propagated eastward. From these results, we determine a shortening rate of ∼5 mm/yr from ∼16 to ∼8–9 Ma across the Hotan thrust system, followed by a significant decrease in shortening rate, possibly down to <0.5 mm/yr. We explore the significance of this deceleration of deformation at the scale of the Western Kunlun foothills and at a broader regional scale as it may point to a regional kinematic reorganization by the late Miocene.

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Section: Geological Contextmentioning

confidence: 99%

Section: Geological Contextmentioning

confidence: 99%

Kinematics of Cenozoic Shortening of the Hotan Anticline Along the Northwestern Margin of the Tibetan Plateau (Western Kunlun, China)

et al. 2022

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“…fluvial terraces, fold scarps) together with the proposed underlying structural geometry; their uncertainties have also been considered in several studies (e.g. Thompson et al, 2002;Davis et al, 2005;Bird, 2007;Zechar and Frankel, 2009;Amos et al, 2010;Li et al, 2013;Xu et al, 2020). Subsurface fault geometry -a critical element for constraining geological slip -is mostly simplified as a single planar fault, which can thus lead to large uncertainties (e.g.…”

Section: Introductionmentioning

confidence: 99%

How do differences in interpreting seismic images affect estimates of geological slip rates?

Hu¹

2023

Preprint

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<div> <div> <div> <div> <p>Uncertainties of geological structural geometry constructed based on seismic reflections can stem from data acquisition, processing, analysis, or interpretation. Uncertainties arising from structural interpretations and subsequent estimates of geological slip have been particularly less quantified and discussed. To illustrate the implications of interpretation uncertainties for seismic potential and structural evolution, I use an example of a shear fault-bend fold in the central Himalaya. I apply a simple solution from the kinematic model of shear fault-bend folding to resolve the geological input slip of given structure and then compare the result with a previous study to show how differences in structural interpretations could impact dependent conclusions. The findings show that only a little variance in interpretations owing to subjectivity or an unclear seismic image could yield geological slip rates differing by up to about 10 mm/yr, resulting in significantly different scenarios of seismic potential. To reduce unavoidable subjectivity, this study also suggests that the epistemic uncertainty in raw data should be included in interpretations and conclusions.</p> </div> </div> </div> </div>

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Section: Introductionmentioning

confidence: 99%

How do differences in interpreting seismic images affect estimates of geological slip rates?

2022

Solid Earth

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Abstract. Uncertainties of geological structural geometry constructed based on seismic reflections can stem from data acquisition, processing, analysis, or interpretation. Uncertainties arising from structural interpretations and subsequent estimates of geological slip have been particularly less quantified and discussed. To illustrate the implications of interpretation uncertainties for seismic potential and structural evolution, I use an example of a shear fault-bend fold in the central Himalaya. I apply a simple solution from the kinematic model of shear fault-bend folding to resolve the geological input slip of given structure and then compare the result with a previous study to show how differences in structural interpretations could impact dependent conclusions. The findings show that only a little variance in interpretations owing to subjectivity or an unclear seismic image could yield geological slip rates differing by up to ∼ 10 mm yr−1, resulting in significantly different scenarios of seismic potential. To reduce unavoidable subjectivity, this study also suggests that the epistemic uncertainty in raw data should be included in interpretations and conclusions.

show abstract

Growth Model and Tectonic Significance of the Guman Fold Along the Western Kunlun Mountain Front (Xinjiang, China) Derived From Terrace Deformation and Seismic Data

Cited by 10 publications

References 73 publications

Kinematics of Cenozoic Shortening of the Hotan Anticline Along the Northwestern Margin of the Tibetan Plateau (Western Kunlun, China)

Kinematics of Cenozoic Shortening of the Hotan Anticline Along the Northwestern Margin of the Tibetan Plateau (Western Kunlun, China)

How do differences in interpreting seismic images affect estimates of geological slip rates?

How do differences in interpreting seismic images affect estimates of geological slip rates?

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