Crustal-scale wedge tectonics at the narrow boundary between the Tibetan Plateau and Ordos block

Tian, Xiaobo; Bai, Zhiming; Klemperer, S. L.; Liang, Xiaofeng; Liu, Zhen; Xiao, Wang; Yang, Xin; Wei, Yunhao; Zhu, Gaohua

doi:10.1016/j.epsl.2020.116700

Cited by 71 publications

(38 citation statements)

References 45 publications

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“…The episode of SRS development since circa 8 Ma is closely related to a well-documented kinematic reorganization of deformation within the northeastern Tibetan Plateau, where shortening is coupled with strike-slip motion (Craddock et al, 2011;Lease et al, 2011Lease et al, , 2012Tian et al, 2021) (Figure 9a). The emergence of the N-trending Jishi Shan thrust circa 13 Ma (Lease et al, 2011(Lease et al, , 2012 and the Liupan Shan thrust circa 10-8 Ma (Wang et al, 2011;Zheng et al, 2006) indicates the onset of E-W contraction in response to this reorganization.…”

Section: Late Miocene Renewed Evolution Of the Srs And Its Tectonic Omentioning

confidence: 89%

Initiation and Evolution of the Shanxi Rift System in North China: Evidence From Low‐Temperature Thermochronology in a Plate Reconstruction Framework

Tan

et al. 2021

Tectonics

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Rift initiation and evolution is a fundamental process in plate tectonics. When, how, and why a rift initiates and evolves, toward a rifted passive margin or a failed rift, are key questions in tectonics. Numerical and analog models have shown that a number of factors, including lithospheric thickness, rheology, heat flow, obliquity, heterogeneity, and strain rate, control the mode, sequence, and magnitude of continental rifting (e.g.

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Section: Late Miocene Renewed Evolution Of the Srs And Its Tectonic Omentioning

confidence: 89%

Initiation and Evolution of the Shanxi Rift System in North China: Evidence From Low‐Temperature Thermochronology in a Plate Reconstruction Framework

Tan

et al. 2021

Tectonics

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“…Sun, Jin, & Bai, 2003;Van Keken, Hacker, Syracuse, & Abers, 2011;Wei et al, 2001;Xu, Rondenay, & van der Hilst, 2007;Yao, van der Hilst, & De Hoop, 2006). However, other studies have pointed out the low crustal Vp/Vs ratios (<1.74) observed in this region are indicative of a felsic to intermediate crustal composition (Y. H. Li, Wang, et al, 2017;X. B. Tian et al, 2021).…”

Section: Baryan-har Block and Western Qinling Blockmentioning

confidence: 94%

“…The Ordos Block and adjacent areas (Figure 1), as the junction of the Tibetan Plateau, North China Block (NCB), and South China Block, contain the geological information about the interactions of different lithospheric blocks (Ren, 2003;Shi, Dong, & Hu, 2020;X. B. Tian et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The lithospheric effective elastic thickness and its tectonic implications in the Ordos Block and adjacent areas

et al. 2021

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The Ordos Block, located at the western edge of the North China Block, is a stable rigid block. It is characterized by inactive tectonic activity and rare earthquakes, while the south‐west margin of this block and adjacent areas present the opposite features. There is still considerable ambiguity with regard to the lithospheric mechanical strength in these areas. The effective elastic thickness (Te), widely used for comprehending the mechanism of cratonic deformation and lithospheric dynamics, is a proxy of the lithospheric strength. This study provided detailed two‐dimensional lithospheric Te spatial variations in the Ordos and adjacent areas by using coherence analysis of the topography and Bouguer anomaly. The result showed that the higher Te values in the Ordos Block varied from 80 to 100 km and implied that it is capable of strong rigidity. The lower Te values were distributed over the Qinling Block (20–45 km), the Qilian Block and Haiyuan arcuate tectonic region (20–40 km), as well as the Baryan‐Har Block (15–30 km). By comparing the Te values with the geophysical results, we believe that the higher Te value in the Ordos Block was supported not only by the crust, but also by the upper mantle. In contrast, the mechanical strength of the south‐west margin, especially the Baryan‐Har Block and western Qinling Block, was mainly borne by the brittle upper crust, but the tectonic activity and brittle failure likely resulted in a lower Te. Furthermore, we found that a large number of shallow earthquakes were located above low‐velocity and low‐resistivity layers, most of which probably occurred in the brittle upper crust with small mechanical strength.

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“…Moreover, Clark and Royden (2000) predicted that crustal materials flow northeastward around the rigid Sichuan Basin via numerical modeling (Figure 1). Since the publication of that study, a number of geophysical explorations have been performed in the northeastern Tibetan region (Bao et al., 2013, 2019; L. Chang et al., 2017; Deng et al., 2019; Guo et al., 2019; H. Li et al., 2014; Y. Li et al., 2018; Tian et al., 2014, 2021; X. Wang et al., 2017; Wei et al., 2017; Z. Zhang et al., 2013). However, whether crustal channel flow has actually occurred in the northeastern Tibet is still a subject of debate.…”

Section: Introductionmentioning

confidence: 99%

Growth of the Northeastern Tibetan Plateau Driven by Crustal Channel Flow: Evidence From High‐Resolution Ambient Noise Imaging

Zhao

Chen

et al. 2021

Geophysical Research Letters

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We present high‐resolution 3D images of the crustal S‐wave velocity structure beneath northeastern Tibet, via ambient noise imaging techniques. The data come from continuous recordings taken in one year by a seismic array consisting of 366 broadband stations in the study region. The results show a substantial and pervasive middle crust low‐velocity structure (<3.4 km/s) beneath the plateau region, which partially protrudes northeastward across the West Qinling fault, reflecting channel flow from inside the plateau and material extrusion in the periphery. The growth of the northeastern Tibetan Plateau in the study region is manifested in its northeastward expansion and thickening driven by crustal channel flow, accompanied with upper crust shortening.

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Crustal-scale wedge tectonics at the narrow boundary between the Tibetan Plateau and Ordos block

Cited by 71 publications

References 45 publications

Initiation and Evolution of the Shanxi Rift System in North China: Evidence From Low‐Temperature Thermochronology in a Plate Reconstruction Framework

Initiation and Evolution of the Shanxi Rift System in North China: Evidence From Low‐Temperature Thermochronology in a Plate Reconstruction Framework

The lithospheric effective elastic thickness and its tectonic implications in the Ordos Block and adjacent areas

Growth of the Northeastern Tibetan Plateau Driven by Crustal Channel Flow: Evidence From High‐Resolution Ambient Noise Imaging

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