Elastic thickness, mechanical anisotropy and deformation of the southeastern Tibetan Plateau

Chen, Bin; Liu, Jianxin; Kaban, Mikhail K.; Sun, Yanan; Chen, Chao; Du, Jinsong

doi:10.1016/j.tecto.2014.09.007

Cited by 22 publications

(16 citation statements)

References 73 publications

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“…et al, 2014) across the LMS belt studies showed that a distinct low-velocity layer goes upward from lower crust to upper crust beneath the LMS belt, indicating that the lower crustal flow may thrust upwelling in this region. In addition, the effective elastic thickness (Te) (Fielding and McKenzie, 2012;Chen et al, 2014) showed that Te is generally lower in the LMS belt with a thickness of only 5-15 km compared to 30-40 km in the Sichuan Basin, suggesting that the lithosphere is weak beneath the LMS area. Combined with the observed thickened crust with high Vp/Vs ratio in this region, we speculate that the lower crust flow may accumulate in the lower crust and partly extrude into the upper crust under the LMS belt (Fig.…”

Section: Crustal Anisotropy and Deformationmentioning

confidence: 99%

Crustal structure and deformation under the Longmenshan and its surroundings revealed by receiver function data

Sun

Liu

Zhou

et al. 2015

Physics of the Earth and Planetary Interiors

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Section: Crustal Anisotropy and Deformationmentioning

confidence: 99%

Crustal structure and deformation under the Longmenshan and its surroundings revealed by receiver function data

Sun

Liu

Zhou

et al. 2015

Physics of the Earth and Planetary Interiors

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“…Furthermore, geophysical evidence suggests that the India-Eurasia collision continuously modifies and governs the lithospheric deformation in southeastern Tibet by long-distance northeastward subduction ( Fig. 12d) (Replumaz et al, 2004(Replumaz et al, , 2010Li et al, 2008;Hu et al, 2011;Chen et al, 2014;Huang et al, 2015). Thus, we conclude that this epoch dates a uniform exhumation and/or uplift across the southeastern Tibetan Plateau, in response to low-crustal flow and/or drainage reorganization (e.g.…”

Section: Geodynamics Of Mountain Building In the Se Tibetan Plateau Smentioning

confidence: 60%

“…12. (a) General structural features in the eastern Himalayan syntaxis, southeastern Tibetan Plateau to the Sichuan Basin. The deep structure is modified from Li et al (2008), Replumaz et al (2010), Chen et al (2014) and Huang et al (2015). rectangles and ellipses along boundary faults represent the correlation between cooling age measured in the Xichang Basin and cooling ages across the continental collision zone in eastern Tibet.…”

Section: Geodynamics Of Mountain Building In the Se Tibetan Plateau Smentioning

confidence: 99%

“…(b) Swath profile across eastern Tibet to the Sichuan Basin, indicating significant difference in elevation across the region and an uplifted Xichang Basin in comparison with the Sichuan Basin. 12d) (Replumaz et al, 2004(Replumaz et al, , 2010Li et al, 2008;Hu et al, 2011;Chen et al, 2014;Huang et al, 2015). (d) Regional interpretive geologic transect from the eastern Himalayan syntaxis to the Sichuan Basin.…”

Section: Geodynamics Of Mountain Building In the Se Tibetan Plateau Smentioning

confidence: 99%

“…(d) Regional interpretive geologic transect from the eastern Himalayan syntaxis to the Sichuan Basin. The deep structure is modified from Li et al (2008), Replumaz et al (2010), Chen et al (2014) and Huang et al (2015). Cenozoic (e.g.…”

Section: Geodynamics Of Mountain Building In the Se Tibetan Plateau Smentioning

confidence: 99%

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Tectonic uplift of the Xichang Basin (SETibetan Plateau) revealed by structural geology and thermochronology data

et al. 2017

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The Xichang Basin in southeastern Tibet provides crucial information about formation and tectonic processes affecting the eastern Tibetan Plateau. To determine when and how the uplift developed, we conducted detailed studies of structures and obtained thermochronology data from the Xichang Basin and its periphery. The Xichang Basin is characterized by gentle deformation of the strata, segmented by an E-vergent boundary thrust fault. Two stages of deformation, strike-slip followed by an E-W oriented shortening resulted in oblique shortening between the southeastern Tibetan Plateau and the Sichuan Basin. New apatite fission-track data interpreted together with (U-Th)/He data confirm a simple burial/heating and exhumation/cooling history across the Xichang Basin and its periphery. Subsidence and burial of the Xichang Basin peaked between 80-30 Ma, followed by mountain building with a protracted cooling starting at around 40-20 Ma, with rates of ca. 2.0-8.0°C Myr À1 (i.e. 0.1-0.3 mm year À1 ). Our data indicate that the Xichang Basin has experienced ca. 2.5-5 km of exhumation, much more intensive than the ca. 1-2 km of exhumation inferred for the southwestern Sichuan Basin. Restored balanced cross-sections of post-Late-Triassic strata along a ca. 250 km traverse indicate ca. 10-20% east-west shortening strain (i.e. ca. 20-30 km) at the southeastern Tibetan Plateau during Cenozoic time. Study of crustal thickening and erosion supports a tectonic shortening mechanism to account for the uplift of the Xichang Basin on the southeastern Tibetan Plateau.

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Quantifying the contribution of upper‐middle crustal shortening and lower crustal thickening to surface uplift in the south‐eastern Tibetan Plateau

Jiang

Gong

2021

Geological Journal

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Surface uplift occurs as a result of tectonic uplift related to crustal deformation and isostatic compensation due to surface erosion. To determine and quantify the key controlling factors responsible for surface uplift in the south‐eastern Tibetan Plateau, we calculated isostatic compensation using topographic data along five wide‐angle seismic profiles across the Chuandian Block, Indochina Block, and South China Plate, and examined the correlations between tectonic uplift and each crustal layer thickness. The average isostatic compensation caused by surface erosion is 340–480 m, which is approximately 13–26% of the total surface uplift. The geodynamic implications in relation to the Global Positioning System, focal mechanisms (P axes), seismic anisotropy (Pms splitting), and low‐velocity zones were also investigated. The low‐velocity zones with long‐distance southward extension seemed to be significantly reduced, and were divided into two branches by resistance from the inner zone of the Emeishan large igneous province (ELIP) when it is extending into the southern Chuandian Block. The lower crustal thickening related to low‐velocity zones reconstructed a partial crustal structure of the ELIP, and contributed at least 53–62% of the total surface uplift at the western branch, and almost 46–65% at the eastern branch. With the limitations imposed by the rigidity of the South China Plate and Indochina Block, the south‐eastern motion of the upper‐middle crust was strongly decoupled with southward lower crustal flow, as revealed by the unmatched pattern between P axes and Pms splitting. The south‐eastward motion of southern Chuandian Block resulted in upper‐crustal folding in the W–E direction, upper‐crustal thrusting in the N–S direction, and contributed approximately 9–28% of the total surface uplift in some locations. We emphasize the indispensability of upper‐crustal shortening in the frontal zone of the south‐eastern Tibetan Plateau and introduce the transitional characteristics of the southern Chuandian Block, from typical lower crustal flow to coupled crustal brittle shortening.

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Elastic thickness, mechanical anisotropy and deformation of the southeastern Tibetan Plateau

Cited by 22 publications

References 73 publications

Crustal structure and deformation under the Longmenshan and its surroundings revealed by receiver function data

Crustal structure and deformation under the Longmenshan and its surroundings revealed by receiver function data

Tectonic uplift of the Xichang Basin (SETibetan Plateau) revealed by structural geology and thermochronology data

Quantifying the contribution of upper‐middle crustal shortening and lower crustal thickening to surface uplift in the south‐eastern Tibetan Plateau

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