Uplift Mechanism of the Highest Mountains at Eastern Himalayan Syntaxis Revealed by In Situ Dense Gravimetry

She, Yawen; Fu, Guangyu

doi:10.1029/2020gl091208

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…Gravity data have been widely used to study the crustal structure beneath the Tibetan Plateau, especially the Moho relief (e.g., Xu et al., 2017; Zhao et al., 2020). However, only a few studies are reported about the upper mantle structure inferred from gravity data (e.g., Ravikumar et al., 2020; She & Fu, 2020). We use our inversion method and the EIGEN‐6C4 gravity data to obtain the mantle density variations beneath the Tibetan Plateau.…”

Section: Application To the Tibetan Plateaumentioning

confidence: 99%

Constrained Gravity Inversion With Adaptive Inversion Grid Refinement in Spherical Coordinates and Its Application to Mantle Structure Beneath Tibetan Plateau

et al. 2022

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We develop a novel gravity inversion algorithm in spherical coordinates based on adaptive inversion mesh refinement and multiphysical parameter constraints. The inversion mesh is discretized into tesseroids (spherical prisms) to take the curvature of the Earth into account. To reduce the number of unknowns and computational cost, the inversion mesh is adaptively refined according to the spatial variation of parameters at each iteration. Wavelet compression is used to further reduce the computational requirement. Besides, to alleviate the nonuniqueness of inversion, the algorithm is capable of incorporating a priori models from other geophysical methods via cross‐gradient coupling and/or direct parameter coupling. For cross‐gradient coupling, the vector product of spatial gradients of two model parameters is included in the objective function. For direct parameter coupling, an a priori model is converted to a density model using the relation between two physical properties, which is then used as the initial and reference model in the inversion. A synthetic example is presented to demonstrate the effectiveness of our inversion method. Finally, we invert the gravity data over the Tibetan Plateau to obtain the density variations in the upper mantle, with a global S wave tomographic model used as a constraint. The inversion model shows that the mantle lithosphere beneath the Himalayan collision zone varies from west to east. Low‐density anomalies are observed beneath the southern and the northern Tibetan Plateau, which are consistent with published low‐velocity anomalies and magmatism distributions, possibly indicating two asthenospheric upwellings.

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Section: Application To the Tibetan Plateaumentioning

confidence: 99%

Constrained Gravity Inversion With Adaptive Inversion Grid Refinement in Spherical Coordinates and Its Application to Mantle Structure Beneath Tibetan Plateau

et al. 2022

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“…We adopt the multi‐source data joint inversion method (She & Fu, 2020, see Supporting Information) to invert the crustal structure along the profile. We construct the initial model based on S‐wave velocity tomography results (Li et al, 2002, 2012; Zhao et al, 2003).…”

Section: Data Gravity Anomaly and Crustal Structurementioning

confidence: 99%

Crustal density structure and flexure mechanism of the Tarim Basin, China, constrained by latest in situ gravity observations

Daiqin

Wang

et al. 2022

Terra Nova

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The collision of the Eurasian plate by the Indian plate caused extensive deformation in the Asian interior (Molnar & Tapponnier, 1975), resulting in the uplift and outward extrusion of the Tibetan Plateau and the reactivation of the ancient orogenic belts, such as the South Tian Shan and the West Kunlun (Avouac et al., 1993;Yin & Harrison, 2000). The Tarim Basin lies between the above orogens (Figure 1). Numerous deep and large fault zones are distributed in this basin (Lyu et al., 2019), indicating that the region has undergone a complex and long-term tectonic evolution process. It is thus an ideal area for studying the formation of piedmont basin and the geodynamics of the plate convergence.At present, the composition of deep bedrock materials in the Tarim Basin remains uncertain. Some scholars believe that the material of the deep structure of the entire basin may be uniform (Li et al., 2020;Zhang et al., 2013). Others argue that the basin may be split by south and north blocks, because of the abruptly high thermal and magnetotelluric anomalies in the middle-south area (Gao et al., 2013;Qiu et al., 2022;Zhang et al., 2020). The crustal density structure can be inverted from the gravity anomaly to explore the deep material composition. Furthermore, the tectonic evolution

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“…The crustal density structure of the profiles was inversed by using the Gravity/Magnetic Model Software provided from Northwest Geophysical Associates with BGAs data as input (Figure 3). The detailed calculation method is the same as described in Supporting Information S1 of She and Fu (2020). Our initial crustal density model is based on the S wave velocity structure in this region obtained from the combined surface wave dispersion and receiver functions of Zheng et al (2016).…”

Section: Moho Changes and Density Structures In Western Yunnanmentioning

confidence: 99%

Gravity Anomalies and Lithospheric Flexure in Western Yunnan, China, Deduced From a New Dense Gravimetry

Zhao

She

2021

Geophysical Research Letters

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We conducted a dense gravity/GNSS survey in western Yunnan, China, and improved the precision of Bouguer gravity anomalies (BGAs) and Free‐air gravity anomalies (FGAs) by about 50 mGal. The BGAs showed that there was no significant BGAs abnormal change over the whole study area, and the density structure of BGAs inversion shows low‐density regions at 20–40 km depth beneath Tengchong and its surrounding areas. Meanwhile, we calculated the loading ratio of the lithosphere in western Yunnan based on merged FGAs using the gravity admittance method. The resulting ratios show that the lithospheric flexure in this region results from a combination of the surface, the internal crust, and the mantle, with the internal crust dominating. Combined with other geophysical results, we speculate that the origin of Tengchong volcanoes is not large‐scale mantle upwelling, but limited mantle material rising along the fracture in the process of material migration in the middle‐lower crust.

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Uplift Mechanism of the Highest Mountains at Eastern Himalayan Syntaxis Revealed by In Situ Dense Gravimetry

Cited by 10 publications

References 33 publications

Constrained Gravity Inversion With Adaptive Inversion Grid Refinement in Spherical Coordinates and Its Application to Mantle Structure Beneath Tibetan Plateau

Constrained Gravity Inversion With Adaptive Inversion Grid Refinement in Spherical Coordinates and Its Application to Mantle Structure Beneath Tibetan Plateau

Crustal density structure and flexure mechanism of the Tarim Basin, China, constrained by latest in situ gravity observations

Gravity Anomalies and Lithospheric Flexure in Western Yunnan, China, Deduced From a New Dense Gravimetry

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