Complex Structure beneath the Southeastern Tibetan Plateau from Teleseismic P-Wave Tomography

Yang, Ting; Wu, Jianping; Fang, Lihua; Wang, Weilai

doi:10.1785/0120130029

Cited by 28 publications

(27 citation statements)

References 84 publications

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“…8). They are consistent with previous teleseismic P-wave tomographic studies (Yang et al, 2014;Huang et al, 2015;Li et al, 2006). A large-scale high-velocity perturbation (Hv2) appears in the 300 and 400 km depth sections in the central part (Fig.…”

Section: Resultssupporting

confidence: 92%

“…8). Huang et al (2015) and Yang et al (2014) also defined a lowvelocity perturbation at 100-200 km depth. In the 300, 400, and 500 km depth sections, there is a low-velocity perturbation (Lv2) in the central part of the Emeishan LIP (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…9d, a large-scale low-velocity perturbation (Lv1) appears in the upper mantle (along the 24 • N). Yang et al (2014) and Huang et al (2015) also defined a low-velocity perturbation along 25 • N. In the 28 and 30 • profiles, the Lv2 and Lv3 can be seen in the upper mantle and mantle transition zone, respectively. In the northsouth profile, the results also show Lv1 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Yang et al, 2014;Zhao et al, 1992). The location of the seismic ray crossing through the boundary of the study region was determined by a 1-D (or 1-D IASP91) velocity model, and theoretical travel time and seismic ray paths are obtained by the fast ray tracing technique (or pseudo-bending technique) (Zhao et al, 1992).…”

Section: Methodsmentioning

confidence: 99%

“…In the past 2 decades, several seismic tomographic studies have been carried out on the Emeishan LIP and surrounding regions, including 2.5-D tomography of the uppermost mantle (Lü et al, 2014), ambient noise Love and Rayleigh wave tomography (Li et al, 2010(Li et al, , 2009, teleseismic P-wave tomography (Bai et al, 2011;Yang et al, 2014;Huang et al, 2015), local earthquake tomography Xu et al, 2012), interstation Pg and Sg differential travel-time tomography , and Pn anisotropic tomography (Lei et al, 2014). These works have revealed the velocity structure of the crust and upper mantle beneath this region, although they did not directly address the mechanism of the Emeishan LIP formation.…”

Section: Introductionmentioning

confidence: 99%

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Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography

Santosh

2017

Solid Earth

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Abstract. The voluminous magmatism associated with large igneous provinces (LIPs) is commonly correlated to upwelling plumes from the core-mantle boundary (CMB). Here we analyse seismic tomographic data from the Emeishan LIP in southwestern China. Our results reveal vestiges of delaminated crustal and/or lithospheric mantle, with an upwelling in the upper mantle beneath the Emeishan LIP rather than a plume rooted in the CMB. We suggest that the magmatism and the Emeishan LIP formation might be connected with the melting of delaminated lower crustal and/or lithospheric components which resulted in plume-like upwelling from the upper mantle or from the mantle transition zone.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography

Santosh

2017

Solid Earth

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Upper mantle discontinuity structure beneath eastern and southeastern Tibet: New constraints on the Tengchong intraplate volcano and signatures of detached lithosphere under the western Yangtze Craton

Zhang

Gao

et al. 2017

JGR Solid Earth

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We present new constraints on the upper mantle transition zone structure beneath eastern and southeastern Tibet based on P wave receiver functions for a large broadband data set from two very dense seismic arrays. A clear depression of both the 410 km and 660 km discontinuities is detected west of the Red River fault relative to the east. The correlated topographic variations across the Red River fault are indicative of temperature changes in the upper mantle above the transition zone, which suggests that the fault is a deep‐rooted structure that penetrates into the upper mantle and separates Indochina from South China. West of the Red River fault, the transition zone thickness under the Tengchong volcano is found to be normal compared to the global average. This strongly suggests that the intraplate volcano may originate from slab tearing of the eastward subducting Indian plate at shallow depths in the upper mantle rather than from dehydration of a flattened plate within the transition zone. Our results further show that the 660 km discontinuity is significantly depressed under the western Yangtze Craton and that the transition zone therefore thickens by up to 20 km. This thickening is suggestive of lowered temperatures associated with a remnant of detached lithosphere in response to overlying asthenospheric escape flow in and around the western Yangtze Craton. In addition, we find that the transition zone thickness beneath much of the Sichuan Basin is similar to the global average.

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Crustal thickness and Poisson's ratio in southwest China based on data from dense seismic arrays

Wang

Fang

et al. 2017

JGR Solid Earth

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Crustal thickness and Poisson's ratio are important parameters to characterize regional isostasy state and material composition or state. Using the teleseismic waveform data from 141 permanent stations and 785 temporary stations in southwest China, we obtain the crustal thickness and average Poisson's ratio by the H‐κ stacking of receiver functions. In the west (the SE Tibetan Plateau and the Yunnan‐Burma‐Thailand block) and southeast (the Cathaysian block and southern Yangtze craton) of the study region, there are high correlation coefficients for the crustal thicknesses between what we obtain from the receiver functions and what we calculate from the Airy isostasy model, indicating that a state of isostasy can be achieved at the crust‐mantle boundary beneath these two regions. In the northeast (northern Yangtze craton), the correlation coefficient is lower, indicating that the effect of the lithosphere needs to be considered for a regional isostasy. Intermediate Poisson's ratios (0.26 ≤ σ ≤ 0.28) are found beneath the northern Panzhihua‐Emeishan region. Combing the high‐velocity features from previous study, we speculate that it may be related to the Emeishan large igneous province. High Poisson's ratios (σ > 0.28) are found beneath the SE Tibetan Plateau and the nearby strike‐slip faults, such as the Anninghe‐Zemuhe fault and the northern Xiaojiang fault. Combing the low‐velocity zones from previous study, we speculate that there may be partially melted and lower crustal flow.

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Complex Structure beneath the Southeastern Tibetan Plateau from Teleseismic P-Wave Tomography

Cited by 28 publications

References 84 publications

Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography

Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography

Upper mantle discontinuity structure beneath eastern and southeastern Tibet: New constraints on the Tengchong intraplate volcano and signatures of detached lithosphere under the western Yangtze Craton

Crustal thickness and Poisson's ratio in southwest China based on data from dense seismic arrays

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