Crustal Structure of Yunnan Province of China from Teleseismic Receiver Functions: Implications for Regional Crust Evolution

Fang Wang; Shuangxi Zhang; Mengkui Li

doi:10.1007/s12583-017-0822-9

Volume 29 Issue 6

Nov 2018

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Journal of Earth Science > 2018 > 29(6): 1419-1430.

Fang Wang, Shuangxi Zhang, Mengkui Li. Crustal Structure of Yunnan Province of China from Teleseismic Receiver Functions: Implications for Regional Crust Evolution. Journal of Earth Science, 2018, 29(6): 1419-1430. doi: 10.1007/s12583-017-0822-9

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Fang Wang, Shuangxi Zhang, Mengkui Li. Crustal Structure of Yunnan Province of China from Teleseismic Receiver Functions: Implications for Regional Crust Evolution. Journal of Earth Science, 2018, 29(6): 1419-1430. doi: 10.1007/s12583-017-0822-9

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Crustal Structure of Yunnan Province of China from Teleseismic Receiver Functions: Implications for Regional Crust Evolution

doi: 10.1007/s12583-017-0822-9

Fang Wang¹,
Shuangxi Zhang^{1,2,3
,
,},
Mengkui Li¹

1.
Department of Geophysics, School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2.
Key Laboratory of Geospace Environment and Geodesy of the Ministry of Education, Wuhan University, Wuhan 430079, China
3.
Collaborative Innovation Center of Geospace Information Science, Wuhan University, Wuhan 430079, China

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Corresponding author: Shuangxi Zhang
Received Date: 29 Sep 2016
Accepted Date: 20 Apr 2017
Publish Date: 01 Dec 2018

Abstract

Abstract

Yunnan Province is located on the southeastern margin of Tibet and represents an important marker in understanding the tectonic evolution of Tibetan Plateau. In this study, we calculated teleseismic P-wave receiver functions at 49 permanent broadband seismic stations in Yunnan Province and estimated crustal thickness and the bulk crust ratios of P-wave to S-wave velocities using the H-κ method together with more detailed crustal structural profiles from the common conversion point stacking method. There is a significant transition of Moho interface and lower crustal composition along latitude 26°N in northwestern Yunnan. Decrease of crustal thickness with a concomitant increase of Poisson's ratio occurs at station CUX. An interesting phenomenon is that a step-like Moho fashion is observed at several stations, which might correspond to local thermal activities, such as partial melt/lower crust delamination. Our results show changes in crustal properties appear to be associated with varieties in upper mantle structure and compositions. We propose the controlling factor of the dynamic processes below 26°N is the result of eastern forward subduction of the Indian Plate; the northern part is controlled by the redirected material flow from the SE Tibet.
- crustal structure,
- receiver function,
- Poisson's ratio,
- tectonic evolution

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References(61)

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Crustal Structure of Yunnan Province of China from Teleseismic Receiver Functions: Implications for Regional Crust Evolution

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