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

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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, combined with other previous studies. 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.

Key Words

crustal structure receiver function Poisson’s ratio tectonic evolution 

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Acknowledgments

We thank Hok Sum Fok and James Hammond for their serious reading of the original work and providing many suggestive advices. We thank two anonymous reviewers and editors for their detailed reviews that improve this manuscript. We also thank Robert B. Herrmann and Zhu Lupei for their CPS (Computer Programs in Seismology) package and H-κ code separately. Waveform data for this study were provided by Data Management Center of Yunnan Seismic Network. This study was supported by the 973 Project of China (No. 2013CB733303) and the National Natural Science Foundation of China (No. 41474093). The final publication is available at Springer via https://doi.org/10.1007/s12583-017-0822-9.

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Copyright information

© China University of Geosciences and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Geophysics, School of Geodesy and GeomaticsWuhan UniversityWuhanChina
  2. 2.Key Laboratory of Geospace Environment and Geodesy of the Ministry of EducationWuhan UniversityWuhanChina
  3. 3.Collaborative Innovation Center of Geospatial TechnologyWuhanChina

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