Doctoral Dissertations
Keywords and Phrases
Crustal flow; Crustal thickness; Crustal Vp/Vs; East Tibet; Sichuan Basin
Abstract
"To provide constraints on the mechanisms responsible for the uplift and crustal thickening of the eastern Tibetan Plateau, the thickness and Vp/Vs values of the Moho beneath 153 seismic stations are obtained by stacking P-to-S converted phases from the Moho and gravity modeling. The resulting crustal thickness generally decreases from the northwest to the south-east, from about 60 km in the Bayan Har Block to 30 km in the Sichuan Basin. The crustal Vp/Vs measurements in the Qinling Orogenic Belt, Bayan Har Block, Chuxiong Basin, and Yangtze Platform indicate an overall intermediate to felsic crustal composition. With a relatively thick crust, the inferred crustal Vp/Vs beneath the Bayan Har Block indicates that crustal shortening is accomplished by brittle crustal thickening between rigid crustal blocks, a conclusion that is in line with the observed density structure derived from Bouguer gravity data. High crustal Vp/Vs values up to 1.96 are observed along the Xianshuihe and southern Longmenshan faults. The observed spatial distribution of crustal properties is in agreement with the hypothesis that strain partitioning across deep-rooted faults and the presence of a localized crustal channel flow system both play a vital role in the lateral expansion of the eastern Tibetan Plateau"--Abstract, page iii.
Advisor(s)
Liu, Kelly H.
Gao, Stephen S.
Committee Member(s)
Rogers, J. David
Wei, Mingzhen
Yu, Youqiang
Department(s)
Geosciences and Geological and Petroleum Engineering
Degree Name
Ph. D. in Geology and Geophysics
Sponsor(s)
National Key Research and Development Program of China
National Science Foundation (U.S.)
Publisher
Missouri University of Science and Technology
Publication Date
Summer 2018
Pagination
ix, 51 pages
Note about bibliography
Includes bibliographic references (pages 43-50).
Geographic Coverage
Plateau of Tibet
Rights
© 2018 Yunxin Peng, All rights reserved.
Document Type
Dissertation - Open Access
File Type
text
Language
English
Thesis Number
T 11720
Electronic OCLC #
1164805496
Recommended Citation
Peng, Yunxin, "Crustal structure beneath the eastern margin of the Tibetan Plateau and adjacent areas from receiver function stacking and gravity modeling" (2018). Doctoral Dissertations. 2894.
https://scholarsmine.mst.edu/doctoral_dissertations/2894
Comments
This research is partially funded by the National Key Research and Development Program of China (No. 2016YFC0601005), and by the United States National Science Foundation under grant 0911346.