Dissertation > Excellent graduate degree dissertation topics show

The Characteristics and Tectonic Implications of Electrical Structure in the Crust and Mantle from the Northeastern Margin of the Tibetan Plateau (Dajing) to South China (Quanzhou)

Author: ZhangFan
Tutor: WeiWenBo
School: Chinese Geology University (Beijing)
Course: Geophysics
Keywords: Northeastern margin of the Tibetan Plateau Eastern margin of the TibetanPlateau South China Magnetotellurics Electrical structure
CLC: P631.4
Type: PhD thesis
Year: 2013
Downloads: 54
Quote: 0
Read: Download Dissertation


Under the auspices of the SinoProbe-02-04, a long magnetotelluric profile whichis longer than2000km was acquired from the town of Dajing in the northeasternmargin of the Tibetan Plateau to the city of Quanzhou in South China. Many methodshave been used during the magnetotelluric data processing such as the robustestimation, the remote reference method and the editing of the power spectrum in orderto acquire the high quality magnetotelluric data. The effects of the ocean coast onmagnetotelluric data have been studied by three-dimensional electromagnetic forwardmodeling. The qualitative analyses of the electrical structure along the profile havebeen done by analyzing many parameters such as Swift skewness, Bahr skewness,phase tensor, magnetic induction vector, and direction of strike. Dimensionalityanalysis has shown a good two-dimensional character along the profile. Subsurfaceelectrical structure has been obtained through nonlinear conjugate gradients algorithmfor two-dimensional magnetotelluric inversion.The electrical resistivity model along the profile indicates that the electricalstructure in eastern Tibetan Plateau is characterized by four distinct layers in verticaldirection and block division in horizontal direction. The electrical properties betweeneastern Tibetan Plateau and South China are quite different. The electrical resistivity ishigh in South China. The electrical structure in South China is characterized by blockdivision in horizontal direction and distinct layering partially in vertical direction.There are the high-conductivity layers in the middle and lower crust in easternTibetan Plateau. The distribution of the high-conductivity layers in different blocks isbased on different formation processes. The high-conductivity layers in the crust underQilian block are likely due to the existence of saline fluids. The high-conductivitylayers in the crust under West Qinling orogeny and Songpan-Ganzi block are likelydue to the existence of partial melts and saline fluids.The granitic rocks are the main components of the continental crust in Cathaysiablock. There might be tectono-magmatism in the crust in western Cathaysia block due to continental intraplate deformations. Both upsurge of heat mantle materials andcontinental rifting might result in partial melts in the crust in central Cathaysia block.Delivery of thermal energy and interaction between crust and mantle in easternCathaysia block might be induced in the stage that Pacific plate subducted to theEurasian continent.The Longmenshan fault in the electrical resistivity model along the profilepresents the overthrusting between the eastern margin of the Tibetan Plateau and theYangtze block. The conductive layer in the range of mid to upper crust marks thedetachment surface under the Longmenshan nappe structure. The boundary betweenthe conductive Tibetan Plateau and the resistive Yangtze block has been shown belowthe conductive layer. The relationship between eastern Tibetan Plateau and Yangtzeblock might reflects the uplift mechanism of eastern Tibet Plateau.

Related Dissertations

  1. Conflicts of interest on the South China Sea issue and China's strategic choice,D823
  2. The International-law Analysis on Island-Sovereignty Disputes between China and Neighboring Countries,D993.5
  3. Jurisprudential Analysis Advocated by Rights of States about the South China Sea Disputes and Countermeasures of China,D993.5
  4. Study on the Diapycnal and Isopycanl Mixing in the South Chian Sea and the Western North Pacific,P731.13
  5. The Study and Practice of Design Air Condition Setting in South China,TU831.4
  6. Interests in the South China Sea dispute on marine resources and Countermeasures,D993.5
  7. Characteristics of Turbulent Structure and Transfer over the South China Coastal Region,P732
  8. Preliminary Study on Living Coccolithophores and Its Associated Phytoplankton Community in the South China Sea in Summer and Winter,Q948.8
  9. The Study on Cultivation and Transformation of Artificial Ecological Forests of Pinus Massoniana,S791.248
  10. The Difference Analysis of gene Expression in Lonicera Confusa DC.under Calcium-rich Environment by GeneFishing,S567.79
  11. The South China Sea Dispute and Settlement on the Perspective of International Law,D993.5
  12. Growth Form of Devonian Stromatoporoid, Its Environmental Significance and Relationships between it and Bacteria & Algae in South China,P618.13
  13. Changes of the Paleoproductivity Across Permian-Triassic Boundary in the Deep-water Faices of South China,P618.13
  14. Research on Courtyard of Multi-story and High-rise Residential Buildings in South China,TU241
  15. International law in the South China Sea dispute,D993.5
  16. Legal Research on Oil and Gas Resources Development in the South Sea of China,D993.5
  17. Risky News,G212
  18. Features and Causes of Indosinian Structures in the Xuefengshan Tectonic System,P542.2
  19. Studies on the Distributions and Sea-to-air Fluxes of Volatile Halocarbons in the East China Sea, The Yellow Sea and the Northern South China Sea,P734.22
  20. Applicational Research of the SWAN Wave Model in Prediction of Wind Wave Field,P731.22
  21. Studies on the Definition of the South China Sea Summer Monsoon Onset and Its Influence on the Precipitation of China,P461.2

CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
© 2012 www.DissertationTopic.Net  Mobile