DOI: 10.1016/j.tecto.2020.228606
论文题名: Deep thermal state on the eastern margin of the Lhasa-Gangdese belt and its constraints on tectonic dynamics based on the 3-D electrical model
作者: Sheng Y. ; Jin S. ; Lei L. ; Dong H. ; Zhang L. ; Wei W. ; Ye G. ; Li B. ; Lu Z.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 793 语种: 英语
中文关键词: 3D electrical model
; Indian plate
; Lhasa-Gangdese block
; Material migration
; Thermal model
英文关键词: 3D modeling
; Geodynamics
; Hydraulic structures
; Structural geology
; Tectonics
; Arrhenius equation
; Derived materials
; Electrical modeling
; Electrical structures
; Lithospheric mantle
; Magnetotelluric data
; Terrestrial heat flow
; Thermal structure
; Plates (structural components)
; boundary condition
; electrical method
; Eurasian plate
; heat flow
; Indian plate
; lithospheric structure
; magmatism
; magnetotelluric method
; mountain region
; plate convergence
; tectonic setting
; thermal structure
; three-dimensional modeling
; uplift
; China
; Gangdise Mountains
; Lhasa Mountains
; Xizang
; Calluna vulgaris
英文摘要: Since the Mesozoic, the Lhasa-Gangdese block has undergone several stages of tectonism-magmatism caused by the closure of the New-Tethys Ocean and the collision between the Indian and Eurasian plates, which led to the lithospheric shortening and crustal uplift. Through the careful processing and analysis of the magnetotelluric data on the eastern margin of the Lhasa-Gangdese block near 92°E, a reliable 3D electrical model was obtained to examine the relationship between the lithospheric electrical structure and geodynamics. Some conductive and resistive layers were obtained, which may be formed in some tectonic processes. The thermal model of the lithospheric uppermost mantle (75–100 km) were calculated using the Arrhenius equation and the Hashin-Shtrikman (HS) boundary condition. Combined with the terrestrial heat flow point and curie isothermal in the study area, the temperature distribution at the 30–100 km depths was calculated. The melt fractions of the mid-lower crust calculated by the classical Archie's law, pressure calculated by density and temperature at different depths can be obtained in a meantime. The resistor beneath the Tethys-Himalaya terrane represented the subduction of the Indian plate with a deep angle. The subduction of the Indian crust may not exceed the Indus-Yarlung Zangbo suture, while the Indian lithospheric mantle may not reach the Luobadui-Milashan fault. Additionally, our electrical and thermal structure indicated that the Indian lithospheric mantle probably detached from the Indian crust. Our study further discussed the underplating of the mantle-derived materials and the southern extrusion along the Main Himalaya Trust, and offered a subsidiary evidence for the possible “south-eastward crustal flow” in a local area. Finally, the relationship between the electrical structure and the deep metallogenic mechanism was briefly established. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170710
Appears in Collections: 气候变化与战略
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作者单位: School of Geophysics and Information Technology, China University of Geosciences, Beijing, 100083, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, China; School of mining technology, Inner Mongolia University of Technology, Huhhot, Inner Mongolia, China; Institute of Geology, Chinese Academy of Geological Science, Key Laboratory of Earth Probe and Geodynamics, Ministry of Land and Resources of the People's Republic of China, Beijing, 100037, China
Recommended Citation:
Sheng Y.,Jin S.,Lei L.,et al. Deep thermal state on the eastern margin of the Lhasa-Gangdese belt and its constraints on tectonic dynamics based on the 3-D electrical model[J]. Tectonophysics,2020-01-01,793