Title
Relationship between the migration of crustal material, normal faulting, and gneiss domes in the vicinity of the Dinggye region, central part of the Tethys–Himalaya terrane: Insights from the 3-D electrical structure
Author
Sheng, Yue (China University of Geosciences)
Jin, Sheng (China University of Geosciences)
Comeau, M.J. (TU Delft Applied Geophysics and Petrophysics) 
Hou, Zengqian (Chinese Academy of Geological Sciences)
Zhang, Letian (China University of Geosciences)
Wei, Wenbo (China University of Geosciences)
Ye, Gaofeng (China University of Geosciences)
Date
2023
Abstract
The Dinggye region, in the central part of the Himalayan orogenic belt, includes the southern part of the Xainza-Dinggye rift and the Mabja Gneiss Dome with leucogranite cores. Previous studies of gneiss domes in this region report the existence of channel flow processes or tectonic exhumation, in addition to partial melting of orogenic mid-crust. However, the relationship between the crustal migration of materials and the north-south-trending normal rifts remains largely unexplored. In this work, we generate a new 3-D electrical resistivity model from an array of magnetotelluric data in the Dinggye region and examine it in addition to other electrical resistivity models to the north and east from previous works. By comparing the geophysical models with available geological and geochemical evidence, we find a clear relationship between the electrical resistivity structure, the presence of gneiss domes, north-south-trending normal rifting, and deep plunging subduction which is related to the source of Helium isotopes (crustal or mantle origin). Overall, the results suggest that the southern migration of lithospheric materials likely contributed to the evolution of the rifts in the Tethys-Himalaya terrane, which also may have been influenced by uplifting and cooling of gneiss domes. The models are consistent with tearing of the Indian lithosphere beneath the Xainza-Dinggye rift and other adjacent rifts. Additionally, the difference in the electrical structure related to the Indian crust along the east-west direction likely results from the exhumation of the continental slab, metamorphism in the Tethys-Himalaya terrane, and southern extrusion of materials in the Lhasa terrane.
Subject
Tibetan Plateau
Gneiss dome
Electrical structure
Rift
Crustal viscous flow
Subduction
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http://resolver.tudelft.nl/uuid:0fd2c29b-f179-4fbc-b520-2308ea6c98f5
DOI
https://doi.org/10.1016/j.tecto.2023.230100
Embargo date
2024-05-16
ISSN
0040-1951
Source
Tectonophysics, 869
Bibliographical note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2023 Yue Sheng, Sheng Jin, M.J. Comeau, Zengqian Hou, Letian Zhang, Wenbo Wei, Gaofeng Ye