Lithospheric electrical structure across the Eastern Segment of the Altyn Tagh Fault on the Northern Margin of the Tibetan Plateau
Zhang, L., G. Ye, S. Jin, W. Wei, M. Unsworth, A.G. Jones, J Jing, H. Dong, C. Xie, F. Le Pape and J. Vozar
Project INDEPTH (InterNational DEep Profiling of Tibet and the Himalaya) is an
interdisciplinary program designed to develop a better understanding of deep structures and mechanics of
the Tibetan Plateau.
As a component of magnetotelluric (MT) works in the 4th phase of the project, MT data
were collected along a profile that crosses the eastern segment of the Altyn Tagh fault on the northern
margin of the plateau.
Time series data processing used robust algorithms to give high quality responses.
Dimensionality analysis showed 2D approach is only valid for the northern section of the profile.
Consequently, 2D inversions were only conducted for the northern section, and 3D inversions were
conducted on MT data from the whole profile.
From 2D inversion model, the eastern segment of the Altyn
Tagh fault only appears as a crustal structure, which suggests accommodation of strike slip motion along the
Altyn Tagh fault by thrustings within the Qilian Block.
A large scale off-profile conductor within the
mid-lower crust of the Qilian block was revealed from 3D inversion model, which is probably correlated with
the north Qaidam thrust belt.
Furthermore, the unconnected conductors from 3D inversion model indicate
deformations in the study area are generally localized.
Acta Geologica Sinica - English Edition, 89, 90-104, doi:10.1111/1755-6724.12397.
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Alan G Jones / 03 March 2015 /