Crustal rheology of the Himalaya and Southern Tibet inferred from magnetotelluric data

  title={Crustal rheology of the Himalaya and Southern Tibet inferred from magnetotelluric data},
  author={Martyn Unsworth and A. G. Jones and W. Wei and G. L. Marquis and S. G. Gokarn and Jessica Spratt},
The Cenozoic collision between the Indian and Asian continents formed the Tibetan plateau, beginning about 70 million years ago. Since this time, at least 1,400 km of convergence has been accommodated by a combination of underthrusting of Indian and Asian lithosphere, crustal shortening, horizontal extrusion and lithospheric delamination. Rocks exposed in the Himalaya show evidence of crustal melting and are thought to have been exhumed by rapid erosion and climatically forced crustal flow… 
Crustal deformation of the eastern Tibetan plateau revealed by magnetotelluric imaging
The ongoing collision of the Indian and Asian continents has created the Himalaya and Tibetan plateau through a range of deformation processes. These include crustal thickening, detachment of the
Crustal flow in Tibet : geophysical evidence for the physical state of Tibetan lithosphere , and inferred patterns of active flow
Many seismic and magnetotelluric experiments within Tibet provide proxies for lithospheric temperature and lithology, and hence rheology. Most data have been collected between ~88°E and 95°E in a
Crustal flow in Tibet: geophysical evidence for the physical state of Tibetan lithosphere, and inferred patterns of active flow
  • S. Klemperer
  • Geology
    Geological Society, London, Special Publications
  • 2006
Abstract Many seismic and magnetotelluric experiments within Tibet provide proxies for lithospheric temperature and lithology, and hence rheology. Most data have been collected between c. 88°E and
Varying Indian crustal front in the southern Tibetan Plateau as revealed by magnetotelluric data
In the southern Tibetan plateau, which is considered to be the ongoing India–Eurasia continental collision zone, tracing of the Indian crustal front beneath Tibet is still controversial. We conducted
Evidence of crustal ‘channel flow’ in the eastern margin of Tibetan Plateau from MT measurements
Magnetotelluric (MT) survey has been carried out in the eastern margin of the Tibetan Plateau and its neighboring Shimian-Leshan area, Sichuan Province. Analysis of this MT data reveals that the
Contribution of crustal anatexis to the tectonic evolution of Indian crust beneath southern Tibet
This geochemical, geochronological and structural study of intrusive rocks in the Sakya Dome of southern Tibet has identified two distinct suites of anatectic granites that carry contrasting
The impact of a tear in the subducted Indian plate on the Miocene geology of the Himalayan-Tibetan orogen
The Yadong-Gulu Rift, cutting across the Gangdese belt and Himalayan terranes, is currently associated with a thermal anomaly in the mantle and crustal melting at 15−20 km depth. The rift follows the
Underplating in the Himalaya-Tibet Collision Zone Revealed by the Hi-CLIMB Experiment
Using an 800-kilometer-long, densely spaced seismic array, an image of the crust and upper mantle beneath the Himalayas and the southern Tibetan Plateau is constructed, revealing in a continuous fashion the Main Himalayan thrust fault as it extends from a shallow depth under Nepal to the mid-crust under southern Tibet.


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Convective removal of lower lithosphere beneath the Tibetan Plateau can account for a rapid increase in the mean elevation of the Tibetan Plateau of 1000 m or more in a few million years. Such uplift
Geologic Evolution of the Himalayan-Tibetan Orogen
A review of the geologic history of the Himalayan-Tibetan orogen suggests that at least 1400 km of north-south shortening has been absorbed by the orogen since the onset of the Indo-Asian collision
Tibetan, Variscan, and Precambrian Basement Reactivation: Products of Continental Collision
Extensive terranes of basement reactivation are interpreted as resulting from crustal thickening following continental collision. It is suggested that terranes, such as the Grenville Province and
Oblique Stepwise Rise and Growth of the Tibet Plateau
Two end member models of how the high elevations in Tibet formed are (i) continuous thickening and widespread viscous flow of the crust and mantle of the entire plateau and (ii) time-dependent,
Detection of Widespread Fluids in the Tibetan Crust by Magnetotelluric Studies
Magnetotelluric exploration has shown that the middle and lower crust is anomalously conductive across most of the north-to-south width of the Tibetan plateau, suggesting that partial melt and/or aqueous fluids are widespread within the Tibetan crust.
Partial melt or aqueous fluid in the mid-crust of Southern Tibet? Constraints from INDEPTH magnetotelluric data
SUMMARY The INDEPTH project has applied modern geophysical techniques to the study of the crustal structure and tectonic evolution of the Tibetan Plateau. In the Lhasa Block, seismic reflection
Electrical structure across the Indus Tsangpo suture and Shyok suture zones in NW Himalaya using magnetotelluric studies
Magnetotelluric studies in the NW Himalayan region have shown anomalously high conductance of about 20,000 siemens in the crust beneath the Indus Tsangpo suture (ITS) and the adjoining Tso‐Morari
Evidence for present-day leucogranite pluton growth in Tibet.
Several geophysical surveys carried out in southern Tibet have revealed the occurrences of bright spots of high electrical conductivity at 15–20 km depth, corresponding to zones of seismic