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Tibetan plate overriding the Asian plate in central and northern Tibet

Authors
/persons/resource/kind

Kind,  Rainer
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Zhao,  W.
External Organizations;

Kumar,  P.
External Organizations;

/persons/resource/jimmy

Mechie,  James
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Karplus,  M.
External Organizations;

/persons/resource/tilmann

Tilmann,  Frederik
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Kind, R., Zhao, W., Kumar, P., Mechie, J., Karplus, M., Tilmann, F. (2011): Tibetan plate overriding the Asian plate in central and northern Tibet, AGU 2011 Fall Meeting (San Francisco 2011).


https://gfzpublic.gfz-potsdam.de/pubman/item/item_244621
Abstract
Seismological imaging has identified the Indian lithosphere penetrating underneath Tibet up to 500km to the north and to a depth of at least 200km along a front that is more than 1000km long. This is a classical case of continental subduction. In contrast, the collision of Tibet with the stable Tarim Basin in the north-west caused thickening of the Tibetan lithosphere to about 200km, whereas collision with the Sichuan Basin in the east caused thinning of the Tibetan lithosphere to about 70km. No sufficient seismic data on the mantle lithosphere have been available up to now at the boundary of Tibet to the Qaidam Basin, where subduction of the Asian lithosphere beneath Tibet was suggested. We report on results from a recent seismic passive source experiment in this region, which continued the series of INDEPTH experiments to the Qaidam Basin in the north-east. We used the S receiver function technique for data analysis, which is especially sensitive for observations of the lithosphere-asthenosphere boundary (LAB). As a surprising result, we found evidence that a newly identified relatively thin Tibetan lithosphere is overriding the flat subducting Asian lithosphere.