Seismic images of crust and upper mantle beneath Tibet: evidence for Eurasian plate subduction |
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Authors: | Kind R Yuan X Saul J Nelson D Sobolev S V Mechie J Zhao W Kosarev G Ni J Achauer U Jiang M |
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Affiliation: | GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany. kind@gfz-potsdam.de |
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Abstract: | Seismic data from central Tibet have been combined to image the subsurface structure and understand the evolution of the collision of India and Eurasia. The 410- and 660-kilometer mantle discontinuities are sharply defined, implying a lack of a subducting slab beneath the plateau. The discontinuities appear slightly deeper beneath northern Tibet, implying that the average temperature of the mantle above the transition zone is about 300 degrees C hotter in the north than in the south. There is a prominent south-dipping converter in the uppermost mantle beneath northern Tibet that might represent the top of the Eurasian mantle lithosphere underthrusting the northern margin of the plateau. |
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