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      Crustal-scale duplexing beneath the Yarlung Zangbo suture in the western Himalaya

      , , , , , ,
      Nature Geoscience
      Springer Nature

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          Himalayan tectonics explained by extrusion of a low-viscosity crustal channel coupled to focused surface denudation.

          Recent interpretations of Himalayan-Tibetan tectonics have proposed that channel flow in the middle to lower crust can explain outward growth of the Tibetan plateau, and that ductile extrusion of high-grade metamorphic rocks between coeval normal- and thrust-sense shear zones can explain exhumation of the Greater Himalayan sequence. Here we use coupled thermal-mechanical numerical models to show that these two processes-channel flow and ductile extrusion-may be dynamically linked through the effects of surface denudation focused at the edge of a plateau that is underlain by low-viscosity material. Our models provide an internally self-consistent explanation for many observed features of the Himalayan-Tibetan system.
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            Partially Molten Middle Crust Beneath Southern Tibet: Synthesis of Project INDEPTH Results

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              Seismic images of crust and upper mantle beneath Tibet: evidence for Eurasian plate subduction.

              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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                Author and article information

                Journal
                Nature Geoscience
                Nature Geosci
                Springer Nature
                1752-0894
                1752-0908
                June 6 2016
                June 6 2016
                : 9
                : 7
                : 555-560
                Article
                10.1038/ngeo2730
                c52d34ee-9354-40c9-a2b2-6c341acc8931
                © 2016
                History

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