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Cosmogenic Nuclide Determination of the Source of Sediment to the Brahmaputra River

AB: The Ganges-Brahmaputra river system ranks first among the world's rivers in total sediment flux. One of the two principal tributaries to this system, the Yarlung Tsangpo/Brahmaputra River (YTBR) is the main source of sediment and water to the northeastern Himalayan foreland. Upstream, where the river traverses the eastern Himalayan syntaxis, it slices a 5 km-deep gorge through rapidly cooled crystalline rocks, some exhumed over 20 km since the end Pliocene. The spatial coincidence of the Tsangpo gorge with the highly deformed and rapidly exhumed rocks of the Namche Barwa-Gyala Peri massif has motivated the hypothesis that vigorous erosion by the YTBR helps localize crustal uplift and deformation in this region of the Himalaya. To better understand the geomorphic and geodynamic evolution of this spectacular region, we measured in-situ, cosmic-ray produced Be-10 in quartz sand from rivers entering and exiting the eastern syntaxis. From where the YTBR plunges