First geomorphological and sedimentological evidence for the combined tectonic and climate control on Quaternary Yarlung river diversion in the eastern Himalaya

摘要: This study investigates the combined effects of Quaternary climate change and tectonically induced topography on Yarlung River drainage-system evolution in eastern Himalaya. Our work integrates field mapping, geomorphological analysis, stratigraphy, sedimentology, optically stimulated luminescence dating, radiocarbon detrital-zircon dating a Holocene valley-fill sequence tributary. holistic approach reveals an aggradational event, which started at or soon after 24–20 k.y. B.P. continued to 9.2–8.0 across Himalayan drainage divide between east-flowing north south-flowing Subansiri south. The event was associated with major phase glacier advance during period warm wet conditions Himalaya; it expressed by deposition modern Yarlung-Subansiri divide. South-flowing fluvial sediments elevation distribution terraces require existence dam that either blocked tributary main trunk River. Although we are unable differentiate two competing scenarios, our have played role controlling rapid shifts geometry time scale <10