nerc.ac.uk

Large rivers and orogens: the evolution of the Yarlung Tsangpo–Irrawaddy system and the eastern Himalayan syntaxis

Robinson, Ruth A.J.; Brezina, Cynthia A.; Parrish, Randall R.; Horstwood, Matt S.A.; Win Oo, Nay; Bird, Michael I.; Thein, Myint ; Walters, Abigail S.; Oliver, Grahame J.H.; Zaw, Khin. 2014 Large rivers and orogens: the evolution of the Yarlung Tsangpo–Irrawaddy system and the eastern Himalayan syntaxis. Gondwana Research, 26 (1). 112-121. 10.1016/j.gr.2013.07.002

Before downloading, please read NORA policies.
[img]
Preview
Text (Open Access Paper)
1-s2.0-S1342937X13002281-main.pdf - Published Version
Available under License Creative Commons Attribution.

Download (4MB) | Preview

Abstract/Summary

The eastern Himalayan syntaxis has experienced some of the highest rates of deformation and erosion in the orogen during the Late Cenozoic, and the Yarlung Tsangpo, Brahmaputra, Irrawaddy, Salween, and Mekong rivers are the key erosional systems in that region. The Yarlung Tsangpo drains southern Tibet and the deep Siang River gorge through the eastern Himalayan syntaxis before joining the Brahmaputra in northeastern India. It has been proposed that the Yarlung Tsangpo drained into other large rivers of southern Asia, such as the Irrawaddy, Salween and Red River. We have used uranium/lead dating and hafnium measurements of detrital zircons from Cenozoic sedimentary deposits in Central Myanmar to demonstrate that the Yarlung Tsangpo formerly drained into the Irrawaddy River in Myanmar through the eastern syntaxis, and that this ancient river system was established by (at least) the Middle–Late Eocene. The Yarlung Tsangpo–Irrawaddy river disconnected in the Early Miocene driven by increased deformation in the eastern syntaxis and headward erosion by tributaries of the Brahmaputra. Our results highlight the significance of the sedimentary record of large orogen-parallel rivers and provide key chronological constraints on landscape evolution during the Early Miocene phase of the Himalayan orogeny.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.gr.2013.07.002
ISSN: 1342937X
Date made live: 11 Sep 2015 11:00 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/511754

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...