TY  - JOUR
A1  - Govin, Gwladys
A1  - van der Beek, Pieter A.
A1  - Najman, Yani
A1  - Millar, Ian
A1  - Gemignani, Lorenzo
A1  - Huyghe, Pascale
A1  - Dupont-Nivet, Guillaume
A1  - Bernet, Matthias
A1  - Mark, Chris
A1  - Wijbrans, Jan
T1  - Early onset and late acceleration of rapid exhumation in the Namche Barwa syntaxis, eastern Himalaya
T2  - Geology
N2  - The Himalayan syntaxes, characterized by extreme rates of rock exhumation co-located with major trans-orogenic rivers, figure prominently in the debate on tectonic versus erosional forcing of exhumation. Both the mechanism and timing of rapid exhumation of the Namche Barwa massif in the eastern syntaxis remain controversial. It has been argued that coupling between crustal rock advection and surface erosion initiated in the late Miocene (8-10 Ma). Recent studies, in contrast, suggest a Quaternary onset of rapid exhumation linked to a purely tectonic mechanism. We report new multisystem detrital thermochronology data from the most proximal Neogene clastic sediments downstream of Namche Barwa and use a thermo-kinematic model constrained by new and published data to explore its exhumation history. Modeling results show that exhumation accelerated to similar to 4 km/m.y. at ca. 8 Ma and to similar to 9 km/m.y. after ca. 2 Ma. This three-stage history reconciles apparently contradictory evidence for early and late onset of rapid exhumation and suggests efficient coupling between tectonics and erosion since the late Miocene. Quaternary acceleration of exhumation is consistent with river-profile evolution and may be linked to a Quaternary river-capture event.
Y1  - 2020
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/56757
SN  - 0091-7613
SN  - 1943-2682
VL  - 48
IS  - 12
SP  - 1139
EP  - 1143
PB  - American Institute of Physics
CY  - Boulder
ER  -