Abstract
Abstract The Shillong Plateau (northeastern India) constitutes the only significant topography in the Himalayan foreland. Knowledge of its surface uplift history is key to understanding topographic development and unraveling tectonic–climate–topographic coupling in the eastern Himalaya. We use the sedimentary record of the Himalayan foreland basin north of the Shillong Plateau to show that the paleo-Brahmaputra river was redirected north and west by the rising plateau at 5.2–4.9 Ma. We suggest that onset of plateau uplift is a result of increased fault-slip rates in response to stresses caused by the Indian lithosphere bending beneath the Himalaya.
Highlights
Unraveling the topographic evolution of mountain ranges remains a challenge. We address this question in the Shillong Plateau (SP), a 1600-m-high fault-bounded basement uplift in the Himalayan foreland, the uplift history of which is linked to both orographic rainfall patterns and strain partitioning in the eastern Himalaya (Clark and Bilham, 2008; Coutand et al, 2014; Grujic et al, 2006)
Rutile U-Pb dating of sample SJ8 returned 25 out of 92 ages unique to the syntaxis (U-Pb ages
We date the initiation of topographic growth of the Shillong Plateau to between 4.9 and 5.2 Ma
Summary
Unraveling the topographic evolution of mountain ranges remains a challenge. We address this question in the Shillong Plateau (SP), a 1600-m-high fault-bounded basement uplift in the Himalayan foreland (northeastern India; Fig. 1), the uplift history of which is linked to both orographic rainfall patterns and strain partitioning in the eastern Himalaya (Clark and Bilham, 2008; Coutand et al, 2014; Grujic et al, 2006).Low-temperature thermochronology data indicate that exhumation of the SP initiated between ca. 9 and 15 Ma Unraveling the topographic evolution of mountain ranges remains a challenge. We address this question in the Shillong Plateau (SP), a 1600-m-high fault-bounded basement uplift in the Himalayan foreland (northeastern India; Fig. 1), the uplift history of which is linked to both orographic rainfall patterns and strain partitioning in the eastern Himalaya (Clark and Bilham, 2008; Coutand et al, 2014; Grujic et al, 2006). Low-temperature thermochronology data indicate that exhumation of the SP initiated between ca. InRdao-nBguersman ES LHASA TERRANE IYSZ Yarlung Tsangpo INDIAN P LATE.
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