globalchange  > 气候减缓与适应
DOI: 10.1016/j.quascirev.2018.07.035
Scopus ID: 2-s2.0-85051489786
Late quaternary fluvial incision and aggradation in the Lesser Himalaya, India
Author: Dosseto A.; May J.-H.; Choi J.-H.; Swander Z.J.; Fink D.; Korup O.; Hesse P.; Singh T.; Mifsud C.; Srivastava P.
Source Publication: Quaternary Science Reviews
ISSN: 2773791
Publishing Year: 2018
Volume: 197
pages begin: 112
pages end: 128
Language: 英语
Scopus Keyword: Catchments ; Feldspar ; Bedrock surfaces ; Chronological datum ; Fluvial dynamics ; Fluvial erosion ; Fluvial incision ; Indian summer monsoon ; Single aliquot regenerative dose ; Spatially homogeneous ; Atmospheric thermodynamics ; aggradation ; alluvial fan ; bedrock ; catchment ; dating method ; feldspar ; Holocene ; Quaternary ; runoff ; sediment transport ; Alaknanda River ; Benin [West Africa] ; Dehradun ; Donga Basin ; Himalayas ; India ; Uttarakhand
English Abstract: Reconstructing how rivers respond to changes in runoff or sediment supply by incising or aggrading has been pivotal in gauging the role of the Indian Summer Monsoon (ISM) as a geomorphic driver in the Himalayas. Here we present new chronological data for fluvial aggradation and incision from the Donga alluvial fan and the upper Alaknanda River, as well as a compilation of previous work. In addition to conventional OSL-SAR (Single-Aliquot Regenerative-Dose) dating method, we have tested and applied pulsed OSL (POSL) dating for quartz samples that include K-rich feldspar inclusions, which is expected to improve the applicability and validity of OSL ages in the Lesser Himalaya. For previously dated deposits, our OSL ages are shown to be systematically older than previously reported ages. These results suggest periods of aggradation in the Alaknanda and Dehradun Valleys mainly between ∼25 and 35 ka. This most likely reflects decreased stream power during periods of weakened monsoon. In addition, in-situ cosmogenic beryllium-10 was used to infer bedrock surface exposure ages, which are interpreted as episodes of active fluvial erosion. Resulting exposure ages span from 3 to 6 ka, suggesting that strath terraces were exposed relatively recently, and incision was dominant through most of the Holocene. In combination, our results support precipitation-driven fluvial dynamics, which regulates the balance between stream power and sediment supply. On a larger spatial scale, however, fluvial dynamics are probably not spatially homogeneous as aggradation could have been taking place in adjacent catchments while incision dominated in the study area. © 2018 Elsevier Ltd
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Document Type: 期刊论文
Appears in Collections:气候减缓与适应

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Affiliation: Wollongong Isotope Geochronology Laboratory, GeoQuEST Research Centre, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW, Australia; Department of Earth and Environmental Sciences, Korea Basic Science Institute, Ochang Centre, Chungbuk, 28119, South Korea; Australian Nuclear Science and Technology Organization, Lucas Heights, NSW, Australia; Institute of Earth and Environmental Sciences, University of Potsdam, Potsdam, Germany; Department of Geography, Macquarie University, North Ryde, NSW, Australia; CSIR Center for Mathematical Modelling and Computer Simulation, Bangalore, Karnataka, India; Wadia Institute of Himalayan Geology, Dehradun, Uttarakhand, India; School of Geography, University of Melbourne, Melbourne, VIC, Australia; CSIR-Central Scientific Instruments Organisation, Chandigarh, India

Recommended Citation:
Dosseto A.,May J.-H.,Choi J.-H.,et al. Late quaternary fluvial incision and aggradation in the Lesser Himalaya, India[J]. Quaternary Science Reviews,2018-01-01,197
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