Late quaternary fluvial incision and aggradation in the Lesser Himalaya, India

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dc.contributor.authorDosseto, Aen_AU
dc.contributor.authorMay, JHen_AU
dc.contributor.authorChoi, JHen_AU
dc.contributor.authorSwander, ZJen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorKorup, Oen_AU
dc.contributor.authorHesse, PPen_AU
dc.contributor.authorSingh, Ten_AU
dc.contributor.authorMifsud, Cen_AU
dc.contributor.authorSrivastava, Pen_AU
dc.date.accessioned2021-12-16T21:16:58Zen_AU
dc.date.available2021-12-16T21:16:58Zen_AU
dc.date.issued2018-10-01en_AU
dc.date.statistics2021-11-16en_AU
dc.description.abstractReconstructing 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.en_AU
dc.identifier.citationDosseto, A., May, J.-H., Choi, J.-H., Swander, Z. J., Fink, D., Korup, O., Hesse, P., Singh, T., Mifsud, C., & Srivastava, P. (2018). Late quaternary fluvial incision and aggradation in the Lesser Himalaya, India. Quaternary Science Reviews, 197, 112-128, doi:10.1016/j.quascirev.2018.07.035en_AU
dc.identifier.issn0277-3791en_AU
dc.identifier.journaltitleQuaternary Science Reviewsen_AU
dc.identifier.pagination112-128en_AU
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2018.07.035en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12505en_AU
dc.identifier.volume197en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectAlluvial depositsen_AU
dc.subjectHimalayasen_AU
dc.subjectBeryllium 10en_AU
dc.subjectIsotope datingen_AU
dc.subjectGeomorphologyen_AU
dc.subjectMonsoonsen_AU
dc.titleLate quaternary fluvial incision and aggradation in the Lesser Himalaya, Indiaen_AU
dc.typeJournal Articleen_AU
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