Recycling of Pleistocene valley fills dominates 125 ka of sediment flux, upper Indus River

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dc.contributor.authorMunack, Hen_AU
dc.contributor.authorBlöthe, JHen_AU
dc.contributor.authorFülöp, RHen_AU
dc.contributor.authorCodilean, ATen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorKorup, Oen_AU
dc.date.accessioned2016-06-08T00:04:23Zen_AU
dc.date.available2016-06-08T00:04:23Zen_AU
dc.date.issued2016-01-01en_AU
dc.date.statistics2016-06-08en_AU
dc.description.abstractRivers draining the semiarid Transhimalayan Ranges along the western Tibetan Plateau margin underwent alternating phases of massive valley infill and incision in Pleistocene times. The imprints of these cut-and-fill cycles on long-term sediment fluxes have remained largely elusive. We investigate the timing and geomorphic consequences of headward incision of the Zanskar River, which taps the vast More Plains valley fill that currently impedes drainage of the endorheic high-altitude basins of Tso Kar and Tso Moriri. In situ 10Be exposure dating and topographic analyses indicate that a phase of valley infill gave way to net dissection of the >250-m thick sedimentary stacks ∼125 ka ago, i.e. during the last interglacial (MIS 5e). Rivers eroded >14.7 km3 of sediment from the Zanskar headwaters since then, fashioning specific sediment yields that surpass 10Be-derived denudation rates from neighbouring catchments by factors of two to ten. We conclude that recycling of Pleistocene valley fills has provided Transhimalayan headwater rivers with more sediment than bedrock denudation, at least since the beginning of the last glacial cycle. This protracted liberation of sediment stored in thick valley fills could bias rate estimates of current sediment loads and long-term bedrock denudation. © Author(s)en_AU
dc.identifier.citationMunack, H., Blöthe, J. H., Fülöp, R-H., Codilean, A. T., Fink, D., & Korup, O. (2016). Recycling of Pleistocene valley fills dominates 125 ka of sediment flux, upper Indus River. European Geosciences Union General Assembly 2016, 17-22 April 2016, Vienna, Austria.en_AU
dc.identifier.conferenceenddate22 April 2016en_AU
dc.identifier.conferencenameEuropean Geosciences Union General Assembly 2016en_AU
dc.identifier.conferenceplaceVienna, Australiaen_AU
dc.identifier.conferencestartdate17 April 2016en_AU
dc.identifier.govdoc6654en_AU
dc.identifier.otherEGU2016-13792, 2016en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2016/EGU2016-13792.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6938en_AU
dc.language.isoenen_AU
dc.publisherEuropean Geophysical Unionen_AU
dc.subjectRecyclingen_AU
dc.subjectPleistocene epochen_AU
dc.subjectValleysen_AU
dc.subjectIndus-1en_AU
dc.subjectRiversen_AU
dc.subjectGlaciersen_AU
dc.titleRecycling of Pleistocene valley fills dominates 125 ka of sediment flux, upper Indus Riveren_AU
dc.typeConference Abstracten_AU
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