U–U–Th disequilibria and timescale of sedimentary transfers in rivers: Clues from the Gangetic plain rivers |
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Authors: | Fran ois Chabaux, Mathieu Granet, Eric Pelt, Christian France-Lanord,Valier Galy |
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Affiliation: | aLaboratoire de Géochimie isotopique et de Chimie de l'environnement, CGS-EOST, 1 rue Blessig, F-67084 Strasbourg Cedex, France;bCentre de Recherches Pétrographiques et Géochimiques (CRPG-CNRS), 15 rue Notre Dame-des-Pauvres, F-54501 Vandoeuvre-lès-Nancy, France |
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Abstract: | This study uses 238U–234U–230Th disequilibria in river sediments in order to constrain the transfer times of sediments in alluvial plains of rivers from Himalaya and the Gangetic plain. From the observed distributions we infer sediment transfer times of about 100 ka in the Gangetic plain for rivers taking their source in the Himalayan chain, and longer transfer of about 160–250 ka for foothill-fed rivers. This difference is probably related to the difference in the sediment transport dynamics of these two types of rivers. |
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Keywords: | U-disequilibria Sediment transfer-time Himalaya chain Gangetic plain |
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