U-series disequilibria in suspended river sediments and implication for sediment transfer time in alluvial plains: The case of the Himalayan rivers

238U– 234U– 230Th radioactive disequilibria were analyzed in suspended sediments (collected at different depths) from the Ganges River and one of its main tributaries: the Narayani–Gandak River. Results associated with bedload sediment data suggest that uranium-series (U-series) disequilibria in riv...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 2010-05, Vol.74 (10), p.2851-2865
Main Authors: Granet, M., Chabaux, F., Stille, P., Dosseto, A., France-Lanord, C., Blaes, E.
Format: Article
Language:English
Subjects:
Catchments
Coarsening
Erosion rate
Position (location)
Rivers
Sampling
Sediments
Transits
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Summary:238U– 234U– 230Th radioactive disequilibria were analyzed in suspended sediments (collected at different depths) from the Ganges River and one of its main tributaries: the Narayani–Gandak River. Results associated with bedload sediment data suggest that uranium-series (U-series) disequilibria in river sediments of the Ganges basin vary with grain size and sampling location. The range of observed U-series disequilibria is explained by a mixing model between a coarse-grained sediment end-member, represented by bedload and bank sediments, and a fine-grained end-member that both originate from Himalaya but undergo different transfer histories within the plain. The coarse-grained sediment end-member transits slowly (i.e. >several 100’s ky) in the plain whereas the fine-grained sediment end-member is transferred much faster (
ISSN:0016-7037
1872-9533
0016-7037
DOI:10.1016/j.gca.2010.02.016