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Preferential Riverine Export of Fine Volcanogenic Particles to the Southeast Australian Margin ArchiMer
Bayon, Germain; Douglas, Grant B.; Denton, Geoff J.; Monin, Laurence; De Deckker, Patrick.
We report on rare earth element and neodymium isotopic compositions in a series of grain-size fractions separated from river suspended matter in the Murray-Darling Basin (MDB) and a nearby marine sediment core (MD03-2607) offshore south-eastern Australia. This source-to-sink approach was used to further investigate the extent to which sediment sorting may control the geochemistry of suspended loads in rivers, and to provide constraints on the source of the detrital sediment material exported to the ocean. Our results provide further compelling evidence that significant size-dependent geochemical decoupling can occur in river systems, accounting here for Nd isotopic (εNd) differences of up to eight epsilon-units between silt (>25 μm) and colloidal...
Tipo: Text Palavras-chave: Rare earth elements; Neodymium isotopes; Suspended particulates; Colloids; Murray-Darling Basin; Australia.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00610/72210/71005.pdf
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