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The signature of river- and wind-borne materials exported from Patagonia to the southern latitudes: a view from REEs and implications for paleoclimatic interpretations

Gaiero, Diego M. and Depetris, Pedro J. and Probst, Jean-Luc and Bidart, Susana M. and Leleyter, Lydia The signature of river- and wind-borne materials exported from Patagonia to the southern latitudes: a view from REEs and implications for paleoclimatic interpretations. (2004) Earth and Planetary Science Letters, vol. 2 (n° 3-4). pp. 357-376.

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Official URL: http://dx.doi.org/10.1016/S0012-821X(03)00686-1

Abstract

Riverine and wind-borne materials transferred from Patagonia to the SW Atlantic exhibit a homogeneous rare earth element (REE) signature. They match well with the REE composition of Recent tephra from the Hudson volcano,and hence this implies a dominance of material supplied by this source and other similar Andean volcanoes. Due to the trapping effect of proglacial and reservoir lakes,the larger Patagonian rivers deliver to the ocean a suspended load with a slightly modified Andean signature,that shows a REE composition depleted in heavy REEs. In this paper we redefine Patagonia as a source of sediments,which is in contrast with other sources located in southern South America. Quaternary sediments deposited in the northern and,to a lesser extent, in the southern Scotia Sea, and most of the dust in ice cores of east Antarctica have REE compositions very similar to the loess from Buenos Aires Province and to Patagonian eolian dust. However,we rule out Buenos Aires province as a Holocene major source of sediments. Similarly to Buenos Aires loess (a proximal facies),it is likely that the REE compositions of most sediment cores of the Scotia Sea and Antarctica reflect a distal transport of dust with an admixed composition from two main sources: a major contribution from Patagonia,and a minor proportion from source areas containing sediments with a clear upper crustal signature (e.g.,western Argentina) or from Bolivia’s Altiplano. Evidence indicates that only during the Last Glacial Maximum,Patagonian materials were the predominant sediment source to the southern latitudes.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Earth and Planetary Science Letters website: http://www.elsevier.com/wps/find/journaldescription.cws_home/503328/description#description
Audience (journal):International peer-reviewed journal
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Institution:Other partners > Universidad Nacional de Cordoba - UNC (ARGENTINA)
French research institutions > Institut de Recherche pour le Développement - IRD
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université de Caen Basse-Normandie (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Universidad Nacional del Sur - UNS (ARGENTINA)
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Deposited By: Florence Amor
Deposited On:09 Apr 2010 13:27

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