Data/hora: 07/06/2024 05:58:51

Provedor de dados: | 5
País: | France
Título: | Glacial erosion dynamics in a small mountainous watershed (Southern French Alps): A source-to-sink approach
Autores: | Bonneau, Lucile; Toucanne, Samuel; Bayon, Germain; Jorry, Stephan; Emmanuel, Laurent; Silva Jacinto, Ricardo.
Data: | 2017-01
Ano: | 2017
Palavras-chave: | Var; Routing system; Glacial erosion; Source-to-sink.
Resumo: | In this study we used major element composition, neodymium isotopes ratios (εNdεNd) and concentration of REE to track and quantify the sediment routing in the Var sedimentary system from source (Southern French Alps) to sink (Ligurian Sea) over the last 50 ka. Our data reveal that changes in sediment sources over that period, associated with concomitant changes in the hyperpycnal (i.e. flood-generated turbidity currents) activity in the Var submarine canyon, were mainly driven by paleoenvironmental conditions in the upper basin and in particular by the presence of glaciers during the last glacial period. Based on this evidence, we determined when and how glacier-derived sediments were produced, then excavated and transferred to the ocean, allowing us to ultimately tune offshore sedimentary records to onshore denudation rates. In contrast to large glaciated systems, we found that sediment export from the Var River to the Mediterranean Sea directly responded to climate-induced perturbations within the basin. Finally, we estimated that sediment fluxes in the Var routing system were 2.5 times higher during the Last Glacial Maximum than today, thus confirming that glacier denudation rates exceed fluvial rates and that such a pattern also governs the interglacial–glacial sediment flux cycle in other small mountainous basins
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00358/46957/47130.pdf

DOI:10.1016/j.epsl.2016.11.004

http://archimer.ifremer.fr/doc/00358/46957/

Editor: | Elsevier Science Bv
Formato: | application/pdf
Fonte: | Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2017-01 , Vol. 458 , P. 366-379

Fonte:

2016 Elsevier B.V. All rights reserved.

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