Consulta: subjectFacets:"Glacial erosion"
Registros recuperados: 3
Data/hora: 15/06/2024 07:58:27

Glacial erosion dynamics in a small mountainous watershed (Southern French Alps): A source-to-sink approach
Provedor de dados: 5
Autores: Bonneau, Lucile; Toucanne, Samuel; Bayon, Germain; Jorry, Stephan; Emmanuel, Laurent; Silva Jacinto, Ricardo.
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...
Tipo: Text
Palavras-chave: Var; Routing system; Glacial erosion; Source-to-sink.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00358/46957/47130.pdf

The changing Patagonian landscape: Erosion and westward sediment transfer paths in northern Patagonia during the Middle and Late Pleistocene
Provedor de dados: 5
Autores: Villaseñor, Tania; Tentori, Daniel; Marsaglia, Kathleen M.; Pinto, Luisa.
Pleistocene glaciations have promoted important landscape transformations as a result of high rates of erosion and rapid sediment evacuation to adjacent marine basins. In the Patagonian Andes the role of the Patagonian Ice Sheet on landscape evolution, in particular the spatial patterns of glacial erosion and its influence on sediment fluxes, is poorly documented. Here, we investigate the Middle and Late Pleistocene sedimentary record of the continental slope from Ocean Drilling Program (ODP) Site 861, offshore Patagonia (46ºS), to evaluate the link between glaciations, mountain range erosion and continental margin strata formation. Petrographic analysis of the sand‐size fraction (0.063‐2 mm) and ƐNd and 87Sr/86Sr measurements in the silt‐size fraction...
Tipo: Text
Palavras-chave: Glacial erosion; Ocean Drilling Program; Patagonia; Patagonian Ice Sheet; Sediment provenance; Source to sink.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00565/67730/67219.pdf

Geomorfología de Punta Fort William, Isla Greenwich, Islas Shetland del sur, Antártida
Provedor de dados: 20
Autores: Cornejo, R.; Horn F., N.; Troian, F.L.
Correlacionando las condiciones topográficas, los procesos geodinámicos que han modelado y modelan el paisaje, y la litología en Punta Fort William, se han identificado siete unidades geomorfológicas. Los cuerpos de roca que afloran en forma aislada en el sector y que son remanentes de la erosión glaciar y marina, conforman la primera unidad geomorfológica denominada promontorios rocosos. La segunda unidad está conformada por los depósitos de playa actuales y por las paleoplayas que han sido alejadas de la línea de costa por el proceso de levantamiento que afecta a las Islas Shetland del sur. También se han identificado como unidades geomorfológicas los depósitos glaciolacustres, las zonas fluvioglaciares, las actuales zonas de abrasión marina, las zonas...
Tipo: Journal Contribution
Palavras-chave: Geomorphology; Lithology; Glacial erosion; Geomorphology; Lithology; Http://aims.fao.org/aos/agrovoc/c_3233; Http://aims.fao.org/aos/agrovoc/c_12203.
Ano: 1993
URL: http://hdl.handle.net/1834/3769