Mots-clés
Accumulation fluviatile ; Analyse isotopique ; Bassin-versant ; Brésil ; Brésil du Sud ; Erosion différentielle ; Escarpement ; Exposition de versant ; Littoral ; Marge continentale ; Serra do Mar ; Vitesse d'érosionBrazil ; Coastal environment ; Continental margin ; Differential erosion ; Erosion rate ; Escarpment ; Fluvial deposit ; Isotope analysis ; Slope exposure ; Southern Brasil ; WatershedAcumulación fluviátil ; Análisis isotópico ; Brasil ; Cuenca hidrográfica ; Erosión diferencial ; Escarpadura ; Exposición de las vertientes ; Litoral ; Margen continental ; Velocidad de erosiónDenudation and retreat of the Serra do Mar escarpment in southern Brazil derived from in situ-produced 10 Be concentration in river sediment
Auteur(s) et Affiliation(s)
SALGADO, A.A.R.
Geography Dept. of Minais Gerais Federal Univ., Belo Horizonte, Bresil
CEREGE - UMR 6635 CNRS / Univ. Aix-Marseille, Aix-en-Provence, France
MARENT, B.R.
Geography Dept. of Minais Gerais Federal Univ., Belo Horizonte, Bresil
CHEREM, L.F.S.
Inst. of Socio-environmental Studies of Goiás Federal Univ., Goiânia, Bresil
BOURLÈS, D.
CEREGE - UMR 6635 CNRS / Univ. Aix-Marseille, Aix-en-Provence, France
SANTOS, L.J.C.
Geography Dept. of Paraná Federal Univ. - Centro Politécnico/Setor Ciências da Terra/Dept de Geografia, Curitiba, Bresil
BRAUCHER, R.
CEREGE - UMR 6635 CNRS / Univ. Aix-Marseille, Aix-en-Provence, France
BARRETO, H.N.
Geography Dept. of Maranhão Federal Univ., São Luís, Bresil
Description :
In this study, the AA. measured the in situ-produced 10 Be concentration in fluvial sediments to quantify the catchment-wide long-term denudation rates of the Serra do Mar escarpment. They sampled the fluvial sediments from 10 watersheds that drain both sides of the escarpment. The average long-term denudation rate of the oceanic side is higher than the rate of the continental side. The rates indicate that the coastal base level is controlling the escarpment retreat toward the continental high lands, which is consistent with observations made at other high-elevation passive margins around the globe. The results also demonstrate the differential erosion along the Serra do Mar escarpment in southern Brazil during the Quaternary, where drainages over granites had lower average denudation rates in comparison with those over migmatites and gneisses. The results also reveal that drainage over the granites decreases the average denudation rates of the ocean-facing catchments and the sugarloaf hills therefore are natural barriers that slowly retreat once they are exhumed.
Type de document :
Article de périodique
Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 3, p. 311-319, nombre de pages : 9, Références bibliographiques : 1 p.
Date :
2014
Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley
Langue :
Anglais
Anglais
Droits :
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Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)