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(Article of periodic en Anglais - 2014)

Document title

Denudation and retreat of the Serra do Mar escarpment in southern Brazil derived from in situ-produced 10 Be concentration in river sediment

Authors(s) and Affiliation(s)

SALGADO A.A.R. (1 2) ; MARENT B.R. (1) ; CHEREM L.F.S. (3) ; BOURLÈS D. (2) ; SANTOS L.J.C. (4) ; BRAUCHER R. (2) ; BARRETO H.N. (5) ;
(1) Geography Dept. of Minais Gerais Federal Univ., Belo Horizonte, BRESIL
(2) CEREGE - UMR 6635 CNRS / Univ. Aix-Marseille, Aix-en-Provence, FRANCE
(3) Inst. of Socio-environmental Studies of Goiás Federal Univ., Goiânia, BRESIL
(4) Geography Dept. of Paraná Federal Univ. - Centro Politécnico/Setor Ciências da Terra/Dept de Geografia, Curitiba, BRESIL
(5) Geography Dept. of Maranhão Federal Univ., São Luís, BRESIL

Abstract

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

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2014, vol. 39, no3 [pp. 311-319]

Bibliographic references : 1 p.

Collation : 6 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3448

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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