Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Determination of controls on Holocene barrier progradation through application of OSL dating: The Ilha Comprida Barrier example, Southeastern Brazil

Full text
Author(s):
Guedes, C. C. F. [1] ; Giannini, P. C. F. [1] ; Sawakuchi, A. O. [1] ; DeWitt, R. [2] ; Nascimento, Jr., D. R. [1] ; Aguiar, V. A. P. [1] ; Rossi, M. G. [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Dept Geol Sedimentar & Ambiental, Inst Geociencias, BR-05508080 Sao Paulo - Brazil
[2] Oklahoma State Univ, Radiat Dosimetry Lab, Dept Phys, Stillwater, OK 74074 - USA
Total Affiliations: 2
Document type: Journal article
Source: MARINE GEOLOGY; v. 285, n. 1-4, p. 1-16, JUL 1 2011.
Web of Science Citations: 26
Abstract

Barrier development during the Holocene is studied using the example of the Ilha Comprida, Southeastern Brazil. Aerial photos, facies analysis, and optically stimulated luminescence dating are used to define the barrier emergence and evolution. Optically stimulated luminescence ages and facies successions indicate that the Ilha Comprida probably began as a Holocene transgressive barrier island 6000 years ago, just before the last relative sea-level maximum. Since then the barrier has progradated through the addition of curved beach ridges. Based on beach ridge alignments, six units of growth are identified with two growth directions, transverse and longitudinal. Rates of progradation with transverse growth vary from 0.13 to 4.6 m/year. Rates of longitudinal growth to NE range from 5.2 to 30 m/year. Variation in coastal progradation rates and sediment retention during the last 6000 years is compared with climate, physiography and relative sea-level changes. The physiography, represented by pre-Cenozoic hills, is the major control on sediment retention and alternation between longitudinal and transverse growth. Climate variations, such as the Little Ice Age event, apparently control the formation of ridges types: beach ridges, foredunes, and blowouts. These results allow the use of the Ilha Comprida Barrier as an example to analyze the major controls on barriers progradation. (C) 2011 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 07/51511-4 - Quaternary sedimentary evolution of Ilha Comprida, São Paulo state
Grantee:Carlos Conforti Ferreira Guedes
Support type: Scholarships in Brazil - Master