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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Controls of heavy minerals and grain size in a holocene regressive barrier (Ilha Comprida, southeastern Brazil)

Texto completo
Autor(es):
Guedes, C. C. F. [1] ; Giannini, P. C. F. [1] ; Nascimento, Jr., D. R. [1] ; Sawakuchi, A. O. [1] ; Tanaka, A. P. B. [1] ; Rossi, M. G. [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Geociencias, Dept Geol Sedimentar & Ambiental, BR-05508080 Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Journal of South American Earth Sciences; v. 31, n. 1, p. 110-123, FEB 2011.
Citações Web of Science: 15
Resumo

Ilha Comprida is a regressive barrier island located in southeastern Brazil that was formed essentially by Quaternary sandy sediments. Ilha Comprida sediments were analyzed to assess heavy mineral indices and grain size variables. The spatial variation of heavy minerals and grain size was interpreted in terms of the present barrier dynamics and the barrier's evolution since the Middle Holocene. These analyses allowed for the identification of the main factors and processes that control the variation of heavy minerals and grain size on the barrier. Rutile and zircon (RZi) and tourmaline and hornblende (THi) are significantly sensitive to provenance and exhibit the contributions of the Ribeira de Iguape River sediments, which reach the coast next to the northeastern end of Ilha Comprida. In addition to the influence of provenance, TZi responds mainly to hydraulic sorting processes. This agrees with a sediment transport pattern characterized by a divergence of two resultant net alongshore drifts southwest of the barrier. The sediments from the Ribeira de Iguape River reach the barrier directly through the river mouth and indirectly after temporary storage in the inner shelf. The combination of grain size and heavy mineral analyses is a reliable method for determining sediment transport patterns and provenance. (C) 2010 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 07/51511-4 - Evolução sedimentar quaternária da Ilha Comprida, Estado de São Paulo
Beneficiário:Carlos Conforti Ferreira Guedes
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 01/01732-8 - Dinâmica de sistemas deposicionais eólicos: um estudo comparativo entre o recente e o antigo
Beneficiário:Paulo César Fonseca Giannini
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 02/01016-3 - Os cordões litorâneos e as dunas eólicas da Ilha Comprida, estado de São Paulo
Beneficiário:Carlos Conforti Ferreira Guedes
Linha de fomento: Bolsas no Brasil - Iniciação Científica