Contribuição ao processo sedimentar atual no Canal do Ararapira, sistema estuarino-lagunar de Cananéia-Iguape (SP) / Contribution for the modern sedimentary process at cananéia-Iguape lagoonal estuarinbe system (SP)

AUTOR(ES)

Bibiana Kumpera Siqueira

DATA DE PUBLICAÇÃO

2007

RESUMO

The aim of this study is the analysis of modern sedimentary process taking place in the Ararapira Channel, at Cananéia-Iguape lagoonal estuarine system (SP). The employed parameters for this were the composition and grain size characteristics of the bottom sediments , the distribution of the carbonates , organic matter, and relates these parameters to the general configuration of the channel and to the oceanographic process that takes place over there. The grain size analysis, the carbonate content, and the sediment organic matter (C, N, S) were conducted over 60 sediment samples collected during an oceanographic cruise that took place in July 2004. Among the total of the 60 samples, 16 were selected for the coarse fraction analysis. The spatial analysis of the distribution of sediments and sedimentary organic matter showed that sandy sediments, with low organic content, are predominant practically all along the whole of the channel extension, except in points located in the central-northern portion of the channel, where there are thin sediment associated to shoals or small continental and insular river courses. The C, N, S and carbonates contents observed with the coarse fraction analysis, allow identifying the predominance of continental influence all along the channel, with lower carbonate concentrations. The sediment organic matter contents have, usually, behavior and distribution which are directly related to the type of sediment ,to the bottom topography, as well as to the circulation. It was possible to observe a direct relationship between the thin sediment and a larger content of the organic matter.

ASSUNTO(S)

sistema estuarino-lagunar coarse fraction analysys matéria orgânica processo sedimentar organic matter sedimentary process estuarine-lagoonal system análise da fração arenosa

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