Artículos de revistas
Sediment origin and budget in Sepetiba Bay (Brazil): an approach based on multielemental analysis
Fecha
1997Registro en:
BARCELLOS, C.; LARCERDA, L. D. de; CERADINI, S. Sediment origin and budget in Sepetiba Bay (Brazil): an approach based on multielemental analysis. Environmental Geology, v. 32, n. 3, p. 203-209, Oct. 1997.
1432-0495
Autor
Barcellos, Christovam de Castro
Lacerda, L. D.
Ceradini, S.
Institución
Resumen
Sediment origin and transport were determined in a shallow 447 km2 coastal lagoon in Brazil, using the distribution of major elements in bottom and suspended sediments. Applying multivariate analysis, the sum of normalized concentrations of Ti, Fe, and Al in sediments was selected to trace the terrigenous influence in bottom sediments, whereas Ca, Si, and K were used as indicators of marine influence. Sepetiba Bay bottom sediments are dominated by up to 80% terrigenous inputs. The open bay sediments are enriched in P, Mg, K, and Ca because of the intensive water column primary production. The inner bay forms an independent circulation cell with a predominance of terrigenous sediments. The results suggest a long residence time for particles in the bay, demonstrated by the magnitude of resuspension flux compared to the total sediment input to the bay.