OCEANOGRAPHIC CHARACTERIZATION OF INNER CONTINENTAL SHELF NEAR CABO FRIO - RJ, IN THE WINTER OF 1995

L. SAAVEDRA, L.M.A. DORNELLES, S. B. SANTOS, R. ABSALÃO, S. M. C. ANJOS, G. V. MELO, N.S.G. STANTON, E. M. FONSECA, L. L. LIMA, E. T. KÜSEL, E. O. RIBEIRO, A. A. A. LAZILLOTA, F. A. ESTEVES

Abstract


The muddy sediments of the continental shelf near to Cabo Frio (RJ-Brazil) are principally being formed by sediments coming from Paraiba do Sul river and Guanabara bay. The purpose of this work was to determine the distribution of water masses, currents, suspended material and Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn, in the bottom sediments of the continental shelf near to Cabo Frio, in association with organic matter, calcium carbonate, fine particles and organisms. The water masses identified were Coastal and Tropical Water. The mineralogy of suspended material in the Coastal Water showed predominance of clay minerals followed by quartz, pyrite, k-feldspar and siderite. The bottom currents indicated predominantly sediment transport toward coast before passage of the cold front, and to offshore after this. Cr, Cu, Fe, Mn, Ni, Pb correlated positively with fine particles (< 0.062 mm), organic matter and cadmium. Nucula semiornatta, Adrana Patagonia - detritivorous - and Corbula patagonica - filter-feeding - (Bivalvia), are abundant on line 1 and could be used as biological monitors to the studied region.


Keywords


heavy metals, water masses, suspended material, continental shelf of Cabo Frio, molluses

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