出版社：Instituto Oceanográfico da Universidade de São Paulo
摘要：Br (0.04 %) in the samples.There was no correlation between CaCO3 and chemical contents and grain size with depth and bio-components.With the exception of Sr of marine origin, all other elements (P, S, Br, Cl, Fe) are of continental origin.The lithothamnium of some offshore samples shows higher CaCO3 content, while Mg and Na are present only in halimedas.Bioclastic sands contain no Br, and silt and clay fractions are rare and characterize samples closer to the coast.These marine bioclastic granulates are of very pure biogenic calcium carbonates and are thus highly to be recommended for economic purposes.
关键词：carbonato de cálcio marinho;geoquímica;plataforma continental;Brasil
