Geochemistry of marine sediments of the Brazilian Northeastern continental shelf
作者： Fernanda Souza do Nascimento , George Satander Sá Freire , Brígida Miola
DOI: 10.1590/S1679-87592010000600002
关键词: Sediment 、 Silt 、 Halimeda 、 Carbonate 、 Grain size 、 Continental shelf 、 Geochemistry 、 Geology
摘要: The marine sediment samples collected from the northeastern Brazilian continental shelf, at water depths between 20 and 80 m, consisted mainly of sands with an almost total absence gravel granules. Medium, coarse very sand grains are mostly composed halimeda, lithothamnium, rodoliths bioclastic a carbonate content varying 77 96 %. chemistry in general shows decreasing Ca (86.1 %) >Si (6 > Cl (3.6 Sr (0.8 K (0.66 S (0.62 Al (0.6 Na (0.55%) Mg (0.43 Fe (0.4 P (0.2 Br (0.04 samples. There was no correlation CaCO3 chemical contents grain size depth bio-components. With exception origin, all other elements (P, S, Br, Cl, Fe) origin. lithothamnium some offshore higher content, while present only halimedas. Bioclastic contain silt clay fractions rare characterize closer to coast. These granulates pure biogenic calcium carbonates thus highly be recommended for economic purposes.
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