Abstract
Atolls are reefs that are both generate from as accumulate of carbonate sediments. The bioclastic carbonates of Rocas Atoll, Northeast of Brazil, were analyzed from surface samples of various environmental compartments. The results show the dominance of calcareous algae bioclasts, foraminiferans and molluscs in sediments of reef bioconstruction and the sediment dynamics of the area. Evidence of allochtonous and autochtonous contributions in the sedimentological composition of atoll and variations in the composition along the windward-leeward gradient are discussed. Unlike other atolls of the planet, the Rocas Atoll present the lagoonal facies with low proportion of total carbonate facies associated with the reef and low frequency of coral bioclasts.
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