Análise dos Bioclastos Marinhos da Região Sul da Plataforma Continental de Pernambuco, Brasil

Abstract

Ocean sediments can be classified according to their origin into three broad categories: terrigenous sediments, biogenic sediments or bioclasts and authigenic sediments. This paper aims to identify and describe the groups of organisms that are the bioclasts found in sedimentary samples on the platform of the southern region of Pernambuco state. The samples were collected by the Geological Survey of Brazil - CPRM through Granmar Project (Marine Granules from Shallow Continental Shelf of Brazil) on the continental southern shelf of Pernambuco in the city of Sirinhaém, which were assigned to this study, where samples were collected ranging 13 to 32m. Eighteen samples were analyzed (AM 01 to AM 18). From each sample was collected 10 g of sediment for analysis of the material. In the results it was possible to observe a large amount of terrigenous sediment compared to biogenic sediments, with a predominance of quartz, feldspar and mica. In biogenic sediments stand out calcareous algae with 40%, foraminifera showing 39% and molluscs 14%, followed by 3% bryozoans, echinoderms 2%, 1% arthropods and 1% porifera. The preservation of sediments was in whole and fragmented parts. The fauna of organisms that make up the bioclasts of the Pernambuco south platform are typical faunas of shallow marine environments, with tropical waters and area of moderate to high hydrodynamic energy, represented by relict specimens.