Determinação do carbonato biodetritico nos sedimentos do fundo do estuário Bons Sinais-Quelimane

Abstract

Estuaries are coastal sedimental environment were its evolution depends on the interaction between hydraulic parameters, sediments and morphologic aspects. The biodetric carbonate present in the sendiments characterize the quality of the sendiments. Its is in this context that research of determining the biodetric carbonate in the sediments the deep ends of bons sinais estuary in Quelimane, has a main objective of proriding materials about the environmental sedimentary of the estuary and its relevant function in geology, ecology and other through the concepts of concentraction levels of biodetric carbonate. Bons Sinais estuary is located in the Zambézia province, in the distric of Quelimane were its coordinate are found at 17°57’00.55’’ S and 36°54’ 36.83’’E covering a total area estimated in 60 km2. The are has length of 30 km and a width off 2 km. the canals deep ends is mainly composed of clay with 12 m in length. Fif leen samples of sediments were collected in October 2017. The methodology used included the determination of de biodetric carbonate content (%CaCO3) and the organic material, according to Gross (1971). The result indicated that biodetric carbonate content varied from: 2.696 to 15.1% with an average of 7.828% and it standard deviation of 3.0388. the organic material content varied from 0.279 to 7.278% with average of 3.2724% and standard deviation of 1.9263%. In general, the biodetric carbonate, had a greater concentraction in relaction to the organic material and its distribuition was nor uniform in are the samples. The geater concentraction of parametres were found near the margin of the estuary for both parametres. The correlation between the biodetric carbonate with the deep and organic material was direct with exceptions of some few point along every station. In relation to the sediments, they are classificated has litoclastic in accordance with carbonato teor.