Evaluation of the environmental quality in Caravelas estuary, northeastern Brazil: sedimentological, geochemical and microfaunal evidences - Sousa, S; Amaral, P; Martins, V; Siegle, Eduardo; Figueira, Rubens César Lopes; Shinagawa, E; Mahiques, Michel Michaelovitch de (International Coastal Symposium, 2013)