title: Geochronology and heavy metal flux to Guanabara Bay, Rio de Janeiro state: a preliminary study.
abstract: Guanabara Bay, located in Rio de Janeiro state. It is surrounded by the second most important metropolitan area of the country. Over recent decades, land disturbance and urbanization in the surrounding area has significantly increased sediment input to the bay and had a negative effect on its overall environmental. This is especially related to high volumes of untreated sewage and industrial effluents. This study evaluates the history of this human impact through detailed examination of a sediment core taken from the northern portion of Guanabara Bay. A geochronology is established using ²¹⁰Pb dating and related to organic carbon and heavy metal fluxes to the sediments. This gave a calculated net average sedimentation rate for the core of 0.67 cm.year⁻¹. The organic carbon and heavy metals flux started to increase at the beginning of the last century and the highest values was observed in the top of the cores.
authors.affiliation: Departamento de Geologia, Universidade Federal Fluminense, 24210-346NiteróiRJ, Brasil.
authors.forename: José A
authors.initials: JA
authors.lastname: Baptista Neto
authors.affiliation: Departamento de Geologia, Universidade Federal Fluminense, 24210-346NiteróiRJ, Brasil.
authors.forename: Tomás C S
authors.initials: TC
authors.lastname: Peixoto
authors.affiliation: School of Geography, Queen's University, Belfast, UK.
authors.forename: Bernard J
authors.initials: BJ
authors.lastname: Smith
authors.affiliation: School of Geography, Queen's University, Belfast, UK.
authors.forename: John J
authors.initials: JJ
authors.lastname: McAlister
authors.affiliation: Departamento de Geologia, Universidade Federal Fluminense, 24210-346NiteróiRJ, Brasil.
authors.forename: Soraya M
authors.initials: SM
authors.lastname: Patchineelam
authors.affiliation: Departamento de Geoquímica, Universidade Federal Fluminense, 24210-346NiteróiRJ, Brasil.
authors.forename: Sambasiva R
authors.initials: SR
authors.lastname: Patchineelam
authors.affiliation: Departamento de Geologia, Universidade Federal Fluminense, 24210-346NiteróiRJ, Brasil.
authors.forename: Estefan M
authors.initials: EM
authors.lastname: Fonseca
mesh_terms: D061006:Bays / Q000032:analysis / Q000737:chemistry*; D001938:Brazil; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D006801:Humans; D019216:Metals, Heavy / Q000032:analysis*; D012722:Sewage; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D019216:Metals, Heavy; D012722:Sewage; D014874:Water Pollutants, Chemical