210Pb-derived chronology in sediment cores evidencing the anthropogenic occupation history at Corumbataí River basin, Brazil |
| |
| Authors: | D M Bonotto J L N de Lima |
| |
| Institution: | (1) Instituto de Geociências e Ciências Exatas (IGCE), Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Avenida 24-A No. 1515, P.O. Box 178, 13506-900 Rio Claro, São Paulo, Brazil;(2) Departamento de Ciências Exatas, Campus de Ji-Paraná, Fundação Universidade Federal de Rondônia-UNIR, Estrada Itapirema, 78961-170 Ji-Paraná, Rondônia, Brazil |
| |
| Abstract: | Activity profiles of excess 210Pb combined with chemical data determined in two sediment cores from Corumbataí River basin, São Paulo State, Brazil, provided new insights into the reconstruction of historical inputs of anthropogenic constituents, contributing to improving management strategies of the hydrological resources in the basin since most of the municipalities extensively utilize the waters of Corumbataí River and tributaries for drinking purposes, among other uses. Excellent significant relationships between loss on ignition (LOI) and organic matter were found for sediments of both analyzed profiles. Silica was found to be inversely related to organic matter at both analyzed profiles: its decrease accompanied an increase in the specific surface of the sediments. This relationship was confirmed by a great number of inverse significant correlations among silica and oxides Na2O, K2O, CaO, MgO, Al2O3, P2O5, Fe2O3, MnO, and TiO2. It was possible to identify the role of organic matter on adsorption of several oxides/elements in the core sediments profiles. Apparent sediment mass accumulation rates corresponding to 224 and 802 mg cm−2 year−1 were obtained, and are compatible with field evidence, indicating a higher value associated with sand mining activities interfering with the natural/normal sedimentation process, due to modifications of the channel drainage. |
| |
| Keywords: | Lead-210 Sediment cores Chemical elements Corumbataí River basin Brazil |
| 本文献已被 SpringerLink 等数据库收录！ |
|
