Now showing items 1-6 of 6
U-Pb geochronology of the southern Brasília belt (SE-Brazil): Sedimentary provenance, Neoproterozoic orogeny and assembly of West Gondwana
(Precambrian Research, 2004-04-20) [Artigo]
The Brasília belt borders the western margin of the São Francisco Craton and records the history of ocean opening and closing related to the formation of West Gondwana. This study reports new U-Pb data from the southern ...
Tectonics and paleogeography along the Amazon river
(Journal of South American Earth Sciences, 2001-09-22) [Artigo]
The main structural and geomorphological features along the Amazon River are closely associated with Mesozoic and Cenozoic tectonic events. The Mesozoic tectonic setting is characterised by the Amazonas and Marajó Basins, ...
A comparative study of aquifer systems occurring at the Paraná sedimentary basin, Brazil: U-isotopes contribution
(Environmental Earth Sciences, 2013-01-01) [Artigo]
The radioactivity due to 238U and 234U in three aquifer systems occurring within the Paraná sedimentary basin, South America, has been investigated. Uranium is much less dissolved from fractured igneous rocks than from the ...
Sedimentation rates in the Corumbataí River basin, Brazil, derived from 210Pb measurements
(IAHS-AISH Publication, 2005-04-25) [Trabalho apresentado em evento]
Activity profiles of excess 210Pb measured in four sediment cores from the Corumbataí River basin, São Paulo State, Brazil, provided an opportunity to evaluate sedimentation rates that are helpful for defining appropriate ...
Some constraints on the modelling using the uranium isotopes 238U and 234U for dating groundwaters from Guarany aquifer, South America
(Management Information Systems, 2000-12-01) [Trabalho apresentado em evento]
Groundwaters from the Guarany aquifer located at the South American continent and sampled at four wells with described geological sections in São Paulo State, Brazil, were chemically and isotopically analysed with two aims: ...
Some reflections on the future of the water quality of the corumbataí River basin, São Paulo state, Brazil
(IAHS-AISH Publication, 2007-12-01) [Trabalho apresentado em evento]
The waters of Corumbataí River in the middle and eastern part of São Paulo State, Brazil, are extensively used for human consumption; their water quality has been modified mainly due to increasing pressure caused by ...