The fluoride in the groundwater of Guarani Aquifer System: the origin associated with black shales of Paraná Basin |
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| Authors: | M L Kern A P Vieiro G Machado |
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| Institution: | 1.Laboratório de Análises de Carv?o e Rochas Geradoras de Petróleo,IG-UFRGS,Porto Alegre,Brazil;2.Laboratório de Fluorescência de Raios-X,IG-UFRGS,Porto Alegre,Brazil;3.Laboratório de Difratometria de Raios-X,IG-UFRGS,Porto Alegre,Brazil |
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| Abstract: | This work presents petrological and geochemical results of the black shales interval from Permian and Devonian strata of the
Paraná Basin, Brazil and its relationships with fluoride of groundwater from Guarani Aquifer System. The Guarani Aquifer,
located in South Brazil, Uruguay, Paraguay and Argentine, presents contents of fluoride higher than the Brazilian accepted
potability limits. Several hypotheses have been presented for the origin of the fluoride in the groundwater of the Guarani
Aquifer. Microcrystalline fluorite was registered in black shales of Ponta Grossa and Irati formations from Paraná Basin.
The results shown in this work suggest that fluoride present in groundwater of Guarani Aquifer can be originated in deeper
groundwater that circulates in Ponta Grossa and Irati formations. The interaction of the groundwater coming from deeper black
shales with the groundwater-bearing Aquifer Guarani System occurs through regional fragile structures (faults and fractures)
that constitute excellent hydraulic connectors between the two sedimentary packages. The microcrystalline fluorite registered
in Ponta Grossa and Irati Formations can be dissolved promoting fluoride enrichment in groundwater of these black shales and
Guarani Aquifer System. |
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| Keywords: | Guarani Aquifer Fluoride in groundwater Hydrogeology |
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