Data/hora: 05/06/2024 18:01:15

Provedor de dados: | 63
País: | Brazil
Título: | Mineral weathering in acid saprolites from subtropical, southern Brazil
Autores: | Clemente,Celso Augusto; Azevedo,Antonio Carlos de.
Data: | 2007-12-01
Ano: | 2007
Palavras-chave: | Paraná Basin; Riodacites; Plagioclases; Pyroxenes; Magnetites.
Resumo: | Because weathering of minerals releases chemical elements into the biogeochemical cycle, characterization of their weathering products helps to better model groundwater quality, formation of secondary minerals and nutrient flux through the trophic chain. Based on microscopic and elemental analyses, weathering of riodacite from Serra Geral formation was characterized and weathering paths proposed. Three weathering paths of plagioclase phenocrystals were identified: plagioclase to gibbsite (Pg1); plagioclase to gels and gibbsite (Pg2); and plagioclase to gels, gibbsite and kaolinite (Pg3). Pyroxenes weathered to smectite and goethite (Py1), or to goethite and gibbsite (Py2), and magnetite weathered directly into iron oxides. Rock matrix comprises 90% of rock volume, and weathered to kaolinite and gibbsite, which explains why these minerals were the most abundant in the weathering products of these saprolites.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600007
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162007000600007
Formato: | text/html
Fonte: | Scientia Agricola  v.64 n.6 2007
Fonte: | info:eu-repo/semantics/openAccess