Mineral weathering in acid saprolites from subtropical, southern Brazil

Detalhes bibliográficos
Autor(a) principal: Clemente,Celso Augusto
Data de Publicação: 2007
Outros Autores: Azevedo,Antonio Carlos de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Scientia Agrícola (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600007
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.
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spelling Mineral weathering in acid saprolites from subtropical, southern BrazilParaná BasinriodacitesplagioclasespyroxenesmagnetitesBecause 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.Escola Superior de Agricultura "Luiz de Queiroz"2007-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600007Scientia Agricola v.64 n.6 2007reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0103-90162007000600007info:eu-repo/semantics/openAccessClemente,Celso AugustoAzevedo,Antonio Carlos deeng2007-11-29T00:00:00Zoai:scielo:S0103-90162007000600007Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2007-11-29T00:00Scientia Agrícola (Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Mineral weathering in acid saprolites from subtropical, southern Brazil
title Mineral weathering in acid saprolites from subtropical, southern Brazil
spellingShingle Mineral weathering in acid saprolites from subtropical, southern Brazil
Clemente,Celso Augusto
Paraná Basin
riodacites
plagioclases
pyroxenes
magnetites
title_short Mineral weathering in acid saprolites from subtropical, southern Brazil
title_full Mineral weathering in acid saprolites from subtropical, southern Brazil
title_fullStr Mineral weathering in acid saprolites from subtropical, southern Brazil
title_full_unstemmed Mineral weathering in acid saprolites from subtropical, southern Brazil
title_sort Mineral weathering in acid saprolites from subtropical, southern Brazil
author Clemente,Celso Augusto
author_facet Clemente,Celso Augusto
Azevedo,Antonio Carlos de
author_role author
author2 Azevedo,Antonio Carlos de
author2_role author
dc.contributor.author.fl_str_mv Clemente,Celso Augusto
Azevedo,Antonio Carlos de
dc.subject.por.fl_str_mv Paraná Basin
riodacites
plagioclases
pyroxenes
magnetites
topic Paraná Basin
riodacites
plagioclases
pyroxenes
magnetites
description 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.
publishDate 2007
dc.date.none.fl_str_mv 2007-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600007
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600007
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-90162007000600007
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Escola Superior de Agricultura "Luiz de Queiroz"
publisher.none.fl_str_mv Escola Superior de Agricultura "Luiz de Queiroz"
dc.source.none.fl_str_mv Scientia Agricola v.64 n.6 2007
reponame:Scientia Agrícola (Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Scientia Agrícola (Online)
collection Scientia Agrícola (Online)
repository.name.fl_str_mv Scientia Agrícola (Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv scientia@usp.br||alleoni@usp.br
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