Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones

Autores
Campodonico, Verena Agustina; Pasquini, Andrea Inés; Lecomte, Karina Leticia; García, María Graciela; Depetris, Pedro José
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Subtropical laterites in Misiones province cover the Jurassic-Cretaceous Serra Geral basalts. Two hypotheses have been proposed to explain the origin of these laterites. The autochthonous theory states that these deposits result from chemical weathering of the underlying tholeiitic basalts. However, during the last decade, an allochthonous “tropical loess” model was proposed. A lateritic profile (~2 m thick, 26°9'58"S - 54°35'3"W) was analyzed in order to constrain the nature of weathering processes and the provenance of the lateritic layer. Different alteration indices showed the extreme leaching of the basaltic bedrock. The index of lateritization (IOL = 35-50) and the accompanying SAF ternary plot (SiO2-Al2O3-Fe2O3), indicate an increasing weathering trend towards the profiles' top, reflecting the modest loss of SiO2 (relative to Al2O3 and Fe2O3) during kaolinitization. The geochemical approach used in this work clearly relates the analyzed laterites to the underlying tholeiitic basalts, supporting the autochthonous origin theory.
Centro de Investigaciones Geológicas
Materia
Geología
tropical/subtropical weathering
weathering indices
Serra Geral Fm.
lateritic sources
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/77403
Acceder
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repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Análisis de la meteorización química y proveniencia en lateritas subtropicales de MisionesProbing into the nature of chemical weathering and provenance in Misiones subtropical lateritesCampodonico, Verena AgustinaPasquini, Andrea InésLecomte, Karina LeticiaGarcía, María GracielaDepetris, Pedro JoséGeologíatropical/subtropical weatheringweathering indicesSerra Geral Fm.lateritic sourcesSubtropical laterites in Misiones province cover the Jurassic-Cretaceous Serra Geral basalts. Two hypotheses have been proposed to explain the origin of these laterites. The autochthonous theory states that these deposits result from chemical weathering of the underlying tholeiitic basalts. However, during the last decade, an allochthonous “tropical loess” model was proposed. A lateritic profile (~2 m thick, 26°9'58"S - 54°35'3"W) was analyzed in order to constrain the nature of weathering processes and the provenance of the lateritic layer. Different alteration indices showed the extreme leaching of the basaltic bedrock. The index of lateritization (IOL = 35-50) and the accompanying SAF ternary plot (SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>-Fe<SUB>2</SUB>O<SUB>3</SUB>), indicate an increasing weathering trend towards the profiles' top, reflecting the modest loss of SiO<SUB>2</SUB> (relative to Al<SUB>2</SUB>O<SUB>3</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB>) during kaolinitization. The geochemical approach used in this work clearly relates the analyzed laterites to the underlying tholeiitic basalts, supporting the autochthonous origin theory.Centro de Investigaciones Geológicas2019-06info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionObjeto de conferenciahttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdf62-65http://sedici.unlp.edu.ar/handle/10915/77403enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-96296-7-3info:eu-repo/semantics/reference/hdl/10915/77067info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-03T10:45:51Zoai:sedici.unlp.edu.ar:10915/77403Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 10:45:51.373SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
Probing into the nature of chemical weathering and provenance in Misiones subtropical laterites
title Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
spellingShingle Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
Campodonico, Verena Agustina
Geología
tropical/subtropical weathering
weathering indices
Serra Geral Fm.
lateritic sources
title_short Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
title_full Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
title_fullStr Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
title_full_unstemmed Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
title_sort Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
dc.creator.none.fl_str_mv Campodonico, Verena Agustina
Pasquini, Andrea Inés
Lecomte, Karina Leticia
García, María Graciela
Depetris, Pedro José
author Campodonico, Verena Agustina
author_facet Campodonico, Verena Agustina
Pasquini, Andrea Inés
Lecomte, Karina Leticia
García, María Graciela
Depetris, Pedro José
author_role author
author2 Pasquini, Andrea Inés
Lecomte, Karina Leticia
García, María Graciela
Depetris, Pedro José
author2_role author
author
author
author
dc.subject.none.fl_str_mv Geología
tropical/subtropical weathering
weathering indices
Serra Geral Fm.
lateritic sources
topic Geología
tropical/subtropical weathering
weathering indices
Serra Geral Fm.
lateritic sources
dc.description.none.fl_txt_mv Subtropical laterites in Misiones province cover the Jurassic-Cretaceous Serra Geral basalts. Two hypotheses have been proposed to explain the origin of these laterites. The autochthonous theory states that these deposits result from chemical weathering of the underlying tholeiitic basalts. However, during the last decade, an allochthonous “tropical loess” model was proposed. A lateritic profile (~2 m thick, 26°9'58"S - 54°35'3"W) was analyzed in order to constrain the nature of weathering processes and the provenance of the lateritic layer. Different alteration indices showed the extreme leaching of the basaltic bedrock. The index of lateritization (IOL = 35-50) and the accompanying SAF ternary plot (SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>-Fe<SUB>2</SUB>O<SUB>3</SUB>), indicate an increasing weathering trend towards the profiles' top, reflecting the modest loss of SiO<SUB>2</SUB> (relative to Al<SUB>2</SUB>O<SUB>3</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB>) during kaolinitization. The geochemical approach used in this work clearly relates the analyzed laterites to the underlying tholeiitic basalts, supporting the autochthonous origin theory.
Centro de Investigaciones Geológicas
description Subtropical laterites in Misiones province cover the Jurassic-Cretaceous Serra Geral basalts. Two hypotheses have been proposed to explain the origin of these laterites. The autochthonous theory states that these deposits result from chemical weathering of the underlying tholeiitic basalts. However, during the last decade, an allochthonous “tropical loess” model was proposed. A lateritic profile (~2 m thick, 26°9'58"S - 54°35'3"W) was analyzed in order to constrain the nature of weathering processes and the provenance of the lateritic layer. Different alteration indices showed the extreme leaching of the basaltic bedrock. The index of lateritization (IOL = 35-50) and the accompanying SAF ternary plot (SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>-Fe<SUB>2</SUB>O<SUB>3</SUB>), indicate an increasing weathering trend towards the profiles' top, reflecting the modest loss of SiO<SUB>2</SUB> (relative to Al<SUB>2</SUB>O<SUB>3</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB>) during kaolinitization. The geochemical approach used in this work clearly relates the analyzed laterites to the underlying tholeiitic basalts, supporting the autochthonous origin theory.
publishDate 2019
dc.date.none.fl_str_mv 2019-06
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
Objeto de conferencia
http://purl.org/coar/resource_type/c_5794
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status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/77403
url http://sedici.unlp.edu.ar/handle/10915/77403
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/isbn/978-987-96296-7-3
info:eu-repo/semantics/reference/hdl/10915/77067
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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