Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province

Autores
Walther, A.M.; Orgeira, M.J.; Lippai, H.F.
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A geological and geophysical study in fluvial post-pampean sediments cropping out on the right bank of the Rio Areco was carried out. The sequence studied comprises the Guerrero and Río Salado members of the Luján Formation, in which three palaeosols are developed. The geophysical studies suggest an impoverishment of the detrital ferrimagnetic minerals (magnetite and titanomagnetite) in the parent material, due to the action of pedogenic processes, accompanied by the generation of two neominerales, one antiferromagnetic and the other ferrimagnetic. The ferrimagnetic mineral consists of particles of ultrafine magnetite (state of superparamagnetic domain, grain size approaching 0.01 μm) formed during periods of excess water. The antiferromagnetic minerals (hematite and/or goethite) were generated in periods of major water deficiency. The presence of these minerals would be indicating a warm and humid climate with a marked dryperiod. The oldest paleosol was developed on the Guerrero Member which correlates with the Puesto Callejón Viejo palaeosol that has an age between 10,000 and 8,000 years AP, in this profile. The Rio Salado Member and the two paleosols developed on it would have developed during the warm period known as, Megathermal, between 9,000 and 7,000 years BP. © 2004 Asociación Geológica Argentina.
Fil:Walther, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Orgeira, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Lippai, H.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fuente
Rev. Asoc. Geol. Argent. 2004;59(3):433-442
Materia
Environmental magnetism
Paleoclimate
Quaternary
Stratigraphy
detrital deposit
magnetite
paleoclimate
paleosol
proxy climate record
Quaternary
titanomagnetite
Argentina
Buenos Aires [Argentina]
South America
Western Hemisphere
World
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/2.5/ar
Repositorio
Biblioteca Digital (UBA-FCEN)
Institución
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
OAI Identificador
paperaa:paper_00044822_v59_n3_p433_Walther
Acceder
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oai_identifier_str paperaa:paper_00044822_v59_n3_p433_Walther
network_acronym_str BDUBAFCEN
repository_id_str 1896
network_name_str Biblioteca Digital (UBA-FCEN)
spelling Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province Walther, A.M.Orgeira, M.J.Lippai, H.F.Environmental magnetismPaleoclimateQuaternaryStratigraphydetrital depositmagnetitepaleoclimatepaleosolproxy climate recordQuaternarytitanomagnetiteArgentinaBuenos Aires [Argentina]South AmericaWestern HemisphereWorldA geological and geophysical study in fluvial post-pampean sediments cropping out on the right bank of the Rio Areco was carried out. The sequence studied comprises the Guerrero and Río Salado members of the Luján Formation, in which three palaeosols are developed. The geophysical studies suggest an impoverishment of the detrital ferrimagnetic minerals (magnetite and titanomagnetite) in the parent material, due to the action of pedogenic processes, accompanied by the generation of two neominerales, one antiferromagnetic and the other ferrimagnetic. The ferrimagnetic mineral consists of particles of ultrafine magnetite (state of superparamagnetic domain, grain size approaching 0.01 μm) formed during periods of excess water. The antiferromagnetic minerals (hematite and/or goethite) were generated in periods of major water deficiency. The presence of these minerals would be indicating a warm and humid climate with a marked dryperiod. The oldest paleosol was developed on the Guerrero Member which correlates with the Puesto Callejón Viejo palaeosol that has an age between 10,000 and 8,000 years AP, in this profile. The Rio Salado Member and the two paleosols developed on it would have developed during the warm period known as, Megathermal, between 9,000 and 7,000 years BP. © 2004 Asociación Geológica Argentina.Fil:Walther, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Orgeira, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Lippai, H.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.2004info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p433_WaltherRev. Asoc. Geol. Argent. 2004;59(3):433-442reponame:Biblioteca Digital (UBA-FCEN)instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesinstacron:UBA-FCENenginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/2.5/ar2025-09-04T09:48:27Zpaperaa:paper_00044822_v59_n3_p433_WaltherInstitucionalhttps://digital.bl.fcen.uba.ar/Universidad públicaNo correspondehttps://digital.bl.fcen.uba.ar/cgi-bin/oaiserver.cgiana@bl.fcen.uba.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:18962025-09-04 09:48:31.65Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesfalse
dc.title.none.fl_str_mv Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
title Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
spellingShingle Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
Walther, A.M.
Environmental magnetism
Paleoclimate
Quaternary
Stratigraphy
detrital deposit
magnetite
paleoclimate
paleosol
proxy climate record
Quaternary
titanomagnetite
Argentina
Buenos Aires [Argentina]
South America
Western Hemisphere
World
title_short Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
title_full Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
title_fullStr Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
title_full_unstemmed Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
title_sort Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
dc.creator.none.fl_str_mv Walther, A.M.
Orgeira, M.J.
Lippai, H.F.
author Walther, A.M.
author_facet Walther, A.M.
Orgeira, M.J.
Lippai, H.F.
author_role author
author2 Orgeira, M.J.
Lippai, H.F.
author2_role author
author
dc.subject.none.fl_str_mv Environmental magnetism
Paleoclimate
Quaternary
Stratigraphy
detrital deposit
magnetite
paleoclimate
paleosol
proxy climate record
Quaternary
titanomagnetite
Argentina
Buenos Aires [Argentina]
South America
Western Hemisphere
World
topic Environmental magnetism
Paleoclimate
Quaternary
Stratigraphy
detrital deposit
magnetite
paleoclimate
paleosol
proxy climate record
Quaternary
titanomagnetite
Argentina
Buenos Aires [Argentina]
South America
Western Hemisphere
World
dc.description.none.fl_txt_mv A geological and geophysical study in fluvial post-pampean sediments cropping out on the right bank of the Rio Areco was carried out. The sequence studied comprises the Guerrero and Río Salado members of the Luján Formation, in which three palaeosols are developed. The geophysical studies suggest an impoverishment of the detrital ferrimagnetic minerals (magnetite and titanomagnetite) in the parent material, due to the action of pedogenic processes, accompanied by the generation of two neominerales, one antiferromagnetic and the other ferrimagnetic. The ferrimagnetic mineral consists of particles of ultrafine magnetite (state of superparamagnetic domain, grain size approaching 0.01 μm) formed during periods of excess water. The antiferromagnetic minerals (hematite and/or goethite) were generated in periods of major water deficiency. The presence of these minerals would be indicating a warm and humid climate with a marked dryperiod. The oldest paleosol was developed on the Guerrero Member which correlates with the Puesto Callejón Viejo palaeosol that has an age between 10,000 and 8,000 years AP, in this profile. The Rio Salado Member and the two paleosols developed on it would have developed during the warm period known as, Megathermal, between 9,000 and 7,000 years BP. © 2004 Asociación Geológica Argentina.
Fil:Walther, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Orgeira, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Lippai, H.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
description A geological and geophysical study in fluvial post-pampean sediments cropping out on the right bank of the Rio Areco was carried out. The sequence studied comprises the Guerrero and Río Salado members of the Luján Formation, in which three palaeosols are developed. The geophysical studies suggest an impoverishment of the detrital ferrimagnetic minerals (magnetite and titanomagnetite) in the parent material, due to the action of pedogenic processes, accompanied by the generation of two neominerales, one antiferromagnetic and the other ferrimagnetic. The ferrimagnetic mineral consists of particles of ultrafine magnetite (state of superparamagnetic domain, grain size approaching 0.01 μm) formed during periods of excess water. The antiferromagnetic minerals (hematite and/or goethite) were generated in periods of major water deficiency. The presence of these minerals would be indicating a warm and humid climate with a marked dryperiod. The oldest paleosol was developed on the Guerrero Member which correlates with the Puesto Callejón Viejo palaeosol that has an age between 10,000 and 8,000 years AP, in this profile. The Rio Salado Member and the two paleosols developed on it would have developed during the warm period known as, Megathermal, between 9,000 and 7,000 years BP. © 2004 Asociación Geológica Argentina.
publishDate 2004
dc.date.none.fl_str_mv 2004
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p433_Walther
url http://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p433_Walther
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/2.5/ar
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv Rev. Asoc. Geol. Argent. 2004;59(3):433-442
reponame:Biblioteca Digital (UBA-FCEN)
instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron:UBA-FCEN
reponame_str Biblioteca Digital (UBA-FCEN)
collection Biblioteca Digital (UBA-FCEN)
instname_str Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron_str UBA-FCEN
institution UBA-FCEN
repository.name.fl_str_mv Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
repository.mail.fl_str_mv ana@bl.fcen.uba.ar
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score 12.623145

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