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

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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...

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Autores principales:	Walther, A.M., Orgeira, M.J., Lippai, H.F.
Formato:	Artículo publishedVersion
Publicado:	2004
Materias:	Environmental magnetism Paleoclimate Quaternary Stratigraphy detrital deposit magnetite paleoclimate paleosol proxy climate record titanomagnetite Argentina Buenos Aires [Argentina] South America Western Hemisphere World
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p433_Walther https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v59_n3_p433_Walther_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

id	I28-R145-paper_00044822_v59_n3_p433_Walther_oai
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spelling	I28-R145-paper_00044822_v59_n3_p433_Walther_oai2024-08-16 Walther, A.M. Orgeira, M.J. Lippai, H.F. 2004 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. application/pdf http://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p433_Walther info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Rev. Asoc. Geol. Argent. 2004;59(3):433-442 Environmental magnetism Paleoclimate Quaternary Stratigraphy detrital deposit magnetite paleoclimate paleosol proxy climate record Quaternary titanomagnetite Argentina Buenos Aires [Argentina] South America Western Hemisphere World Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v59_n3_p433_Walther_oai
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-145
collection	Repositorio Digital de la Universidad de Buenos Aires (UBA)
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
spellingShingle	Environmental magnetism Paleoclimate Quaternary Stratigraphy detrital deposit magnetite paleoclimate paleosol proxy climate record Quaternary titanomagnetite Argentina Buenos Aires [Argentina] South America Western Hemisphere World Walther, A.M. Orgeira, M.J. Lippai, H.F. Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
topic_facet	Environmental magnetism Paleoclimate Quaternary Stratigraphy detrital deposit magnetite paleoclimate paleosol proxy climate record Quaternary titanomagnetite Argentina Buenos Aires [Argentina] South America Western Hemisphere World
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.
format	Artículo Artículo publishedVersion
author	Walther, A.M. Orgeira, M.J. Lippai, H.F.
author_facet	Walther, A.M. Orgeira, M.J. Lippai, H.F.
author_sort	Walther, A.M.
title	Rock magnetism in late Cenozoic sediments at San Antonio de Areco, Buenos Aires province
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
publishDate	2004
url	http://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p433_Walther https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v59_n3_p433_Walther_oai
work_keys_str_mv	AT waltheram rockmagnetisminlatecenozoicsedimentsatsanantoniodearecobuenosairesprovince AT orgeiramj rockmagnetisminlatecenozoicsedimentsatsanantoniodearecobuenosairesprovince AT lippaihf rockmagnetisminlatecenozoicsedimentsatsanantoniodearecobuenosairesprovince
_version_	1809357040870490112

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

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