Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations

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An environmental magnetic study of mainly fluvial "postpampean sediments" assigned to the Lujan Formation (Luján, Buenos Aires Province, Argentina) was carried out. The results obtained suggest a depletion of detrital ferromagnetic minerals during the pedogenetic processes. A characteristi...

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Autores principales: Orgeira, M.J., Walther, A.M., Tófalo, R.O., Vásquez, C.A., Berquó, T., Favier Dobois, C., Böhnel, H.
Formato: Artículo publishedVersion
Publicado: 2002
Materias:
Environmental magnetism
Paleoclimates
Quaternary
Rock magnetism
geomagnetism
paleoclimate
paleomagnetism
paleosol
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v57_n4_p451_Orgeira
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v57_n4_p451_Orgeira_oai
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Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_00044822_v57_n4_p451_Orgeira_oai
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spelling I28-R145-paper_00044822_v57_n4_p451_Orgeira_oai2024-08-16 Orgeira, M.J. Walther, A.M. Tófalo, R.O. Vásquez, C.A. Berquó, T. Favier Dobois, C. Böhnel, H. 2002 An environmental magnetic study of mainly fluvial "postpampean sediments" assigned to the Lujan Formation (Luján, Buenos Aires Province, Argentina) was carried out. The results obtained suggest a depletion of detrital ferromagnetic minerals during the pedogenetic processes. A characteristic magnetic signal can be distinguished in Holocene paleosols and soils of both eolian and fluvial "post-Pampean sediments" (Fm. Luján and Fm. La Postrera . This signal is analogous to that determined in loessic Pampean sediments assigned to the Buenos Aires Formation. It is inferred that the depletion of detrital ferromagnetic minerals is a general process in the Chacopampean area. This process may be associated with the genesis of a superparamagnetic fraction (SP), which could indicate dry periods during the climatic event. The depletion could also be associated with the genesis of a high coercitivy fraction, analogous with those determined in paleosols in the Pampean loess. Fil:Orgeira, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Walther, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tófalo, R.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vásquez, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00044822_v57_n4_p451_Orgeira info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Rev. Asoc. Geol. Argent. 2002;57(4):451-462 Environmental magnetism Paleoclimates Quaternary Rock magnetism geomagnetism paleoclimate paleomagnetism paleosol Quaternary Argentina Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations 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_v57_n4_p451_Orgeira_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
Paleoclimates
Quaternary
Rock magnetism
geomagnetism
paleoclimate
paleomagnetism
paleosol
Quaternary
Argentina
spellingShingle Environmental magnetism
Paleoclimates
Quaternary
Rock magnetism
geomagnetism
paleoclimate
paleomagnetism
paleosol
Quaternary
Argentina
Orgeira, M.J.
Walther, A.M.
Tófalo, R.O.
Vásquez, C.A.
Berquó, T.
Favier Dobois, C.
Böhnel, H.
Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations
topic_facet Environmental magnetism
Paleoclimates
Quaternary
Rock magnetism
geomagnetism
paleoclimate
paleomagnetism
paleosol
Quaternary
Argentina
description An environmental magnetic study of mainly fluvial "postpampean sediments" assigned to the Lujan Formation (Luján, Buenos Aires Province, Argentina) was carried out. The results obtained suggest a depletion of detrital ferromagnetic minerals during the pedogenetic processes. A characteristic magnetic signal can be distinguished in Holocene paleosols and soils of both eolian and fluvial "post-Pampean sediments" (Fm. Luján and Fm. La Postrera . This signal is analogous to that determined in loessic Pampean sediments assigned to the Buenos Aires Formation. It is inferred that the depletion of detrital ferromagnetic minerals is a general process in the Chacopampean area. This process may be associated with the genesis of a superparamagnetic fraction (SP), which could indicate dry periods during the climatic event. The depletion could also be associated with the genesis of a high coercitivy fraction, analogous with those determined in paleosols in the Pampean loess.
format Artículo
Artículo
publishedVersion
author Orgeira, M.J.
Walther, A.M.
Tófalo, R.O.
Vásquez, C.A.
Berquó, T.
Favier Dobois, C.
Böhnel, H.
author_facet Orgeira, M.J.
Walther, A.M.
Tófalo, R.O.
Vásquez, C.A.
Berquó, T.
Favier Dobois, C.
Böhnel, H.
author_sort Orgeira, M.J.
title Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations
title_short Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations
title_full Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations
title_fullStr Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations
title_full_unstemmed Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations
title_sort environmental magnetism of a paleosoil in the lujan formation (luján, buenos aires province), comparison with other areas in the province and palaeoclimatic considerations
publishDate 2002
url http://hdl.handle.net/20.500.12110/paper_00044822_v57_n4_p451_Orgeira
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v57_n4_p451_Orgeira_oai
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