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

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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Detalles Bibliográficos
Autores principales: Orgeira, María Julia, Walther, Ana Maria, Tofalo, Ofelia Rita de las Mercedes, Vasquez, Carlos Alberto
Publicado: 2002
Materias:
Environmental magnetism
Paleoclimates
Quaternary
Rock magnetism
geomagnetism
paleoclimate
paleomagnetism
paleosol
Argentina
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n4_p451_Orgeira
http://hdl.handle.net/20.500.12110/paper_00044822_v57_n4_p451_Orgeira
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00044822_v57_n4_p451_Orgeira
record_format dspace
spelling paper:paper_00044822_v57_n4_p451_Orgeira2023-06-08T14:25:39Z Environmental magnetism of a paleosoil in the Lujan Formation (Luján, Buenos Aires Province), comparison with other areas in the province and palaeoclimatic considerations Orgeira, María Julia Walther, Ana Maria Tofalo, Ofelia Rita de las Mercedes Vasquez, Carlos Alberto Environmental magnetism Paleoclimates Quaternary Rock magnetism geomagnetism paleoclimate paleomagnetism paleosol Quaternary Argentina 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. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n4_p451_Orgeira http://hdl.handle.net/20.500.12110/paper_00044822_v57_n4_p451_Orgeira
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (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, María Julia
Walther, Ana Maria
Tofalo, Ofelia Rita de las Mercedes
Vasquez, Carlos Alberto
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.
author Orgeira, María Julia
Walther, Ana Maria
Tofalo, Ofelia Rita de las Mercedes
Vasquez, Carlos Alberto
author_facet Orgeira, María Julia
Walther, Ana Maria
Tofalo, Ofelia Rita de las Mercedes
Vasquez, Carlos Alberto
author_sort Orgeira, María Julia
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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n4_p451_Orgeira
http://hdl.handle.net/20.500.12110/paper_00044822_v57_n4_p451_Orgeira
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AT waltheranamaria environmentalmagnetismofapaleosoilinthelujanformationlujanbuenosairesprovincecomparisonwithotherareasintheprovinceandpalaeoclimaticconsiderations
AT tofaloofeliaritadelasmercedes environmentalmagnetismofapaleosoilinthelujanformationlujanbuenosairesprovincecomparisonwithotherareasintheprovinceandpalaeoclimaticconsiderations
AT vasquezcarlosalberto environmentalmagnetismofapaleosoilinthelujanformationlujanbuenosairesprovincecomparisonwithotherareasintheprovinceandpalaeoclimaticconsiderations
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