Rock magnetism in soils of the Pampean plain, Buenos Aires province, Argentina. Linking climate and magnetic behaviour

Results of the study of Argiudolls in two localities (Zárate and Verónica) of the Pampean plain, Argentina, are presented in this contribution. This is a typical area covered by loess. The magnetic studies carried out allowed to determine the presence of detrital magnetite and titanomagnetite, as we...

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Autores principales: Orgeira, María Julia, Vasquez, Carlos Alberto, Compagnucci, Rosa Hilda, Pereyra, Fernando X.
Publicado: 2009
Materias:
Argentina
Argiudoll
Environmental magnetism
Pampean plain
Soils
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10268774_v26_n1_p65_Orgeira
http://hdl.handle.net/20.500.12110/paper_10268774_v26_n1_p65_Orgeira
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_10268774_v26_n1_p65_Orgeira
record_format dspace
spelling paper:paper_10268774_v26_n1_p65_Orgeira2025-07-30T18:36:15Z Rock magnetism in soils of the Pampean plain, Buenos Aires province, Argentina. Linking climate and magnetic behaviour Orgeira, María Julia Vasquez, Carlos Alberto Compagnucci, Rosa Hilda Pereyra, Fernando X. Argentina Argiudoll Environmental magnetism Pampean plain Soils Results of the study of Argiudolls in two localities (Zárate and Verónica) of the Pampean plain, Argentina, are presented in this contribution. This is a typical area covered by loess. The magnetic studies carried out allowed to determine the presence of detrital magnetite and titanomagnetite, as well as maghemite, pedogenic goethite and superparamagnetic particles (SP). In Verónica soils, a depletion of ferromagnetic minerals is recorded. The dominant process in these soils has been the reductive loss of detrital magnetite and titanomagnetite. This is associated with a greater degree of evolution of the soil, which is determined by the concentration and type of detected clays. The higher clay concentration in these soils facilitated reducing conditions and a greater loss of detrital magnetic particles. The loss is reinforced under poor drainage conditions. In the poorly drained soil of Zárate, a concentration of magnetic particles is observed in the Bt horizon, which is associated with an illuviation process. The well drained soil of the same locality shows neoformation of SP particles. These particles would have an ephemeral life until a new wet period in the annual cycle occurs. Although some characteristics of the magnetic signal appear reinforced by the conditions of drainage, this aspect does not seem to be too significant, at least in the Pampean region with low topographic gradients. Fil:Orgeira, M.J. 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. Fil:Compagnucci, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pereyra, F.X. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10268774_v26_n1_p65_Orgeira http://hdl.handle.net/20.500.12110/paper_10268774_v26_n1_p65_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 Argentina
Argiudoll
Environmental magnetism
Pampean plain
Soils
spellingShingle Argentina
Argiudoll
Environmental magnetism
Pampean plain
Soils
Orgeira, María Julia
Vasquez, Carlos Alberto
Compagnucci, Rosa Hilda
Pereyra, Fernando X.
Rock magnetism in soils of the Pampean plain, Buenos Aires province, Argentina. Linking climate and magnetic behaviour
topic_facet Argentina
Argiudoll
Environmental magnetism
Pampean plain
Soils
description Results of the study of Argiudolls in two localities (Zárate and Verónica) of the Pampean plain, Argentina, are presented in this contribution. This is a typical area covered by loess. The magnetic studies carried out allowed to determine the presence of detrital magnetite and titanomagnetite, as well as maghemite, pedogenic goethite and superparamagnetic particles (SP). In Verónica soils, a depletion of ferromagnetic minerals is recorded. The dominant process in these soils has been the reductive loss of detrital magnetite and titanomagnetite. This is associated with a greater degree of evolution of the soil, which is determined by the concentration and type of detected clays. The higher clay concentration in these soils facilitated reducing conditions and a greater loss of detrital magnetic particles. The loss is reinforced under poor drainage conditions. In the poorly drained soil of Zárate, a concentration of magnetic particles is observed in the Bt horizon, which is associated with an illuviation process. The well drained soil of the same locality shows neoformation of SP particles. These particles would have an ephemeral life until a new wet period in the annual cycle occurs. Although some characteristics of the magnetic signal appear reinforced by the conditions of drainage, this aspect does not seem to be too significant, at least in the Pampean region with low topographic gradients.
author Orgeira, María Julia
Vasquez, Carlos Alberto
Compagnucci, Rosa Hilda
Pereyra, Fernando X.
author_facet Orgeira, María Julia
Vasquez, Carlos Alberto
Compagnucci, Rosa Hilda
Pereyra, Fernando X.
author_sort Orgeira, María Julia
title Rock magnetism in soils of the Pampean plain, Buenos Aires province, Argentina. Linking climate and magnetic behaviour
title_short Rock magnetism in soils of the Pampean plain, Buenos Aires province, Argentina. Linking climate and magnetic behaviour
title_full Rock magnetism in soils of the Pampean plain, Buenos Aires province, Argentina. Linking climate and magnetic behaviour
title_fullStr Rock magnetism in soils of the Pampean plain, Buenos Aires province, Argentina. Linking climate and magnetic behaviour
title_full_unstemmed Rock magnetism in soils of the Pampean plain, Buenos Aires province, Argentina. Linking climate and magnetic behaviour
title_sort rock magnetism in soils of the pampean plain, buenos aires province, argentina. linking climate and magnetic behaviour
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10268774_v26_n1_p65_Orgeira
http://hdl.handle.net/20.500.12110/paper_10268774_v26_n1_p65_Orgeira
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AT vasquezcarlosalberto rockmagnetisminsoilsofthepampeanplainbuenosairesprovinceargentinalinkingclimateandmagneticbehaviour
AT compagnuccirosahilda rockmagnetisminsoilsofthepampeanplainbuenosairesprovinceargentinalinkingclimateandmagneticbehaviour
AT pereyrafernandox rockmagnetisminsoilsofthepampeanplainbuenosairesprovinceargentinalinkingclimateandmagneticbehaviour
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