Environmental magnetism: Loess and nalaeosols of the Buenos Aires Formation (Province of Buenos Aires)

Dia-genetic and/or pedogenetic processes produce ferromagnetic phases and/or the dissolution of magnetic minerals. The identification of these magnetic minerals, their grain size and variations through a sedimentary profile enable the determination of the climatic changes that took place during depo...

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Autor principal: Orgeira, M.J.
Formato: JOUR
Materias:
loess
magnetic property
paleosol
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v53_n1_p91_Orgeira
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v53_n1_p91_Orgeira
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spelling todo:paper_00044822_v53_n1_p91_Orgeira2023-10-03T13:57:24Z Environmental magnetism: Loess and nalaeosols of the Buenos Aires Formation (Province of Buenos Aires) Orgeira, M.J. loess magnetic property paleosol Argentina Dia-genetic and/or pedogenetic processes produce ferromagnetic phases and/or the dissolution of magnetic minerals. The identification of these magnetic minerals, their grain size and variations through a sedimentary profile enable the determination of the climatic changes that took place during deposition. The results presented here were obtained from a 7.6 m thick profile of typical loess (Buenos Aires Formation, Brunhes magnetic age) located beneath the city of Buenos Aires (Cervino street). On the basis of the variation of the magnetic properties [susceptibilities, isothermal rémanent magnetization (IRM), coercivity of the remanence (Bcr), rémanent acquisition coercive force (H'cr), Sratio, saturation isothermal rémanent magnetization (SIRM), low temperature properties, coercivity force (Be), and magnetization of saturation (Ms), among others] a decrease of ferrimagnetic (magnetite), and an increase of antiferromagnetic (goethite) minerals was observed in the palaeosol levels of the outcrop. Similar magnetic variations were detected in some others levels of the profile, previously not related to palaeosol formation. © 1998 Asociaciön Gcolögica Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v53_n1_p91_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 loess
magnetic property
paleosol
Argentina
spellingShingle loess
magnetic property
paleosol
Argentina
Orgeira, M.J.
Environmental magnetism: Loess and nalaeosols of the Buenos Aires Formation (Province of Buenos Aires)
topic_facet loess
magnetic property
paleosol
Argentina
description Dia-genetic and/or pedogenetic processes produce ferromagnetic phases and/or the dissolution of magnetic minerals. The identification of these magnetic minerals, their grain size and variations through a sedimentary profile enable the determination of the climatic changes that took place during deposition. The results presented here were obtained from a 7.6 m thick profile of typical loess (Buenos Aires Formation, Brunhes magnetic age) located beneath the city of Buenos Aires (Cervino street). On the basis of the variation of the magnetic properties [susceptibilities, isothermal rémanent magnetization (IRM), coercivity of the remanence (Bcr), rémanent acquisition coercive force (H'cr), Sratio, saturation isothermal rémanent magnetization (SIRM), low temperature properties, coercivity force (Be), and magnetization of saturation (Ms), among others] a decrease of ferrimagnetic (magnetite), and an increase of antiferromagnetic (goethite) minerals was observed in the palaeosol levels of the outcrop. Similar magnetic variations were detected in some others levels of the profile, previously not related to palaeosol formation. © 1998 Asociaciön Gcolögica Argentina.
format JOUR
author Orgeira, M.J.
author_facet Orgeira, M.J.
author_sort Orgeira, M.J.
title Environmental magnetism: Loess and nalaeosols of the Buenos Aires Formation (Province of Buenos Aires)
title_short Environmental magnetism: Loess and nalaeosols of the Buenos Aires Formation (Province of Buenos Aires)
title_full Environmental magnetism: Loess and nalaeosols of the Buenos Aires Formation (Province of Buenos Aires)
title_fullStr Environmental magnetism: Loess and nalaeosols of the Buenos Aires Formation (Province of Buenos Aires)
title_full_unstemmed Environmental magnetism: Loess and nalaeosols of the Buenos Aires Formation (Province of Buenos Aires)
title_sort environmental magnetism: loess and nalaeosols of the buenos aires formation (province of buenos aires)
url http://hdl.handle.net/20.500.12110/paper_00044822_v53_n1_p91_Orgeira
work_keys_str_mv AT orgeiramj environmentalmagnetismloessandnalaeosolsofthebuenosairesformationprovinceofbuenosaires
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