Stratigraphy and rock magnetism in a profile at arroyo Tapalqué, Quaternary of Buenos Aires province: Palaeoenvironmental and palaeoclimatic implications

In the right bank of the Arroyo Tapalqué (Salto de Piedra, Olavarría, Buenos Aires province) is a section through fluvial sediments of the Luján Formation (upper and lower members) and aeolian deposits of La Postrera Formation. A geological and geophysical study was carried out to determination the...

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Detalles Bibliográficos
Autores principales: Orgeira, María Julia, Walther, Ana Maria, Tofalo, Ofelia Rita de las Mercedes, Vasquez, Carlos Alberto, Lippai, Horacio Francisco, Compagnucci, Rosa Hilda
Publicado: 2001
Materias:
Environmental magnetism
Palaeoclimates
Quaternary
Rock magnetism
Stratigraphy
magnetic mineral
paleoclimate
paleoenvironment
stratigraphy
Argentina
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v56_n3_p353_Orgeira
http://hdl.handle.net/20.500.12110/paper_00044822_v56_n3_p353_Orgeira
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_00044822_v56_n3_p353_Orgeira2023-06-08T14:25:32Z Stratigraphy and rock magnetism in a profile at arroyo Tapalqué, Quaternary of Buenos Aires province: Palaeoenvironmental and palaeoclimatic implications Orgeira, María Julia Walther, Ana Maria Tofalo, Ofelia Rita de las Mercedes Vasquez, Carlos Alberto Lippai, Horacio Francisco Compagnucci, Rosa Hilda Environmental magnetism Palaeoclimates Quaternary Rock magnetism Stratigraphy magnetic mineral paleoclimate paleoenvironment Quaternary stratigraphy Argentina In the right bank of the Arroyo Tapalqué (Salto de Piedra, Olavarría, Buenos Aires province) is a section through fluvial sediments of the Luján Formation (upper and lower members) and aeolian deposits of La Postrera Formation. A geological and geophysical study was carried out to determination the magnetic parameters of the sediments of both formations, in order to evaluate the environmental and climatic conditions at the time of deposition. Levels with high concentrations of ferromagnetic minerals are thought to be related to an increase in capacity of river transport probably due to higher rainfall. By contrast, a particular magnetic behaviour was detected in levels closely associated with pedogenetic processes (Suelo Puesto Callejón Viejo, SPCV, Suelo Puesto Berrondo, SPB and present soils). This behaviour is attributed to the partial dissolution of the ferromagnetic fraction (magnetic/titanomagnetite) and to possible formation of a high c oercitivity magnetic fraction (hematite?) as an associated process. These results are similar to those obtained for paleosols from the Buenos Aires Formation, probably because of parental material common to both. On the basis of present field and laboratory observations, together with previously available information, a detailed correlation is proposed between features observed in this section and palaeoclimatic fluctuations identified for Pleistocene/Holocene. 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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vasquez, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lippai, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Compagnucci, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2001 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v56_n3_p353_Orgeira http://hdl.handle.net/20.500.12110/paper_00044822_v56_n3_p353_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
Palaeoclimates
Quaternary
Rock magnetism
Stratigraphy
magnetic mineral
paleoclimate
paleoenvironment
Quaternary
stratigraphy
Argentina
spellingShingle Environmental magnetism
Palaeoclimates
Quaternary
Rock magnetism
Stratigraphy
magnetic mineral
paleoclimate
paleoenvironment
Quaternary
stratigraphy
Argentina
Orgeira, María Julia
Walther, Ana Maria
Tofalo, Ofelia Rita de las Mercedes
Vasquez, Carlos Alberto
Lippai, Horacio Francisco
Compagnucci, Rosa Hilda
Stratigraphy and rock magnetism in a profile at arroyo Tapalqué, Quaternary of Buenos Aires province: Palaeoenvironmental and palaeoclimatic implications
topic_facet Environmental magnetism
Palaeoclimates
Quaternary
Rock magnetism
Stratigraphy
magnetic mineral
paleoclimate
paleoenvironment
Quaternary
stratigraphy
Argentina
description In the right bank of the Arroyo Tapalqué (Salto de Piedra, Olavarría, Buenos Aires province) is a section through fluvial sediments of the Luján Formation (upper and lower members) and aeolian deposits of La Postrera Formation. A geological and geophysical study was carried out to determination the magnetic parameters of the sediments of both formations, in order to evaluate the environmental and climatic conditions at the time of deposition. Levels with high concentrations of ferromagnetic minerals are thought to be related to an increase in capacity of river transport probably due to higher rainfall. By contrast, a particular magnetic behaviour was detected in levels closely associated with pedogenetic processes (Suelo Puesto Callejón Viejo, SPCV, Suelo Puesto Berrondo, SPB and present soils). This behaviour is attributed to the partial dissolution of the ferromagnetic fraction (magnetic/titanomagnetite) and to possible formation of a high c oercitivity magnetic fraction (hematite?) as an associated process. These results are similar to those obtained for paleosols from the Buenos Aires Formation, probably because of parental material common to both. On the basis of present field and laboratory observations, together with previously available information, a detailed correlation is proposed between features observed in this section and palaeoclimatic fluctuations identified for Pleistocene/Holocene.
author Orgeira, María Julia
Walther, Ana Maria
Tofalo, Ofelia Rita de las Mercedes
Vasquez, Carlos Alberto
Lippai, Horacio Francisco
Compagnucci, Rosa Hilda
author_facet Orgeira, María Julia
Walther, Ana Maria
Tofalo, Ofelia Rita de las Mercedes
Vasquez, Carlos Alberto
Lippai, Horacio Francisco
Compagnucci, Rosa Hilda
author_sort Orgeira, María Julia
title Stratigraphy and rock magnetism in a profile at arroyo Tapalqué, Quaternary of Buenos Aires province: Palaeoenvironmental and palaeoclimatic implications
title_short Stratigraphy and rock magnetism in a profile at arroyo Tapalqué, Quaternary of Buenos Aires province: Palaeoenvironmental and palaeoclimatic implications
title_full Stratigraphy and rock magnetism in a profile at arroyo Tapalqué, Quaternary of Buenos Aires province: Palaeoenvironmental and palaeoclimatic implications
title_fullStr Stratigraphy and rock magnetism in a profile at arroyo Tapalqué, Quaternary of Buenos Aires province: Palaeoenvironmental and palaeoclimatic implications
title_full_unstemmed Stratigraphy and rock magnetism in a profile at arroyo Tapalqué, Quaternary of Buenos Aires province: Palaeoenvironmental and palaeoclimatic implications
title_sort stratigraphy and rock magnetism in a profile at arroyo tapalqué, quaternary of buenos aires province: palaeoenvironmental and palaeoclimatic implications
publishDate 2001
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v56_n3_p353_Orgeira
http://hdl.handle.net/20.500.12110/paper_00044822_v56_n3_p353_Orgeira
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