A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals

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Pedosedimentary processes, recorded in a late Quaternary section near Zarate city, north Buenos Aires province are reconstructed in this study. Both field features and laboratory results were analyzed as a whole. Grain size, sand, silt and clay mineralogy, micromorphology, Rb and Sr concentrations,...

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Autores principales: Tófalo, O.R., Orgeira, M.J., Ramos, A.M., Alonso, M.S.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2008
Materias:
Loess-paleosols successions
Micromorphology
Mineralogy
Pampa Ondulada
Zárate
calcrete
Cenozoic
chemical weathering
grain size
interglacial
loess
marine isotope stage
micromorphology
paleosol
sediment analysis
sedimentation
Argentina
Buenos Aires [Argentina]
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v63_n3_p430_Tofalo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00044822_v63_n3_p430_Tofalo2023-06-12T16:40:16Z A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals Rev. Asoc. Geol. Argent. 2008;63(3):430-441 Tófalo, O.R. Orgeira, M.J. Ramos, A.M. Alonso, M.S. Loess-paleosols successions Micromorphology Mineralogy Pampa Ondulada Zárate calcrete Cenozoic chemical weathering grain size interglacial loess marine isotope stage micromorphology paleosol sediment analysis sedimentation Argentina Buenos Aires [Argentina] South America Pedosedimentary processes, recorded in a late Quaternary section near Zarate city, north Buenos Aires province are reconstructed in this study. Both field features and laboratory results were analyzed as a whole. Grain size, sand, silt and clay mineralogy, micromorphology, Rb and Sr concentrations, optical stimulated luminescence (OSL) ages as well as preliminary paleomagnetic analysis were performed in order to get a detailed information on processes involved. All studied paleosols were developed on loess horizons. Four definite breaks in sedimentation and a coupled development of paleosols were observed. On this basis four units showing different types of calcretes were defined. Welded paleosols at unit C, could be correlated to those studied at Baradero (Buenos Aires province) and Lozada (Córdoba province), which probably record the last interglacial stage before present, the Marine Isotopic Stage 5 (MIS5), studied on marine cores. The highest values of Rb/Sr ratio reflect changes due to chemical weathering processes and generally match paleosol levels occurrences. Development of ground water-related and pedogenic calcretes, as well as their association to smectite, illite and ferric oxide indicate drier weather conditions than present and strong seasonality. Finally, a tentative correlation between one of the paleosols and the marine isotope stage 11(MIS 11) is suggested. Fil:Tófalo, O.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Orgeira, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ramos, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Alonso, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v63_n3_p430_Tofalo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Loess-paleosols successions
Micromorphology
Mineralogy
Pampa Ondulada
Zárate
calcrete
Cenozoic
chemical weathering
grain size
interglacial
loess
marine isotope stage
micromorphology
paleosol
sediment analysis
sedimentation
Argentina
Buenos Aires [Argentina]
South America
spellingShingle Loess-paleosols successions
Micromorphology
Mineralogy
Pampa Ondulada
Zárate
calcrete
Cenozoic
chemical weathering
grain size
interglacial
loess
marine isotope stage
micromorphology
paleosol
sediment analysis
sedimentation
Argentina
Buenos Aires [Argentina]
South America
Tófalo, O.R.
Orgeira, M.J.
Ramos, A.M.
Alonso, M.S.
A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals
topic_facet Loess-paleosols successions
Micromorphology
Mineralogy
Pampa Ondulada
Zárate
calcrete
Cenozoic
chemical weathering
grain size
interglacial
loess
marine isotope stage
micromorphology
paleosol
sediment analysis
sedimentation
Argentina
Buenos Aires [Argentina]
South America
description Pedosedimentary processes, recorded in a late Quaternary section near Zarate city, north Buenos Aires province are reconstructed in this study. Both field features and laboratory results were analyzed as a whole. Grain size, sand, silt and clay mineralogy, micromorphology, Rb and Sr concentrations, optical stimulated luminescence (OSL) ages as well as preliminary paleomagnetic analysis were performed in order to get a detailed information on processes involved. All studied paleosols were developed on loess horizons. Four definite breaks in sedimentation and a coupled development of paleosols were observed. On this basis four units showing different types of calcretes were defined. Welded paleosols at unit C, could be correlated to those studied at Baradero (Buenos Aires province) and Lozada (Córdoba province), which probably record the last interglacial stage before present, the Marine Isotopic Stage 5 (MIS5), studied on marine cores. The highest values of Rb/Sr ratio reflect changes due to chemical weathering processes and generally match paleosol levels occurrences. Development of ground water-related and pedogenic calcretes, as well as their association to smectite, illite and ferric oxide indicate drier weather conditions than present and strong seasonality. Finally, a tentative correlation between one of the paleosols and the marine isotope stage 11(MIS 11) is suggested.
format Artículo
Artículo
publishedVersion
author Tófalo, O.R.
Orgeira, M.J.
Ramos, A.M.
Alonso, M.S.
author_facet Tófalo, O.R.
Orgeira, M.J.
Ramos, A.M.
Alonso, M.S.
author_sort Tófalo, O.R.
title A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals
title_short A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals
title_full A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals
title_fullStr A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals
title_full_unstemmed A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals
title_sort pedosedimentary succession of the late cenozoic of zárate (buenos aires): continental record of the mis5 and older interglacial intervals
publishDate 2008
url http://hdl.handle.net/20.500.12110/paper_00044822_v63_n3_p430_Tofalo
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