Characterization of a loess-paleosols section including a new record of the last interglacial stage in Pampean plain, Argentina

A new record of the Marine Isotopic Stage 5, the last Interglacial Stage before present is presented in this paper. Sedimentological, micromorphological, trace elements analyses (Rb-Sr) and magnetic polarity determination were performed on Buenos Aires and Ensenada Formation (Late Cenozoic) deposits...

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Autores principales: Tofalo, Ofelia Rita de las Mercedes, Orgeira, María Julia, Compagnucci, Rosa Hilda, Alonso, Maria Susana, Ramos, Adriana María
Publicado: 2011
Materias:
Chaco-Pampean Basin
Last interglacial paleoclimate
MIS 5
Sedimentary-pedogenetic sequence
calcrete
Last Interglacial
loess
marine isotope stage
paleoclimate
paleoenvironment
paleosol
pedogenesis
sedimentary sequence
Argentina
Chaco [Argentina]
Sierras Pampeanas
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v31_n1_p81_Tofalo
http://hdl.handle.net/20.500.12110/paper_08959811_v31_n1_p81_Tofalo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08959811_v31_n1_p81_Tofalo
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spelling paper:paper_08959811_v31_n1_p81_Tofalo2023-06-08T15:48:33Z Characterization of a loess-paleosols section including a new record of the last interglacial stage in Pampean plain, Argentina Tofalo, Ofelia Rita de las Mercedes Orgeira, María Julia Compagnucci, Rosa Hilda Alonso, Maria Susana Ramos, Adriana María Chaco-Pampean Basin Last interglacial paleoclimate MIS 5 Sedimentary-pedogenetic sequence calcrete Last Interglacial loess marine isotope stage paleoclimate paleoenvironment paleosol pedogenesis sedimentary sequence Argentina Chaco [Argentina] Sierras Pampeanas A new record of the Marine Isotopic Stage 5, the last Interglacial Stage before present is presented in this paper. Sedimentological, micromorphological, trace elements analyses (Rb-Sr) and magnetic polarity determination were performed on Buenos Aires and Ensenada Formation (Late Cenozoic) deposits in the southern Chaco-Pampean Basin (Argentina). This work aims to unravel paleoclimatic and paleoenvironmental information from the analyzed data. The studied deposits encompass a complex and cyclic 8 m-thick sedimentary-pedogenetic sequence formed by loessic sediments and paleosols with volcano-pyroclastic provenance. Four tabular units, with net base and top, were defined from erosion surfaces. An OSL age >126 kyr was obtained from the upper middle part of unit B, which suggests that this unit as well as unit C, could have developed during the latest interglacial stage, equivalent to MIS 5. The occurrence of calcretes indicates periods of little clastic supply and seasonal arid or semiarid climate while iron oxides, smectites and illite-bearing pedogenetic calcretes point to annual rain rates between 100 and 500 mm. No calcretes of any origin occur in present soils of the same zone. According to our proposed interpretation of the available data, climate during MIS 5 was drier than today. The drier conditions may have been related to lower temperatures during summer. © 2010 Elsevier Ltd. Fil:Tófalo, O. 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:Compagnucci, R. 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. Fil:Ramos, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v31_n1_p81_Tofalo http://hdl.handle.net/20.500.12110/paper_08959811_v31_n1_p81_Tofalo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Chaco-Pampean Basin
Last interglacial paleoclimate
MIS 5
Sedimentary-pedogenetic sequence
calcrete
Last Interglacial
loess
marine isotope stage
paleoclimate
paleoenvironment
paleosol
pedogenesis
sedimentary sequence
Argentina
Chaco [Argentina]
Sierras Pampeanas
spellingShingle Chaco-Pampean Basin
Last interglacial paleoclimate
MIS 5
Sedimentary-pedogenetic sequence
calcrete
Last Interglacial
loess
marine isotope stage
paleoclimate
paleoenvironment
paleosol
pedogenesis
sedimentary sequence
Argentina
Chaco [Argentina]
Sierras Pampeanas
Tofalo, Ofelia Rita de las Mercedes
Orgeira, María Julia
Compagnucci, Rosa Hilda
Alonso, Maria Susana
Ramos, Adriana María
Characterization of a loess-paleosols section including a new record of the last interglacial stage in Pampean plain, Argentina
topic_facet Chaco-Pampean Basin
Last interglacial paleoclimate
MIS 5
Sedimentary-pedogenetic sequence
calcrete
Last Interglacial
loess
marine isotope stage
paleoclimate
paleoenvironment
paleosol
pedogenesis
sedimentary sequence
Argentina
Chaco [Argentina]
Sierras Pampeanas
description A new record of the Marine Isotopic Stage 5, the last Interglacial Stage before present is presented in this paper. Sedimentological, micromorphological, trace elements analyses (Rb-Sr) and magnetic polarity determination were performed on Buenos Aires and Ensenada Formation (Late Cenozoic) deposits in the southern Chaco-Pampean Basin (Argentina). This work aims to unravel paleoclimatic and paleoenvironmental information from the analyzed data. The studied deposits encompass a complex and cyclic 8 m-thick sedimentary-pedogenetic sequence formed by loessic sediments and paleosols with volcano-pyroclastic provenance. Four tabular units, with net base and top, were defined from erosion surfaces. An OSL age >126 kyr was obtained from the upper middle part of unit B, which suggests that this unit as well as unit C, could have developed during the latest interglacial stage, equivalent to MIS 5. The occurrence of calcretes indicates periods of little clastic supply and seasonal arid or semiarid climate while iron oxides, smectites and illite-bearing pedogenetic calcretes point to annual rain rates between 100 and 500 mm. No calcretes of any origin occur in present soils of the same zone. According to our proposed interpretation of the available data, climate during MIS 5 was drier than today. The drier conditions may have been related to lower temperatures during summer. © 2010 Elsevier Ltd.
author Tofalo, Ofelia Rita de las Mercedes
Orgeira, María Julia
Compagnucci, Rosa Hilda
Alonso, Maria Susana
Ramos, Adriana María
author_facet Tofalo, Ofelia Rita de las Mercedes
Orgeira, María Julia
Compagnucci, Rosa Hilda
Alonso, Maria Susana
Ramos, Adriana María
author_sort Tofalo, Ofelia Rita de las Mercedes
title Characterization of a loess-paleosols section including a new record of the last interglacial stage in Pampean plain, Argentina
title_short Characterization of a loess-paleosols section including a new record of the last interglacial stage in Pampean plain, Argentina
title_full Characterization of a loess-paleosols section including a new record of the last interglacial stage in Pampean plain, Argentina
title_fullStr Characterization of a loess-paleosols section including a new record of the last interglacial stage in Pampean plain, Argentina
title_full_unstemmed Characterization of a loess-paleosols section including a new record of the last interglacial stage in Pampean plain, Argentina
title_sort characterization of a loess-paleosols section including a new record of the last interglacial stage in pampean plain, argentina
publishDate 2011
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v31_n1_p81_Tofalo
http://hdl.handle.net/20.500.12110/paper_08959811_v31_n1_p81_Tofalo
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