Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina)

Environmental magnetic techniques were applied to a loess-paleosol sequence of the Chacopampean plain (Buenos Aires, Argentina). Mineral magnetic carriers and their grain size were identified in order to detect magnetic mineral fluctuations associated with climatic changes. Multidomain magnetite of...

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Detalles Bibliográficos
Autores principales: Orgeira, María Julia, Walther, Ana Maria, Vasquez, Carlos Alberto, Alonso, Maria Susana, Vilas, Juan Francisco A.
Publicado: 1998
Materias:
loess
magnetic mineral
paleoclimate
paleosol
Quaternary
Argentina
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v11_n6_p561_OrgeIra
http://hdl.handle.net/20.500.12110/paper_08959811_v11_n6_p561_OrgeIra
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08959811_v11_n6_p561_OrgeIra
record_format dspace
spelling paper:paper_08959811_v11_n6_p561_OrgeIra2023-06-08T15:48:07Z Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina) Orgeira, María Julia Walther, Ana Maria Vasquez, Carlos Alberto Alonso, Maria Susana Vilas, Juan Francisco A. loess magnetic mineral paleoclimate paleosol Quaternary Argentina Environmental magnetic techniques were applied to a loess-paleosol sequence of the Chacopampean plain (Buenos Aires, Argentina). Mineral magnetic carriers and their grain size were identified in order to detect magnetic mineral fluctuations associated with climatic changes. Multidomain magnetite of detrital origin dominates the record. In paleosols, a high coercivity fraction was identified. Horizons with no visual evidence of pedogenesis, but showing magnetic behavior analogous to that of paleosols were observed and are thought to represent environmental conditions similar to those prevailing during paleosol formation. The results suggest that the magnetic signal yielded by paleosols in these South American loess deposits is different from that in the Chinese loess. This may be due to differences in parent materials, diagenetic processes and/or differences in paleoclimatic conditions in both regions. 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:Vásquez, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Alonso, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vilas, J.F.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v11_n6_p561_OrgeIra http://hdl.handle.net/20.500.12110/paper_08959811_v11_n6_p561_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 mineral
paleoclimate
paleosol
Quaternary
Argentina
spellingShingle loess
magnetic mineral
paleoclimate
paleosol
Quaternary
Argentina
Orgeira, María Julia
Walther, Ana Maria
Vasquez, Carlos Alberto
Alonso, Maria Susana
Vilas, Juan Francisco A.
Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina)
topic_facet loess
magnetic mineral
paleoclimate
paleosol
Quaternary
Argentina
description Environmental magnetic techniques were applied to a loess-paleosol sequence of the Chacopampean plain (Buenos Aires, Argentina). Mineral magnetic carriers and their grain size were identified in order to detect magnetic mineral fluctuations associated with climatic changes. Multidomain magnetite of detrital origin dominates the record. In paleosols, a high coercivity fraction was identified. Horizons with no visual evidence of pedogenesis, but showing magnetic behavior analogous to that of paleosols were observed and are thought to represent environmental conditions similar to those prevailing during paleosol formation. The results suggest that the magnetic signal yielded by paleosols in these South American loess deposits is different from that in the Chinese loess. This may be due to differences in parent materials, diagenetic processes and/or differences in paleoclimatic conditions in both regions.
author Orgeira, María Julia
Walther, Ana Maria
Vasquez, Carlos Alberto
Alonso, Maria Susana
Vilas, Juan Francisco A.
author_facet Orgeira, María Julia
Walther, Ana Maria
Vasquez, Carlos Alberto
Alonso, Maria Susana
Vilas, Juan Francisco A.
author_sort Orgeira, María Julia
title Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina)
title_short Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina)
title_full Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina)
title_fullStr Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina)
title_full_unstemmed Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina)
title_sort mineral magnetic record of paleoclimate variation in loess and paleosol from the buenos aires formation (buenos aires, argentina)
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v11_n6_p561_OrgeIra
http://hdl.handle.net/20.500.12110/paper_08959811_v11_n6_p561_OrgeIra
work_keys_str_mv AT orgeiramariajulia mineralmagneticrecordofpaleoclimatevariationinloessandpaleosolfromthebuenosairesformationbuenosairesargentina
AT waltheranamaria mineralmagneticrecordofpaleoclimatevariationinloessandpaleosolfromthebuenosairesformationbuenosairesargentina
AT vasquezcarlosalberto mineralmagneticrecordofpaleoclimatevariationinloessandpaleosolfromthebuenosairesformationbuenosairesargentina
AT alonsomariasusana mineralmagneticrecordofpaleoclimatevariationinloessandpaleosolfromthebuenosairesformationbuenosairesargentina
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