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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Autores principales: OrgeIra, M.J., Walther, A.M., Vásquez, C.A., Tommaso, I.D., Alonso, S., Sherwood, G., Yuguan, H., Vilas, J.F.A.
Formato: JOUR
Materias:
loess
magnetic mineral
paleoclimate
paleosol
Quaternary
Argentina
Acceso en línea: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 todo:paper_08959811_v11_n6_p561_OrgeIra
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spelling todo:paper_08959811_v11_n6_p561_OrgeIra2023-10-03T15:42:28Z Mineral magnetic record of paleoclimate variation in loess and paleosol from the Buenos Aires formation (Buenos Aires, Argentina) OrgeIra, M.J. Walther, A.M. Vásquez, C.A. Tommaso, I.D. Alonso, S. Sherwood, G. Yuguan, H. Vilas, J.F.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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, M.J.
Walther, A.M.
Vásquez, C.A.
Tommaso, I.D.
Alonso, S.
Sherwood, G.
Yuguan, H.
Vilas, J.F.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.
format JOUR
author OrgeIra, M.J.
Walther, A.M.
Vásquez, C.A.
Tommaso, I.D.
Alonso, S.
Sherwood, G.
Yuguan, H.
Vilas, J.F.A.
author_facet OrgeIra, M.J.
Walther, A.M.
Vásquez, C.A.
Tommaso, I.D.
Alonso, S.
Sherwood, G.
Yuguan, H.
Vilas, J.F.A.
author_sort OrgeIra, M.J.
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)
url http://hdl.handle.net/20.500.12110/paper_08959811_v11_n6_p561_OrgeIra
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AT waltheram mineralmagneticrecordofpaleoclimatevariationinloessandpaleosolfromthebuenosairesformationbuenosairesargentina
AT vasquezca mineralmagneticrecordofpaleoclimatevariationinloessandpaleosolfromthebuenosairesformationbuenosairesargentina
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AT yuguanh mineralmagneticrecordofpaleoclimatevariationinloessandpaleosolfromthebuenosairesformationbuenosairesargentina
AT vilasjfa mineralmagneticrecordofpaleoclimatevariationinloessandpaleosolfromthebuenosairesformationbuenosairesargentina
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