Geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from Argentina

Palaeomagnetic and sedimentological studies carried out on the bottom sediments from three lakes in western Argentina are described. At the within‐lake level, five lithological units could be broadly defined and were useful as a general guide in defining detailed correlations based on the magnetic s...

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Autores principales: Creer, K.M., Valencio, D.A., Sinito, A.M., Tucholka, P., Vilas, J.F.A.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00168009_v74_n1_p199_Creer
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00168009_v74_n1_p199_Creer2023-10-03T14:14:52Z Geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from Argentina Creer, K.M. Valencio, D.A. Sinito, A.M. Tucholka, P. Vilas, J.F.A. Palaeomagnetic and sedimentological studies carried out on the bottom sediments from three lakes in western Argentina are described. At the within‐lake level, five lithological units could be broadly defined and were useful as a general guide in defining detailed correlations based on the magnetic susceptibility (k) and intensity of remanent magnetization (J). In one of the three lakes, el Trebol, it was possible to derive a closer, lithologically based, correlation and this was consistent with that based on the magnetic parameters. Inter‐lake correlation was derived from the inclination and declination patterns considered as a pair, also taking account of a set of radiocarbon age determinations to remove any ambiguities. All the individual measurements were transformed to a time‐scale prior to stacking to produce type‐curves. The records for Laguna el Trebol and Brazo de Campanario extend back to about 6000 radiocarbon years before present while Lago Morenito provides a record extending back to about 14000 radiocarbon years before present. The records exhibit variations with similar overall characteristics to those previously obtained for Europe and North America, but there appears to be no correlation with the northern hemisphere patterns on a swing to swing basis. Both clockwise and anticlockwise precession of the geomagnetic vector is evident both from spectral analysis of declination/inclination pairs and VGP paths. Copyright © 1983, Wiley Blackwell. All rights reserved JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00168009_v74_n1_p199_Creer
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Palaeomagnetic and sedimentological studies carried out on the bottom sediments from three lakes in western Argentina are described. At the within‐lake level, five lithological units could be broadly defined and were useful as a general guide in defining detailed correlations based on the magnetic susceptibility (k) and intensity of remanent magnetization (J). In one of the three lakes, el Trebol, it was possible to derive a closer, lithologically based, correlation and this was consistent with that based on the magnetic parameters. Inter‐lake correlation was derived from the inclination and declination patterns considered as a pair, also taking account of a set of radiocarbon age determinations to remove any ambiguities. All the individual measurements were transformed to a time‐scale prior to stacking to produce type‐curves. The records for Laguna el Trebol and Brazo de Campanario extend back to about 6000 radiocarbon years before present while Lago Morenito provides a record extending back to about 14000 radiocarbon years before present. The records exhibit variations with similar overall characteristics to those previously obtained for Europe and North America, but there appears to be no correlation with the northern hemisphere patterns on a swing to swing basis. Both clockwise and anticlockwise precession of the geomagnetic vector is evident both from spectral analysis of declination/inclination pairs and VGP paths. Copyright © 1983, Wiley Blackwell. All rights reserved
format JOUR
author Creer, K.M.
Valencio, D.A.
Sinito, A.M.
Tucholka, P.
Vilas, J.F.A.
spellingShingle Creer, K.M.
Valencio, D.A.
Sinito, A.M.
Tucholka, P.
Vilas, J.F.A.
Geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from Argentina
author_facet Creer, K.M.
Valencio, D.A.
Sinito, A.M.
Tucholka, P.
Vilas, J.F.A.
author_sort Creer, K.M.
title Geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from Argentina
title_short Geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from Argentina
title_full Geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from Argentina
title_fullStr Geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from Argentina
title_full_unstemmed Geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from Argentina
title_sort geomagnetic secular variations 0–14 000 yr bp as recorded by lake sediments from argentina
url http://hdl.handle.net/20.500.12110/paper_00168009_v74_n1_p199_Creer
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AT sinitoam geomagneticsecularvariations014000yrbpasrecordedbylakesedimentsfromargentina
AT tucholkap geomagneticsecularvariations014000yrbpasrecordedbylakesedimentsfromargentina
AT vilasjfa geomagneticsecularvariations014000yrbpasrecordedbylakesedimentsfromargentina
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