Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina

Autores
Gogorza, Claudia Susana; Lirio, J. M.; Nuñez, H.; Chaparro, Marcos Adrián Eduardo; Bertorello, Hector Raul; Sinito, Ana Maria
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Relative changes in geomagnetic field intensity over the last 16,000 years BP were recovered from the study of four cores obtained from Lake Escondido (South Argentina). Rock magnetic analysis shows that the main magnetic mineral is magnetite, the concentrations being mainly between 0.01 and 0.1%, and the grain size between 1 and 8_m. In order to fulfil the criteria for assessing the reliability of paleointensity data derived from sediments [Rev. Geophys. 31 (1993) 319], the samples whose concentrations and size are beyond this range were rejected. The remanent magnetisation at 20mT(NRM20mT)was normalised using the anhysteric remanent magnetisation (ARM100mT), the saturation of the isothermal remanent magnetisation (SIRM) and the low field magnetic susceptibility (k). Coherence function analysis indicates that the records are not significantly affected by local environmental conditions. This suggests that the variations in normalised remanence are mostly likely due to geomagnetic paleointensity fluctuations. ARM100mT is the best normaliser for the Lake Escondido sediments. The record of relative paleointensity (NRM20mT/ARM100mT) shows peaks and troughs whose amplitudes are similar to those in the St. Lawrence Estuary, Lake Baikal, Lake Pepin and Larsen-A Ice shelf data set and a stack of archeomagnetic data given as virtual axial dipole moment (VADM).
Fil: Gogorza, Claudia Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina
Fil: Lirio, J. M.. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina
Fil: Nuñez, H.. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina
Fil: Chaparro, Marcos Adrián Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina
Fil: Bertorello, Hector Raul. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Sinito, Ana Maria. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina
Materia
RELATIVE PALEOINTENSITY
HOLOCENE
SOUTH AMERICA
LAKE ESCONDIDO
COHERENCE
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/242567
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/242567
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, ArgentinaGogorza, Claudia SusanaLirio, J. M.Nuñez, H.Chaparro, Marcos Adrián EduardoBertorello, Hector RaulSinito, Ana MariaRELATIVE PALEOINTENSITYHOLOCENESOUTH AMERICALAKE ESCONDIDOCOHERENCEhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Relative changes in geomagnetic field intensity over the last 16,000 years BP were recovered from the study of four cores obtained from Lake Escondido (South Argentina). Rock magnetic analysis shows that the main magnetic mineral is magnetite, the concentrations being mainly between 0.01 and 0.1%, and the grain size between 1 and 8_m. In order to fulfil the criteria for assessing the reliability of paleointensity data derived from sediments [Rev. Geophys. 31 (1993) 319], the samples whose concentrations and size are beyond this range were rejected. The remanent magnetisation at 20mT(NRM20mT)was normalised using the anhysteric remanent magnetisation (ARM100mT), the saturation of the isothermal remanent magnetisation (SIRM) and the low field magnetic susceptibility (k). Coherence function analysis indicates that the records are not significantly affected by local environmental conditions. This suggests that the variations in normalised remanence are mostly likely due to geomagnetic paleointensity fluctuations. ARM100mT is the best normaliser for the Lake Escondido sediments. The record of relative paleointensity (NRM20mT/ARM100mT) shows peaks and troughs whose amplitudes are similar to those in the St. Lawrence Estuary, Lake Baikal, Lake Pepin and Larsen-A Ice shelf data set and a stack of archeomagnetic data given as virtual axial dipole moment (VADM).Fil: Gogorza, Claudia Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; ArgentinaFil: Lirio, J. M.. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; ArgentinaFil: Nuñez, H.. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; ArgentinaFil: Chaparro, Marcos Adrián Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; ArgentinaFil: Bertorello, Hector Raul. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Sinito, Ana Maria. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; ArgentinaElsevier Science2004-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/242567Gogorza, Claudia Susana; Lirio, J. M.; Nuñez, H.; Chaparro, Marcos Adrián Eduardo; Bertorello, Hector Raul; et al.; Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina; Elsevier Science; Physics of the Earth and Planetary Interiors; 145; 1-4; 7-2004; 219-2380031-9201CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0031920104001670info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pepi.2004.03.010info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:33:07Zoai:ri.conicet.gov.ar:11336/242567instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:33:07.448CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
title Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
spellingShingle Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
Gogorza, Claudia Susana
RELATIVE PALEOINTENSITY
HOLOCENE
SOUTH AMERICA
LAKE ESCONDIDO
COHERENCE
title_short Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
title_full Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
title_fullStr Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
title_full_unstemmed Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
title_sort Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina
dc.creator.none.fl_str_mv Gogorza, Claudia Susana
Lirio, J. M.
Nuñez, H.
Chaparro, Marcos Adrián Eduardo
Bertorello, Hector Raul
Sinito, Ana Maria
author Gogorza, Claudia Susana
author_facet Gogorza, Claudia Susana
Lirio, J. M.
Nuñez, H.
Chaparro, Marcos Adrián Eduardo
Bertorello, Hector Raul
Sinito, Ana Maria
author_role author
author2 Lirio, J. M.
Nuñez, H.
Chaparro, Marcos Adrián Eduardo
Bertorello, Hector Raul
Sinito, Ana Maria
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv RELATIVE PALEOINTENSITY
HOLOCENE
SOUTH AMERICA
LAKE ESCONDIDO
COHERENCE
topic RELATIVE PALEOINTENSITY
HOLOCENE
SOUTH AMERICA
LAKE ESCONDIDO
COHERENCE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Relative changes in geomagnetic field intensity over the last 16,000 years BP were recovered from the study of four cores obtained from Lake Escondido (South Argentina). Rock magnetic analysis shows that the main magnetic mineral is magnetite, the concentrations being mainly between 0.01 and 0.1%, and the grain size between 1 and 8_m. In order to fulfil the criteria for assessing the reliability of paleointensity data derived from sediments [Rev. Geophys. 31 (1993) 319], the samples whose concentrations and size are beyond this range were rejected. The remanent magnetisation at 20mT(NRM20mT)was normalised using the anhysteric remanent magnetisation (ARM100mT), the saturation of the isothermal remanent magnetisation (SIRM) and the low field magnetic susceptibility (k). Coherence function analysis indicates that the records are not significantly affected by local environmental conditions. This suggests that the variations in normalised remanence are mostly likely due to geomagnetic paleointensity fluctuations. ARM100mT is the best normaliser for the Lake Escondido sediments. The record of relative paleointensity (NRM20mT/ARM100mT) shows peaks and troughs whose amplitudes are similar to those in the St. Lawrence Estuary, Lake Baikal, Lake Pepin and Larsen-A Ice shelf data set and a stack of archeomagnetic data given as virtual axial dipole moment (VADM).
Fil: Gogorza, Claudia Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina
Fil: Lirio, J. M.. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina
Fil: Nuñez, H.. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina
Fil: Chaparro, Marcos Adrián Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina
Fil: Bertorello, Hector Raul. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Sinito, Ana Maria. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina
description Relative changes in geomagnetic field intensity over the last 16,000 years BP were recovered from the study of four cores obtained from Lake Escondido (South Argentina). Rock magnetic analysis shows that the main magnetic mineral is magnetite, the concentrations being mainly between 0.01 and 0.1%, and the grain size between 1 and 8_m. In order to fulfil the criteria for assessing the reliability of paleointensity data derived from sediments [Rev. Geophys. 31 (1993) 319], the samples whose concentrations and size are beyond this range were rejected. The remanent magnetisation at 20mT(NRM20mT)was normalised using the anhysteric remanent magnetisation (ARM100mT), the saturation of the isothermal remanent magnetisation (SIRM) and the low field magnetic susceptibility (k). Coherence function analysis indicates that the records are not significantly affected by local environmental conditions. This suggests that the variations in normalised remanence are mostly likely due to geomagnetic paleointensity fluctuations. ARM100mT is the best normaliser for the Lake Escondido sediments. The record of relative paleointensity (NRM20mT/ARM100mT) shows peaks and troughs whose amplitudes are similar to those in the St. Lawrence Estuary, Lake Baikal, Lake Pepin and Larsen-A Ice shelf data set and a stack of archeomagnetic data given as virtual axial dipole moment (VADM).
publishDate 2004
dc.date.none.fl_str_mv 2004-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/242567
Gogorza, Claudia Susana; Lirio, J. M.; Nuñez, H.; Chaparro, Marcos Adrián Eduardo; Bertorello, Hector Raul; et al.; Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina; Elsevier Science; Physics of the Earth and Planetary Interiors; 145; 1-4; 7-2004; 219-238
0031-9201
CONICET Digital
CONICET
url http://hdl.handle.net/11336/242567
identifier_str_mv Gogorza, Claudia Susana; Lirio, J. M.; Nuñez, H.; Chaparro, Marcos Adrián Eduardo; Bertorello, Hector Raul; et al.; Paleointensity studies on Holocene–Pleistocene sediments from lake Escondido, Argentina; Elsevier Science; Physics of the Earth and Planetary Interiors; 145; 1-4; 7-2004; 219-238
0031-9201
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0031920104001670
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pepi.2004.03.010
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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