Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires

Autores
Lajoinie, María Florencia; Lanfranchini, Mabel Elena; Etcheverry, Ricardo Oscar; Benítez, Manuela E.; De la Cal, Hernán
Año de publicación
2017
Idioma
español castellano
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
El Cortijo Formation (NO Tandil city) has contrasting mineralogical, structural and metamorphic features with those of the rest the Sierras Septentrionales de la Provincia de Buenos Aires basement. It comprises mylonitized low grade metamorphic rocks preliminarily classified, in former time, as metacherts, metabasalts and metawakes. Detailed analysis of rare earth elements (REE) in gray-whitish (GB) and gray-green-bluish (GVA) chert samples allowed a certain classification of these rocks. The obtained multielement diagram, normalized to Post-Archean Australian Shale (PAAS), shows a flat distribution in light rare earth element (LREE) and depleted contents ofheavy rare earth element (HREE) for GVA. The GB presents a different design, similar to that of a Greenstone Belt chert of 3.71-3.81 Ga, characterized by very positive anomalies in La (1.29), Eu (3.87) and Y (Y/Ho 68.66), and LREE/HREE and MREE/HREE relationships of0.89 and 1.14, respectively. These characteristics indicate that GB chert corresponds to C-Chert sensu-stricto, while GVA chert is comparable with SChert dueto Y/Ho ratios - 31, and Eu anomalous contents between 1.2 and 1.4. This new geochemical evidence allows confirming the presence of cherts in the El Cortijo Formation that have been formed in an ocean basin before to the collision of Tandilia with the Rio de la Plata Craton.
Facultad de Ciencias Naturales y Museo
Comisión de Investigaciones Científicas de la provincia de Buenos Aires
Materia
Geoquímica
Tandilia System
Paleoprorozoic
Geochemistry
Cherts
Sistema de Tandilia
Paleoproterozoico
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/190479
Acceder
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spelling Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos AiresGeochemical studies of Rare Earth Elements and Yttrium in rocks of the El Cortijo Formation, Sierras Septentrionales de la provincia de Buenos AiresLajoinie, María FlorenciaLanfranchini, Mabel ElenaEtcheverry, Ricardo OscarBenítez, Manuela E.De la Cal, HernánGeoquímicaTandilia SystemPaleoprorozoicGeochemistryChertsSistema de TandiliaPaleoproterozoicoEl Cortijo Formation (NO Tandil city) has contrasting mineralogical, structural and metamorphic features with those of the rest the Sierras Septentrionales de la Provincia de Buenos Aires basement. It comprises mylonitized low grade metamorphic rocks preliminarily classified, in former time, as metacherts, metabasalts and metawakes. Detailed analysis of rare earth elements (REE) in gray-whitish (GB) and gray-green-bluish (GVA) chert samples allowed a certain classification of these rocks. The obtained multielement diagram, normalized to Post-Archean Australian Shale (PAAS), shows a flat distribution in light rare earth element (LREE) and depleted contents ofheavy rare earth element (HREE) for GVA. The GB presents a different design, similar to that of a Greenstone Belt chert of 3.71-3.81 Ga, characterized by very positive anomalies in La (1.29), Eu (3.87) and Y (Y/Ho 68.66), and LREE/HREE and MREE/HREE relationships of0.89 and 1.14, respectively. These characteristics indicate that GB chert corresponds to C-Chert sensu-stricto, while GVA chert is comparable with SChert dueto Y/Ho ratios - 31, and Eu anomalous contents between 1.2 and 1.4. This new geochemical evidence allows confirming the presence of cherts in the El Cortijo Formation that have been formed in an ocean basin before to the collision of Tandilia with the Rio de la Plata Craton.Facultad de Ciencias Naturales y MuseoComisión de Investigaciones Científicas de la provincia de Buenos Aires2017-08info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionObjeto de conferenciahttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdf33-35http://sedici.unlp.edu.ar/handle/10915/190479spainfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2026-02-26T11:39:52Zoai:sedici.unlp.edu.ar:10915/190479Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292026-02-26 11:39:52.837SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires
Geochemical studies of Rare Earth Elements and Yttrium in rocks of the El Cortijo Formation, Sierras Septentrionales de la provincia de Buenos Aires
title Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires
spellingShingle Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires
Lajoinie, María Florencia
Geoquímica
Tandilia System
Paleoprorozoic
Geochemistry
Cherts
Sistema de Tandilia
Paleoproterozoico
title_short Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires
title_full Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires
title_fullStr Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires
title_full_unstemmed Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires
title_sort Estudios geoquímicos de tierras raras e itrio en rocas de la Formación El Cortijo, sierras septentrionales de la provincia de Buenos Aires
dc.creator.none.fl_str_mv Lajoinie, María Florencia
Lanfranchini, Mabel Elena
Etcheverry, Ricardo Oscar
Benítez, Manuela E.
De la Cal, Hernán
author Lajoinie, María Florencia
author_facet Lajoinie, María Florencia
Lanfranchini, Mabel Elena
Etcheverry, Ricardo Oscar
Benítez, Manuela E.
De la Cal, Hernán
author_role author
author2 Lanfranchini, Mabel Elena
Etcheverry, Ricardo Oscar
Benítez, Manuela E.
De la Cal, Hernán
author2_role author
author
author
author
dc.subject.none.fl_str_mv Geoquímica
Tandilia System
Paleoprorozoic
Geochemistry
Cherts
Sistema de Tandilia
Paleoproterozoico
topic Geoquímica
Tandilia System
Paleoprorozoic
Geochemistry
Cherts
Sistema de Tandilia
Paleoproterozoico
dc.description.none.fl_txt_mv El Cortijo Formation (NO Tandil city) has contrasting mineralogical, structural and metamorphic features with those of the rest the Sierras Septentrionales de la Provincia de Buenos Aires basement. It comprises mylonitized low grade metamorphic rocks preliminarily classified, in former time, as metacherts, metabasalts and metawakes. Detailed analysis of rare earth elements (REE) in gray-whitish (GB) and gray-green-bluish (GVA) chert samples allowed a certain classification of these rocks. The obtained multielement diagram, normalized to Post-Archean Australian Shale (PAAS), shows a flat distribution in light rare earth element (LREE) and depleted contents ofheavy rare earth element (HREE) for GVA. The GB presents a different design, similar to that of a Greenstone Belt chert of 3.71-3.81 Ga, characterized by very positive anomalies in La (1.29), Eu (3.87) and Y (Y/Ho 68.66), and LREE/HREE and MREE/HREE relationships of0.89 and 1.14, respectively. These characteristics indicate that GB chert corresponds to C-Chert sensu-stricto, while GVA chert is comparable with SChert dueto Y/Ho ratios - 31, and Eu anomalous contents between 1.2 and 1.4. This new geochemical evidence allows confirming the presence of cherts in the El Cortijo Formation that have been formed in an ocean basin before to the collision of Tandilia with the Rio de la Plata Craton.
Facultad de Ciencias Naturales y Museo
Comisión de Investigaciones Científicas de la provincia de Buenos Aires
description El Cortijo Formation (NO Tandil city) has contrasting mineralogical, structural and metamorphic features with those of the rest the Sierras Septentrionales de la Provincia de Buenos Aires basement. It comprises mylonitized low grade metamorphic rocks preliminarily classified, in former time, as metacherts, metabasalts and metawakes. Detailed analysis of rare earth elements (REE) in gray-whitish (GB) and gray-green-bluish (GVA) chert samples allowed a certain classification of these rocks. The obtained multielement diagram, normalized to Post-Archean Australian Shale (PAAS), shows a flat distribution in light rare earth element (LREE) and depleted contents ofheavy rare earth element (HREE) for GVA. The GB presents a different design, similar to that of a Greenstone Belt chert of 3.71-3.81 Ga, characterized by very positive anomalies in La (1.29), Eu (3.87) and Y (Y/Ho 68.66), and LREE/HREE and MREE/HREE relationships of0.89 and 1.14, respectively. These characteristics indicate that GB chert corresponds to C-Chert sensu-stricto, while GVA chert is comparable with SChert dueto Y/Ho ratios - 31, and Eu anomalous contents between 1.2 and 1.4. This new geochemical evidence allows confirming the presence of cherts in the El Cortijo Formation that have been formed in an ocean basin before to the collision of Tandilia with the Rio de la Plata Craton.
publishDate 2017
dc.date.none.fl_str_mv 2017-08
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