Estudios geoquímicos de Tierras Raras e Itrio en rocas de la Formación El Cortijo, Sierras Septentrionales de la provincia de Buenos Aires

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dc.date.accessioned2018-05-30T16:36:40Z
dc.date.available2018-05-30T16:36:40Z
dc.identifier.urihttps://digital.cic.gba.gob.ar/handle/11746/8145
dc.titleEstudios geoquímicos de Tierras Raras e Itrio en rocas de la Formación El Cortijo, Sierras Septentrionales de la provincia de Buenos Aireses
dc.typeDocumento de conferenciaes
dcterms.abstractGeochemical studies of Rare Earth Elements and Yttrium in rocks of the El Cori& Formation, Sierras Septentrionales de la Provincia de Buenos Aires. El Cortijo Formation (NO Tana city) has contrasting mineralogical, structural and metamorphic features with those of the rest the Sierras Septentrionales de la Provincia de Buenos Ai-res 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) them 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 of heavy rare earth element (HREE) for OVA. The GB presents a different design, similar to that of a Greenstone Belt them 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 of 0.89 and 1.14, respectively. These characteristics indicate that GB them corresponds to C-Cheri sensustricto, while GVA chert is comparable with S-Chert due to 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.en
dcterms.creator.authorLajoinie, María Florenciaes
dcterms.creator.authorLanfranchini, Mabel Elenaes
dcterms.creator.authorEtcheverry, Ricardo O.es
dcterms.creator.authorBenitez, Manuela E.es
dcterms.creator.authorDe la Cal, Hernan G.es
dcterms.extent3 p.es
dcterms.isPartOf.issueXX Congreso Geologico Argentinoes
dcterms.isPartOf.seriesCongreso Geologico Argentinoes
dcterms.issued2017-08-07
dcterms.languageEspañoles
dcterms.licenseAttribution-NonCommercial-NoDerivatives 4.0 International (BY-NC-ND 4.0)es
dcterms.subjectSistema de Tandiliaes
dcterms.subjectPaleoproterozoicoes
dcterms.subjectgeoquímicaes
dcterms.subjectchertses
dcterms.subjectTandilia Systemen
dcterms.subjectPaleoprorozoicen
dcterms.subjectgeochemistryen
dcterms.subjectchertsen
dcterms.subject.materiaGeologíaes
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