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dc.contributor.authorGarcía, Valeria Adriana-
dc.contributor.authorGonzález, Santiago Nicolás-
dc.contributor.authorColombo Celso, Gaeta Tassinari-
dc.contributor.authorSato, Kei-
dc.contributor.authorSato, Ana María-
dc.contributor.authorGonzález, Pablo Diego-
dc.contributor.authorVarela, Ricardo-
dc.date.accessioned2020-08-31T14:45:00Z-
dc.date.available2020-08-31T14:45:00Z-
dc.date.issued2014-
dc.identifier.urihttp://rid.unrn.edu.ar/handle/20.500.12049/5680-
dc.language.isoenes_ES
dc.relation.ispartof9° South American Symposium on Isotope Geologyes_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/-
dc.titleU/Pb and Nd data from Peñas Blancas Pluton, North Patagonian Massif, Argentinaes_ES
dc.typeObjeto de conferenciaes_ES
dc.rights.licenseCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)-
dc.description.filiationGarcía, Valeria. Centro de Investigaciones Geológica (CIG), UNLP- CONICET; Argentina.es_ES
dc.description.filiationGonzález, Santiago. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.es_ES
dc.description.filiationColombo, Tassinari. Instituto de Geociencias; Brasil.es_ES
dc.description.filiationSato, Kei. Instituto de Geociencias; Brasil.es_ES
dc.description.filiationSato, Ana María. Centro de Investigaciones Geológica (CIG), UNLP- CONICET; Argentina.es_ES
dc.description.filiationGonzález, Pablo Diego. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.es_ES
dc.description.filiationVarela, Ricardo. Centro de Investigaciones Geológica (CIG), UNLP- CONICET; Argentina.es_ES
dc.subject.keywordU/Pb and Ndes_ES
dc.subject.keywordPeñas Blancas Plutones_ES
dc.subject.keywordNorth Patagonian Massifes_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
dc.subject.materiaCiencias Exactas y Naturaleses_ES
dc.origin.lugarDesarrolloUniversidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología.es_ES
dc.description.resumenThe Peñas Blancas pluton has been considered part of the Permian Pailemán Plutonic Complex and assigned to the Gondwanic magmatic cycle in the North Patagonian Massif of Río Negro province. This pluton is a NW-SE enlongated body with a curvature to the west in its southern section. Metasedimentary rocks of El Jagüelito Formation are the country rock, present through numerous enclaves and pendants, which may suggest a partial melt origin for the pluton. To the east, the El Jagüelito ductile-brittle shear zone separates it from the high-grade metamorphic rocks of Mina Gonzalito Complex. To the west it is covered by Jurassic volcanic rocks of Marifil Complex. The pluton is a two-mica bearing, strongly peraluminous S-type granite with A/CNK between 1.09 and 1.18. This intrusive body displays several facies, such as a coarse-grained one, characterized by the presence of K-feldspar crystals in porphyritic texture, and a fine-grained equigranular one. The western section of the pluton is foliated and grades into mylonites along two previously mapped ductile-shear zones. Slightly foliated, late-stage leucogranites with muscovite and garnet occur as small N-S dike intrusions. The isotopic analyses were carried out at Centro de Pesquisas Geocronológicas of São Paulo University. Five single zircon spots yield an Ordovician SHRIMP U-Pb crystallization age of 471.0 ± 2.8 Ma. This age is older than the Rb-Sr dates previously published for the same plutonic complex. The εNd(t) values are predominantly negative and range from -2.7 to -4.0, with TDM model ages between 1.42 and 1.52 Ga. This new result allows us to assign the Peñas Blancas pluton to the Famatinian magmatic cycle rather than the Gondwanic cycle in the North Patagonian Massif. It could be correlated to other Ordovician intrusive bodies from Punta Sierra Plutonic Complex.es_ES
dc.type.subtypeResumenes_ES
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