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dc.contributor.authorGonzález, Santiago Nicolás-
dc.contributor.authorGreco, Gerson Alan-
dc.contributor.authorSato, Ana María-
dc.contributor.authorGonzález, Pablo Diego-
dc.contributor.authorLlambías, Eduardo Jorge-
dc.contributor.authorVarela, Ricardo-
dc.contributor.authorStipp Basei, Miguel Angelo-
dc.date.accessioned2020-08-31T15:20:00Z-
dc.date.available2020-08-31T15:20:00Z-
dc.date.issued2014-
dc.identifier.urihttp://rid.unrn.edu.ar/handle/20.500.12049/5682-
dc.language.isoenes_ES
dc.relation.ispartof9th South American Symposium on Isotope Geologyes_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/-
dc.titleTriassic post-orogenic dyke swarm in Northpatagonian 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.filiationGonzález, Santiago Nicolás. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.es_ES
dc.description.filiationGreco, Gerson. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología.es_ES
dc.description.filiationSato, Ana Maria. Centro de Investigaciones Geológicas (UNLP-CONICET); Argentina.es_ES
dc.description.filiationGonzález, Pablo Diego. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología.es_ES
dc.description.filiationLlambías, Eduardo. Centro de Investigaciones Geológicas (UNLP-CONICET); Argentina.es_ES
dc.description.filiationVarela, Ricardo. Centro de Investigaciones Geológicas (UNLP-CONICET); Argentina.es_ES
dc.description.filiationStipp Basei, Miguel. Centro de Investigaciones Geológicas (UNLP-CONICET); Argentina.es_ES
dc.subject.keywordTriassices_ES
dc.subject.keywordMesosilicic Dykeses_ES
dc.subject.keywordNorthpatagonian 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.resumenMesosilicic dykes were described in the eastern region of the North Patagonian Massif by many authors. They constitute a regional dyke swarm of NW-SE trend of about 200 Km length and 50 Km width. They cut the already deformed Early Paleozoic basement rocks, Permian Pailemán Plutonic Complex, and in turn they are cut by sub-volcanic bodies of the Jurassic Marifil Complex. Dykes are composed of porphyritic andesites to trachyandesites with seriated groundmass. They contains frequents enclaves of country rocks, such as Cambro-Ordovician high grade metamorphic rocks of Mina Gonzalito Complex and Permian plutonic rocks. Published radiometric data from the dykes are K-Ar ages between 207 and 221 Ma. Zircon crystals from a dyke near Mina Gonzalito Mine were analysed in the Centro de Pesquisas Geocronologicas (USP) by LA-ICPMS U-Pb method. Three age groups are recognised: (1) Neoproterozoic to Cambrian ages from zircons with axial ratio 2 to 3 and complex oscillatory zoning. (2) Triassic ages from crystals with axial ratio 1 to 1.5, and wide oscillatory or sector zoning. (3) Jurassic ages from the borders of zircons with oscillatory zoning and axial ratio close to 1. On the basis of textural evidence, we consider the Concordia age of 241.5 ± 1.8 Ma (MSWD = 0.01) in the second group as the crystallization age of the dyke in the swarm. The older ages are interpreted as inheritance from the Mina Gonzalito Complex which is the country rock of this dyke, and the younger age is assigned to an extensive Jurassic hydrothermal processes. The NW orientation of the swarm is parallel to the previous Gondwanic orogenic axis proposed for this region. The Triassic dykes are linked to the post-orogenic magmatism associated with the extensional collapse of the Late Paleozoic orogeny, which precedes the generalized, Jurassic continental extension in Patagonia.es_ES
dc.type.subtypeResumenes_ES
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