Emplacement conditions and exhumation of the Varvarco Tonalite and associated plutons from the Cordillera del Viento, Southern Central Andes

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dc.contributor.authorAssis, Omar Sebastian
dc.contributor.authorZaffarana, Claudia Beatriz
dc.contributor.authorOrts, Darí­o
dc.contributor.authorPuigdomenech, Carla
dc.contributor.authorGonzález, Ví­ctor Ruiz
dc.contributor.authorGallastegui, Gloria
dc.contributor.authorHauser, Natalia
dc.contributor.authorKiseeva, Ekaterina S.
dc.contributor.authorMolina, José Francisco
dc.contributor.authorPernich, Sebastián
dc.contributor.funderUniversidad Nacional de Río Negroen
dc.contributor.funderConsejo Nacional de Investigaciones Científicas y Técnicasen
dc.contributor.funderMinisterio de Economía y Competitividaden
dc.contributor.funderConsejería de Economía, Conocimiento, Empresas y Universidad, Junta de Andalucíaen
dc.contributor.funderConselho Nacional de Desenvolvimento Científico e Tecnológicoen
dc.contributor.funderCoordenação de Aperfeiçoamento de Pessoal de Nível Superioren
dc.contributor.funderFundación Española para la Ciencia y la Tecnologíaen
dc.contributor.funderEuropean Regional Development Funden
dc.date.accessioned2022-04-19T15:00:31Z
dc.date.available2022-04-19T15:00:31Z
dc.date.issued2022-03-14
dc.date.updated2022-04-19T13:07:08Z
dc.description.abstractDuring the Late Cretaceous Andean orogeny, the compressive deformation associated with the shallowing of the subducting slab caused the development of the arc-related igneous rocks known as the Naunauco Belt. This study presents petrographic, mineralogical and anisotropy of magnetic susceptibility data for the Varvarco Intrusives (the Varvarco Tonalite, Butalón Tonalite and Radales Aplite), which crop out in the Cordillera del Viento, Neuquén Province, Argentina. The assembly of plutons was formed by mafic magma episodic injection. Amphibole and biotite compositions suggest that the Varvarco Tonalite is related to calc-alkaline, I-type magmas, typical of subduction environments. Different geothermobarometers based on amphibole and plagioclase compositions for the Varvarco Tonalite suggest shallow emplacement conditions (∼2–3 kbar, equivalent to ∼12 km depth). Apatite fission-track analyses give exhumation ages of 67.5 ± 8 Ma for the Varvarco Tonalite and 50.3 ± 5.9 Ma for the Butalón Tonalite. A calculated continuous fast exhumation rate of at least 330 °C Ma−1 is consistent with the shallow emplacement conditions, textural data and geobarometric estimations. In agreement with the thermal profile, the magmatic system was exhumed by ∼12 km within c. 2.1 Ma implying a geothermal gradient of ∼62.5 °C km−1. The last step of exhumation occurred between ∼65.3 and 56.9 Ma. The magmatic fabrics observed in the studied plutons reflect mostly magma chamber processes. The Varvarco Intrusives represent satellite calc-alkaline plutons of the North Patagonian Batholith which were emplaced syn- to post-tectonically with respect to a major deformation stage of the Southern Central Andes.en
dc.description.sponsorshipUniversidad Nacional de Río Negro (PI-40-A-466; PI-40-A-547; PI-40-A-631; PI-40-A-798; PI-40-A-916); Consejo Nacional de Investigaciones Científicas y Técnicas (PIP CONICET 2015-2017 11220150100736CO); Fundación Española para la Ciencia y la Tecnología (PICT 2019-01809; project CGL 2012-38396-C01); Ministerio de Economía y Competitividad (grant numbers: CGL2013-40785-P and CGL2017-84469-P); Consejería de Economía, Conocimiento, Empresas y Universidad, Junta de Andalucía (grant number: RNM2163) Conselho Nacional de Desenvolvimento Científico e Tecnológico (grants 309878/2019-5); Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior – Brasil (CAPES – Finance Code 001)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationAssis, O. S., Zaffarana, C. B., Orts, D., Puigdomenech, C., González, V. R., Gallastegui, G., Hauser, N., Kiseeva, E. S., Molina, J. F. and Pernich, S. (2022) 'Emplacement conditions and exhumation of the Varvarco Tonalite and associated plutons from the Cordillera del Viento, Southern Central Andes', Geological Magazine, 159(5), pp. 645-672. doi: 10.1017/S0016756821001163en
dc.identifier.doi10.1017/S0016756821001163en
dc.identifier.eissn1469-5081
dc.identifier.endpage672en
dc.identifier.issn0016-7568
dc.identifier.issued5en
dc.identifier.journaltitleGeological Magazineen
dc.identifier.startpage645en
dc.identifier.urihttps://hdl.handle.net/10468/13097
dc.identifier.volume159en
dc.language.isoenen
dc.publisherCambridge University Pressen
dc.rights© 2022, the Authors. Published by Cambridge University Press. This material is free to view and download for personal use only. Not for re-distribution, re-sale or use in derivative works.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectAMSen
dc.subjectAndean orogenyen
dc.subjectFast exhumation rateen
dc.subjectFission-track datingen
dc.subjectGranitoidsen
dc.titleEmplacement conditions and exhumation of the Varvarco Tonalite and associated plutons from the Cordillera del Viento, Southern Central Andesen
dc.typeArticle (peer-reviewed)en
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