dc.creatorDahlquist, Juan Andrés
dc.creatorAlasino, Pablo Horacio
dc.creatorBasei, Miguel A.S.
dc.creatorMorales Camera, Matías Martín
dc.creatorMacchioli Grande, Marcos Simón
dc.creatorCampos Neto, Mario da Costa
dc.date.accessioned2019-11-08T17:03:51Z
dc.date.accessioned2022-10-15T01:18:47Z
dc.date.available2019-11-08T17:03:51Z
dc.date.available2022-10-15T01:18:47Z
dc.date.created2019-11-08T17:03:51Z
dc.date.issued2018-10
dc.identifierDahlquist, Juan Andrés; Alasino, Pablo Horacio; Basei, Miguel A.S.; Morales Camera, Matías Martín; Macchioli Grande, Marcos Simón; et al.; Petrological, geochemical, isotopic, and geochronological constraints for the Late Devonian–Early Carboniferous magmatism in SW Gondwana (27–32°LS): An example of geodynamic switching; Springer; International Journal of Earth Sciences; 107; 7; 10-2018; 2575-2603
dc.identifier1437-3254
dc.identifierhttp://hdl.handle.net/11336/88345
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/4329153
dc.description.abstractWe report a study integrating 13 new U–Pb LA-MC-ICP-MS zircon ages and Hf-isotope data from dated magmatic zircons together with complete petrological and whole-rock geochemistry data for the dated granitic rocks. Sample selection was strongly based on knowledge reported in previous investigations. Latest Devonian–Early Carboniferous granite samples were collected along a transect of ~ 900 km, from the inner continental region (present-day Eastern Sierras Pampeanas) to the magmatic arc (now Western Sierras Pampeanas and Frontal Cordillera). Based on these data together with ca. 100 published whole-rock geochemical analyses we conclude that Late Devonian–Early Carboniferous magmatism at this latitude represents continuous activity (ranging from 322 to 379 Ma) on the pre-Andean margin of SW Gondwana, although important whole-rock and isotopic compositional variations occurred through time and space. Combined whole-rock chemistry and isotope data reveal that peraluminous A-type magmatism started in the intracontinental region during the Late Devonian, with subsequent development of synchronous Carboniferous peraluminous and metaluminous A-type magmatism in the retro-arc region and calc-alkaline magmatism in the western paleomargin. We envisage that magmatic evolution was mainly controlled by episodic fluctuations in the angle of subduction of the oceanic plate (between flat-slab and normal subduction), supporting a geodynamic switching model. Subduction fluctuations were relatively fast (ca. 7 Ma) during the Late Devonian and Early Carboniferous, and the complete magmatic switch-off and switch-on process lasted for ~ 57 Ma. Hf TDM values of zircon (igneous and inherited) from some Carboniferous peraluminous A-type granites in the retro-arc suggest that Gondwana continental lithosphere formed during previous orogenies was partly the source of the Devonian–Carboniferous granitic magmas, thus precluding the generation of the parental magmas from exotic terranes.
dc.languageeng
dc.publisherSpringer
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://link.springer.com/10.1007/s00531-018-1615-9
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s00531-018-1615-9
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectCALC-ALKALINE, METALUMINOUS AND STRONGLY PERALUMINOUS A-TYPE GRANITES
dc.subjectDEVONIAN; CARBONIFEROUS TIME
dc.subjectGEODYNAMICS SWITCHING MODEL
dc.subjectPRE-ANDEAN MARGIN OF SW GONDWANA
dc.titlePetrological, geochemical, isotopic, and geochronological constraints for the Late Devonian–Early Carboniferous magmatism in SW Gondwana (27–32°LS): An example of geodynamic switching
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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