Ver registro simple Gioncada, A. Vezzoli, L. Mazzuoli, R. Omarini, Ricardo Hector Nonnotte, P. Guillou, H. 2017-03-20T21:09:41Z 2010-05
dc.identifier.citation Gioncada, A.; Vezzoli, L.; Mazzuoli, R.; Omarini, Ricardo Hector; Nonnotte, P.; et al.; Pliocene intraplate-type volcanism in the Andean foreland at 26°10′S, 64°40′W (NW Argentina): Implications for magmatic and structural evolution of the Central Andes; The Geological Society of America; Lithosphere; 2; 3; 5-2010; 153-171
dc.identifier.issn 1941-8264
dc.description.abstract The Antilla magmatic complex (26°10′S, 64°40′W, NW Argentina) attests to magma eruption at ca. 4.7 Ma in the Central Andes backarc region, 300 km E of the active arc. The Antilla lavas have an alkaline, predominantly mafic composition and record the most primitive isotopic ratios (87Sr/86Sr = 0.704360 and 143Nd/144Nd = 0.512764) of Central Andes Neogene backarc volcanism between 24°S and 27°S. They show trace-element patterns recalling backarc Pliocene-Quaternary intraplate mafic rocks, but they show lower silica and higher alkali contents, and are interpreted to derive from the depleted subcontinental mantle. A revision of the structural and volcanological characteristics of the Central Andes between 24°S and 27°S shows that this region was, during the Miocene-Pliocene, the site of lithospheric processes that account for partial melting in the mantle wedge, in the subcontinental mantle, and in the continental crust. The existing geophysical and petrological data agree with a model in which magma production was related to a process of lithospheric delamination. The Antilla rocks are the easternmost volcanic products with intraplate characteristics, located beside a large zone of partial melting of the continental crust, at the intersection of the NW-trending Archibarca and NE-trending Tucumán transversal lineaments. Their age of 4.7 Ma corresponds to the acme of mafic monogenetic and silicic ignimbrite volcanism in the backarc at the same latitude. This provides new constraints for the spatial and temporal reconstruction of deformation events in the crust and of the lithospheric delamination process and its bearing on magmatic activity.
dc.format application/pdf
dc.language.iso eng
dc.publisher The Geological Society of America
dc.rights info:eu-repo/semantics/restrictedAccess
dc.subject PETROLOGIA
dc.subject GEOQUIMICA
dc.subject VULCANISMO
dc.subject.classification Vulcanología
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Pliocene intraplate-type volcanism in the Andean foreland at 26°10′S, 64°40′W (NW Argentina): Implications for magmatic and structural evolution of the Central Andes
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion 2017-03-20T14:51:07Z
dc.journal.volume 2
dc.journal.number 3
dc.journal.pagination 153-171
dc.journal.pais Estados Unidos
dc.journal.ciudad Boulder
dc.description.fil Fil: Gioncada, A.. Universita Degli Studi Di Pisa; Italia
dc.description.fil Fil: Vezzoli, L.. Università Dell'Insubria; Italia
dc.description.fil Fil: Mazzuoli, R.. Universita Degli Studi Di Pisa; Italia
dc.description.fil Fil: Omarini, Ricardo Hector. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil Fil: Nonnotte, P.. Université Européenne de Bretagne; Francia. Université de Brest; Francia. Institut Universitaire Européen de la Mer; Francia
dc.description.fil Fil: Guillou, H.. Centre National de la Recherche Scientifique; Francia
dc.journal.title Lithosphere
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/

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