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dc.contributor.author
Gioncada, A.
dc.contributor.author
Vezzoli, L.
dc.contributor.author
Mazzuoli, R.
dc.contributor.author
Omarini, Ricardo Hector

dc.contributor.author
Nonnotte, P.
dc.contributor.author
Guillou, H.
dc.date.available
2017-03-20T21:09:41Z
dc.date.issued
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.identifier.uri
http://hdl.handle.net/11336/14123
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/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Petrologia
dc.subject
Geoquimica
dc.subject
Vulcanismo
dc.subject
Andes Centrales
dc.subject.classification
Vulcanología

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Ciencias de la Tierra y relacionadas con el Medio Ambiente

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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
dc.date.updated
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/http://dx.doi.org/10.1130/L81.1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://lithosphere.geoscienceworld.org/content/2/3/153
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