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dc.contributor.authorCastro Dorado, Antonio 
dc.contributor.authorOtamendi, Juan E.
dc.contributor.authorPinotti, Lucio P.
dc.contributor.authorD’Eramo, Fernando J.
dc.contributor.authorVujovich, Graciela I.
dc.contributor.authorTibaldi, Alina M.
dc.date.accessioned2019-01-31T13:09:41Z
dc.date.available2019-01-31T13:09:41Z
dc.date.issued2008-09
dc.identifier.citationAntonio Castro Dorado, J. Otamendi, L. P. Pinotti, F. J. D'Eramo, R. Martino, G. Vujovich, A. Tibaldi, A. Viñao. Top-down structures of mafic enclaves within the Valle Fértil magmatic complex (Early Ordovician, San Juan, Argentina). Geologica acta: an international earth science journal, ISSN 1695-6133, Vol. 6, Nº. 3, 2008, págs. 217-229. DOI: 10.1344/105.000000252es_ES
dc.identifier.issn1695-6133
dc.identifier.urihttp://hdl.handle.net/10272/15848
dc.description.abstractMagmatic structures related to the mechanical interaction between mafic magmas and granitoids have been studied in the Valle Fértil calc-alkaline igneous complex, Argentina. Excepcional outcrops with vertical walls of more than 300 m high allow us the study of three-dimensional geometries of individual blobs of mafic magma as well as the geometry of pipe-like structures in which mafic microgranular enclaves are concentrated in more than 50 times the normal abundance in the granodiorite mass. The shape of enclaves and pipe-like structures are interpreted as the ressult of top-to-down intrusions of a mafic magma into a granodiorite-tonalite mass. These sinking structures are the result of a reverselly stratified magma chamber with gabbros and diorites at the top and granodiorite-tonalite at the bottom. They may account for most of the structures found in microgranular enclaves and magma mingling zones that characterize calc-alkaline batholiths. Synplutonic intrusions from the top is the only plausible mechanism to account for the observed structures. The model may be of general application to calc-alkaline batholiths characterized by the presence of mafic microgranular enclaves. An implication of these reverselly stratified magma chambers is the presence of a petrological inversion which may be the consequence of cold diapirs emplaced below the mantle wedge in a suprasubduction setting.es_ES
dc.language.isoenges_ES
dc.publisherInstitut de Ciències de la Terra "Jaume Almera"es_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.otherEnclaveses_ES
dc.subject.otherSynplutonic intrusionses_ES
dc.subject.otherCalc-alkaline batholithses_ES
dc.subject.otherArgentinaes_ES
dc.subject.otherFamatinian beltes_ES
dc.titleTop-down structures of mafic enclaves within the Valle Fértil magmatic complex (Early Ordovician, San Juan, Argentina)es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.identifier.doi10.1344/105.000000252
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES


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