dc.creatorHauser, Natalia
dc.creatorMatteini, Massimo
dc.creatorOmarini, Ricardo Hector
dc.creatorPimentel, Márcio M.
dc.date.accessioned2017-03-20T17:48:31Z
dc.date.accessioned2018-11-06T12:04:57Z
dc.date.available2017-03-20T17:48:31Z
dc.date.available2018-11-06T12:04:57Z
dc.date.created2017-03-20T17:48:31Z
dc.date.issued2010-08
dc.identifierHauser, Natalia; Matteini, Massimo; Omarini, Ricardo Hector; Pimentel, Márcio M.; Constraints on metasomatized mantle under Central South America: evidence from Jurassic alkaline lamprophyre dykes from the Eastern Cordillera, NM Argentina; Springer Verlag Berlín; Contributions To Mineralogy And Petrology; 100; 3-4; 8-2010; 153-184
dc.identifier0930-0708
dc.identifierhttp://hdl.handle.net/11336/14092
dc.identifier1438-1168
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1862895
dc.description.abstractIn the Río Grande Valley, NW Argentina, several porphyritic panidiomorphic, ocelli-bearing dykes and sills intrude the Neoproterozoic to lower Paleozoic basement of the Eastern Cordillera. New petrographical and geochemical data permit us to classify these rocks as ocellar-analcime monchiquites, a feldspar-free variety of alkaline lamprophyre composed of Ti-rich-diopside/augite, Ti-rich biotite/phlogopite, forsteritic olivine, titanianpargasite and analcime, with abundant ocelli filled with analcime/carbonate. In terms of geochemical compositions they are characterized by LILE and LREE enrichment and lack of Nb-Ta and Eu anomalies. The 87Sr/86Sr and 143Nd/144Nd initial ratios range between 0.70377 to 0.70781 and 0.512506 and 0.512716 respectively, and TDM model ages vary between 0.25–0.64 Ga. A K-Ar age of 163±9 Ma suggests that these rocks are related to the pre-rifting stage of the Mesozoic-Cenozoic continental Salta Rift in NW Argentina. Partial melting of a heterogeneous enriched metasomatized lithospheric mantle, magma mixing and fractionation are envisaged to explain the petrographic, geochemical and isotope characteristics of these magmas.
dc.languageeng
dc.publisherSpringer Verlag Berlín
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s00710-010-0127-5
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00710-010-0127-5
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectPETROLOGIA
dc.subjectGEOQUÍMICA
dc.subjectGEOCRONOLOGÍA
dc.subjectANDES CENTRALES
dc.titleConstraints on metasomatized mantle under Central South America: evidence from Jurassic alkaline lamprophyre dykes from the Eastern Cordillera, NM Argentina
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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