dc.creator | Hauser, Natalia | |
dc.creator | Matteini, Massimo | |
dc.creator | Omarini, Ricardo Hector | |
dc.creator | Pimentel, Márcio M. | |
dc.date.accessioned | 2017-03-20T17:48:31Z | |
dc.date.accessioned | 2018-11-06T12:04:57Z | |
dc.date.available | 2017-03-20T17:48:31Z | |
dc.date.available | 2018-11-06T12:04:57Z | |
dc.date.created | 2017-03-20T17:48:31Z | |
dc.date.issued | 2010-08 | |
dc.identifier | Hauser, 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.identifier | 0930-0708 | |
dc.identifier | http://hdl.handle.net/11336/14092 | |
dc.identifier | 1438-1168 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1862895 | |
dc.description.abstract | In 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.language | eng | |
dc.publisher | Springer Verlag Berlín | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s00710-010-0127-5 | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00710-010-0127-5 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | PETROLOGIA | |
dc.subject | GEOQUÍMICA | |
dc.subject | GEOCRONOLOGÍA | |
dc.subject | ANDES CENTRALES | |
dc.title | Constraints on metasomatized mantle under Central South America: evidence from Jurassic alkaline lamprophyre dykes from the Eastern Cordillera, NM Argentina | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |