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dc.creatorWhattam, Scott A.
dc.creatorGazel Dondi, Esteban
dc.creatorYi, Keewook
dc.creatorDenyer Chavarría, Percy
dc.date.accessioned2017-12-20T19:57:20Z
dc.date.available2017-12-20T19:57:20Z
dc.date.issued2016
dc.identifier.citationhttp://www.sciencedirect.com/science/article/pii/S002449371630130X?via%3Dihubes_ES
dc.identifier.issn0024-4937
dc.identifier.urihttp://hdl.handle.net/10669/73720
dc.description.abstractThe origin of minor leucocratic intrusions known as “plagiogranites” in oceanic complexes dominated by basaltic compositions have been debated in the literature. Here we use well preserved plagiogranites within the contrasting Santa Elena Ophiolite and the Nicoya Complex, NW Costa Rica, to investigate the origin and age of these leucocratic intrusions. Magmatic zircons of plagiogranites of the Santa Elena ophiolite and the Nicoya Complex, yield weighted mean SHRIMP 206Pb/238U ages of 125.3 ± 2.0 Ma and 90.9 ± 2.0 Ma to 88.5 ± 2.0 Ma (n = 5), respectively. These ages record the main magmatic phases of formation of these intrusions preserved in each complex. Relatively flat, unfractionated chondrite-normalized REE patterns of plagiogranites from both complexes mimic signatures of related mafic rocks, which is consistent with formation via fractional crystallization from a mafic source as opposed to partial melting of a mafic (basalt, amphibolite) protolith. In the case of the Nicoya Complex, modelling suggests that the Nicoya plagiogranites are consistent as ~ 10–15% residual liquids after fractional crystallization from its mafic parental source. Trace element systematics of the plagiogranites are consistent with an oceanic arc origin for Santa Elena and a mostly mid-ocean ridge to oceanic-plateau origin for Nicoya.es_ES
dc.description.sponsorshipNational Science Foundation/[EAR-1221414]/NSF/Estados Unidoses_ES
dc.description.sponsorshipNational Science Foundation/[EAR-1201903]/NSF/Estados Unidoses_ES
dc.language.isoen_USes_ES
dc.sourceLithos, Vol. 262, pp. 75-87es_ES
dc.subjectPlagiogranitees_ES
dc.subjectOphiolitees_ES
dc.subjectCentral Americaes_ES
dc.subjectCosta Ricaes_ES
dc.subjectNicoyaes_ES
dc.subjectSanta Elenaes_ES
dc.titleOrigin of plagiogranites in oceanic complexes: A case study of the Nicoya and Santa Elena terranes, Costa Ricaes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.typeArtículo científicoes_ES
dc.identifier.doi10.1016/j.lithos.2016.06.017
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Ciencias Geológicas (CICG)es_ES


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