Proyectos
Titaniferous magnetite and barite from the San Gregorio de Polanco dike swarm, Paraná Magmatic Province, Uruguay
Resumen
The San Gregorio de Polanco Dike Swarm (Tacuarembó Department, Uruguay) is the southernmost set of dikes in the Paraná Magmatic Province of Uruguay. Five major dikes have been identified with two main structural trends: N140º¿N170º and N50º¿N80º. The dikes have tholeiitic affinities and are composed of plagioclase (An55), augite and augite-pigeonite, relicts of olivine and opaque minerals. These rocks have high contents of Fe¿Ti oxides (titanomagnetites), the mineralogical and textural characteristics of which have been studied using SEM-EDS techniques. These features, along with other mineralogical and textural relationships, have been used to propose the following crystallisation sequence for the dikes: (i) crystallisation of olivine, plagioclase and Ca-rich pyroxene phenocrysts; (ii) precipitation of the first population of Ti-magnetite; (iii) crystallisation of plagioclase and pyroxene in the groundmass; (iv) partial dissolution of Ti-magnetite by reaction with magmatic fluids; (v) crystallisation of the second population of Ti-magnetite and finally, (vi) crystallisation of interstitial barite.
Convocatoria
Nombre de la convocatoria:CONVOCATORIA DEL PROGRAMA NACIONAL PARA LA VISIBILIDAD INTERNACIONAL DE LA PRODUCCIÓN ACADÉMICA MEDIANTE EL APOYO PARA TRADUCCIÓN O CORRECCIÓN DE ESTILO DE ARTÍCULOS DE INVESTIGACIÓN 2013-2015
Modalidad:Modalidad 2. Revisión de estilo de artículos completos, o traducción o revisión de estilo de resúmenes de artículos, que hayan sido aprobados para su publicación e integren un número próximo de revistas de la Universidad Nacional de Colombia indexadas en el IBN-Publindex.
Responsable