| Título: | Composición y evolución de las lavas de la isla de Branco (Cabo Verde) |
| Autores: | Brändle, J.L. ; Hernán, F. ; Huertas Coronel, María José ; Ancochea Soto, Eumenio |
| Tipo de documento: | texto impreso |
| Editorial: | Sociedad Geológica de España, 2006-07 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Petrología , Tipo = Artículo |
| Resumen: |
The first data about the composition of lava flows from Branco Island (Cabo Verde) are presented in this work. Most lava flows in the sequence are alkali basalts (Fo84-76 olivine, En44-36 diopside, An83-31 plagioclase) showing geochemical affinity of typical ocean island basalts. The scarce most evolved members are mugearites (olivine absent, En41-31 clinopyroxene, An51-26 plagioclase, and kaersutite). The compositional variations between both the types are explained by crystal fractionation and extraction of pyroxene (up to 29%) and lesser proportions of olivine and Fe and Ti oxides (Cpx: 75; Ol: 21; OxFeTi: 4). The transition to mugearites from the most evolved basalts would mainly be due to extraction of pyroxene (24%) and Fe and Ti oxides (Cpx: 68; Ol: 3; Plag: 5; OxFeTi: 30). |
| En línea: | https://eprints.ucm.es/id/eprint/9943/1/2006_CV_Composicion_Branco_Geogaceta.pdf |
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