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Composition and evolution of Branco Island (Cape Verde)

dc.contributor.authorBrändle, José Luis
dc.contributor.authorHernán, Francisco
dc.contributor.authorHuertas, María José
dc.contributor.authorAncochea, Eumenio
dc.description.abstractThe 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_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.subject.otherOceanic islandsen_US
dc.subject.otherBarlovento Islandsen_US
dc.subject.otherCape Verdeen_US
dc.subject.otherAlkaline basaltsen_US
dc.titleComposición y evolución de las lavas de la isla de Branco (Cabo Verde)en_US
dc.titleComposition and evolution of Branco Island (Cape Verde)eng

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