%0 Journal Article
%A Brandle, J.L.
%A Hernán, F.
%A Huertas Coronel, María José
%A Ancochea Soto, Eumenio
%T Composición y evolución de las lavas de la isla de Branco (Cabo Verde)
%D 2006
%@ 0213-683X
%U https://hdl.handle.net/20.500.14352/50435
%X The first data about the composition of lava flows from Branco Island (Cabo Verde) are presented in thiswork. 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 aremugearites (olivine absent, En41-31 clinopyroxene, An51-26 plagioclase, and kaersutite). The compositionalvariations between both the types are explained by crystal fractionation and extraction of pyroxene (up to29%) and lesser proportions of olivine and Fe and Ti oxides (Cpx: 75; Ol: 21; OxFeTi: 4). The transition tomugearites from the most evolved basalts would mainly be due to extraction of pyroxene (24%) and Feand Ti oxides (Cpx: 68; Ol: 3; Plag: 5; OxFeTi: 30).
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