RT Journal Article
T1 Composición y evolución de las lavas de la isla de Branco (Cabo Verde)
T1 Composition and evolution of Branco Island (Cape Verde)
A1 Brändle, José Luis
A1 Hernán, Francisco
A1 Huertas, María José
A1 Ancochea, Eumenio
AB 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)
YR 2006
FD 2006
LK http://hdl.handle.net/10272/8561
UL http://hdl.handle.net/10272/8561
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 2 jun 2026