Impacto
Downloads
Downloads per month over past year
Brandle, J.L. and Hernán, F. and Huertas Coronel, María José and Ancochea Soto, Eumenio (2006) Composición y evolución de las lavas de la isla de Branco (Cabo Verde). Geogaceta (40). pp. 91-94. ISSN 0213-683X
![[thumbnail of 2006_CV_Composicion_Branco_Geogaceta.pdf]](/style/images/fileicons/application_pdf.png) Preview |
PDF
307kB |
Official URL: http://www.sociedadgeologica.es/
Abstract
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).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Oceanic islands, Branco, Barlovento Islands, Cape Verde, Alkaline basalts |
| Subjects: | Sciences > Geology > Petrology |
| ID Code: | 9943 |
| Deposited On: | 04 Feb 2010 09:57 |
| Last Modified: | 06 Feb 2014 08:34 |
Origin of downloads
Repository Staff Only: item control page
