%0 Journal Article
%T Petrology and Geochemistry of lavas from Sal Island: Implications for the variability of the Cape Verde magmatism
%A Torres
%A P.
%A Silva
%A L. C.
%A Munh¨¢
%A J.
%A Caldeira
%A R.
%A Mata
%A J.
%A Tassinari
%A C.
%J Comunica£¿£¿es Geol¨®gicas
%D 2010
%I Scientific Electronic Library Online
%X sal island (cape verde archipelago) preserves a magmatic history ranging from ¡Ö 25.6 ma to ¡Ö 0.6 ma. the chemistry of magmatism varies from hy-normative (serra negra basalts: ¡Ö 5 ma) to highly sio2 undersaturated (nephelinites and melilitites). the calculated temperatures of magmatic segregation are higher than those usually considered for the asthenosphere, thus endorsing the role of a mantle plume to the origin of cape verde magmatism. nephelinites and melilitites are characterized by pronounced k negative anomalies which are interpreted as reflecting the interaction of plume magmas with the lithosphere. some of the sal lavas are characterized by low 143nd/144nd (down to 0.512577) - when compared with the himu component. these values are similar to those usually reported for the southern cape verde islands. this suggest the role of a em1-type end-member to the magma sources of the sal, which is for the first time evidenced from the whole rock composition of one of the northern cape verde islands.
%K cape verde archipelago
%K mantle plume
%K em1
%K himu
%K sal island.
%U http://www.scielo.gpeari.mctes.pt/scielo.php?script=sci_abstract&pid=S1647-581X2010000100003&lng=en&nrm=iso&tlng=en