Caracterización de los materiales volcánicos asociados a las erupciones holocenas de La Caldera de Pinos de Gáldar y edificios volcánicos adyacentes (Gran Canaria)

Abstract

International audienceThe holocene eruption of La Caldera de Pinos de Ca/dar (2,830 years b.p.) is charaeterized by an strombolian cone, several Java flows of basanite composition and fall pyroclastic deposits. This volcano and other neighbour volcanic cones (Valleseco, Montañón Negro -2.970 years b.p.-, Hondo de Fagagesto - 2.210 years b.p.-, Sao and los Berrazales) are almost contemporaneous and they form a NW-SE structural lineation of 9 km. In addition, the lava flows of these volcanic centres show similar petrographic and chemical data, suggesting the same magmatic reservoir. However, the studied ultrabasic xenoliths, clinopyroxenite cumulates and clinopyroxene megacrysts, associated to the pyroclastic deposits from Caldera de Pinos de Galdar, display different textural, mineralogical and chemical charaeteristics as compared to their host basanitic lava flows, therefore these materials were originated under different upper mantle or conditions different parental magmas