Hernández Pacheco, Alfredo2025-05-272025-05-2719890213-683Xhttps://hdl.handle.net/20.500.14352/120504The Amanay Massif in the island of Fuerteventura is built up by a series of hypoabyssal subvolcanic alkaline rocks (ultramafics, gabbros and syenites) intruded by several basaltic dyke-swarms of regional extension. The ultramafic rocks form a Pyroxenite-Carbonatite Complex surrounded by the corresponding feldespatic net-work and associated fenites. The regional swarms of dykes, whose main structural trends are NNE-SSW, N-60-70º and N-115-120° seems to change gradual/y in the southern areas of the massif to lava sheets that mark the upper levels .of the formation. The last event in the area is represented by a few remanents of a formerly extenser coverture of horizontal lava flows that líe unconformabily over the dyke-swarm formation.spaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/journal article2173-6545https://sociedadgeologica.org/publicaciones/geogaceta/geogaceta-6-1989/open access552Alkaline ultramafic carbonatite complexesDyke swarmsCanary /standsPetrología2506.13 Petrología Ignea y Metamórfica