2026-06-29T09:34:08Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/579362023-08-25T10:23:51Zcom_20.500.14352_14col_20.500.14352_15

Preliminary apatite-fission track geochronology of the Montaña Blanca-Milocho, alkaline pluton, (NW Fuerteventura, Canary Islands, Spain) Ignacio San José, Cristina de Muñoz García, Mercedes Sagredo Ruiz, Juana Barbero González, Luis C. 552 Alkaline clinopyroxenites Basal complex Fuerteventura Petrología The mafic-ultramafic, alkaline Montana Blanca-Milocho pluton, which is part o f the northernmost outcrop of the Basal Complex of the island of Fuerteventura, Canary Islands, is spatially associated to the Jablitos alkaline-carbonatitic complex. Alkaline clinopyroxenites occurring in the periphery o f both intrusive bodies bear strong petrographic, mineralogical and geochemical similarities. However, the study o f a possible genetic relationship between them was so far hindered by the complete absence of geoclironological data. High apatite abundances in these rocks has allowed the application o f the fission track techniques as a geoclironological tool. Nevertheless, in samples were perovskite occurs the lack o f U in apatite, the K-Ar method had to be used. The 25 and 29 Ma fission tracks central ages obtained are well in agreement with theexpected emplacement age o f these shallow intrusive rocks, and also with published and new K-Ar ages. Thus, a genetic relationship between these ultramafic alkaline clinopyroxenites is here proposed. Dirección General de Investigación Científica y Técnica Depto. de Mineralogía y Petrología Fac. de Ciencias Geológicas TRUE pub 2023-06-20T17:12:14Z 2023-06-20T17:12:14Z 2002 journal article https://hdl.handle.net/20.500.14352/57936 1576-5172 spa PB-98-0854 1FD97-0732 open access application/pdf Sociedad Geológica de España.