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Preliminary apatite-fission track geochronology of the Montaña Blanca-Milocho, alkaline pluton, (NW Fuerteventura, Canary Islands, Spain)

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Ignacio San José, Cristina de and Muñoz García, Mercedes and Sagredo Ruiz, Juana and Barbero González, Luis C. (2002) Preliminary apatite-fission track geochronology of the Montaña Blanca-Milocho, alkaline pluton, (NW Fuerteventura, Canary Islands, Spain). Geotemas, 4 . p. 55. ISSN 1576-5172

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Abstract

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.


Item Type:Article
Uncontrolled Keywords:Alkaline clinopyroxenites, Basal complex, Fuerteventura
Subjects:Sciences > Geology > Petrology
ID Code:61121
Deposited On:25 Jun 2020 12:22
Last Modified:25 Jun 2020 12:23

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