Contributions to the chronology of the Basal Complex of Fuerteventura, Canary Islands

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doi: 10.1016/S0377-0273(99)00008-6
Authors:Balogh, K.; Ahijado, A.; Casillas, R.; Fernández, C.
Author Affiliations:Primary:
Hungarian Academy of Sciences, Institute of Nuclear Research, Debrecen, Hungary
Other:
Universidad de La Laguna, Spain
Universidad de Huelva, Spain
Volume Title:Journal of Volcanology and Geothermal Research
Source:Journal of Volcanology and Geothermal Research, 90(1-2), p.81-101. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-0273
Publication Date:1999
Note:In English. 67 refs.; illus., incl. 8 tables, geol. sketch map
Summary:K-Ar and Ar-Ar analyses of the Basal Complex of Fuerteventura confirm the early start of magmatism in the Late Cretaceous. Plateau ages of 63.1±0.8 Ma and 64.2±1.0 Ma have been obtained for the oldest syenite intrusions indicating the minimum age of these plutonics. The emplacement of carbonatites and syenites along ductile shear zones took place during a relatively short period of time between 23.2±1.0 and 22.1±0.9 Ma. This episode is synchronous all over the island. Younger plutons were intruded around 21.1±0.8 Ma ago and 20.7±0.9 Ma and are probably related to the building of Miocene subaerial edifices. Almost all the minerals and rocks of the Basal Complex show a clear effect of excess argon. Some was acquired during the hydrothermal stage but also some excess argon was trapped during the early crystallization stage of the magma. Moreover, only a part of the radiogenic Ar which had accumulated in pre-Miocene rocks was released during the Miocene magmatism. Abstract Copyright (1999) Elsevier, B.V.
Sections:Age determination
Subjects:Absolute age; Age; Ar/Ar; Carbonatites; Cretaceous; Crystallization; Dates; Geochemistry; Igneous rocks; Intrusions; K/Ar; Magmas; Mesozoic; Plutonic rocks; Plutons; Syenites; Upper Cretaceous; Volcanism; Volcanoes; Atlantic Ocean Islands; Canary Islands; Fuerteventura; Basal Complex
Coordinates:N282500 N282500 W0140000 W0140000
Abstract Numbers:00M/25
Record ID:1999045766
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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