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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/32071

Title: A precise late Permian 40Ar/39Ar age for Central Iberian camptonitic lamprophyres
Authors: Scarrow, Jane H.
Bea Barredo, Fernando
González Montero, Pilar
Molina Palma, José Francisco
Vaughan, Alan P. M.
Issue Date: 2006
Abstract: The Avila batholith of central Spain is composed, predominantly, of crustal-melt peraluminous granites cut by small-scale mafic alkaline bodies. Dating of the Gredos sector mafic camptonitic lamprophyre dykes was undertaken to constrain the Late Variscan tectonomagmatic evolution of the region. A well constrained late Permian, Capitanian, age of 264.5 ± 0.9 Ma was obtained by 40Ar/39Ar geochronology using amphibole separates. This new age clearly distinguishes the dykes from other episodes of alkaline mafic magmatism in the region. We suggest that the lamprophyre dykes were emplaced into already solidified granitoids after the tectonic control on magma generation changed from purely extensional to transtensional.
Sponsorship: This work has been supported by the Spanish CICYT project CGL2005-05863.
Publisher: Universidad de Barcelona; Instituto de Ciencias de la Tierra Jaume Almera
Keywords: 40Ar/39Ar dating
Lamprophyres
Variscan
Central Iberia
Transtension
URI: http://hdl.handle.net/10481/32071
ISSN: 1695-6133
1696-5728
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Scarrow, J.H.; et al. A precise late Permian 40Ar/39Ar age for Central Iberian camptonitic lamprophyres. Geologica Acta, 4(4): 451-459 (2006). [http://hdl.handle.net/10481/32071]
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