A precise late Permian 40Ar/ 39Ar age for Central Iberian camptonitic lamprophyres
Scarrow, J. H. (Universidad de Granada. Departamento de Mineralogía y Petrología)
Bea, Fernando 
(Universidad de Granada. Departamento de Mineralogía y Petrología)
Montero, P. (Universidad de Granada. Departamento de Mineralogía y Petrología)
Molina Palma, José Francisco (Universidad de Granada. Departamento de Mineralogía y Petrología)
Vaughan, A. P. M. (British Antarctic Survey)
| 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 ± 1. 3 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. |
| Rights: |
Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.  |
| Language: |
Anglès |
| Document: |
Article ; recerca ; Versió publicada |
| Subject: |
40Ar/39Ar dating ;
Lamprophyres ;
Variscan ;
Central Iberia ;
Transtension |
| Published in: |
Geologica acta, Vol. 4, Núm. 4 (2006) , p. 451-459, ISSN 1696-5728 |
Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/82414
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000346
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/1888
DOI: 10.1344/105.000000346
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Record created 2012-01-30, last modified 2025-09-25