A precise late Permian 40Ar/39Ar age for Central Iberian camptonitic lamprohyres

Geologica Acta

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Field Value
 
Title A precise late Permian 40Ar/39Ar age for Central Iberian camptonitic lamprohyres
 
Creator SCARROW, J.H.
BEA, F.
GONZÁLEZ MONTERO, P.
MOLINA PALMA, J. F.
VAUGHAN, ALAN
 
Subject 40Ar/39Ar dating. Lamprophyres. Variscan. Central Iberia. Transtension.
 
Description 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.
 
Publisher Geologica Acta
Geologica Acta
Geologica Acta
 
Contributor
 
Date 2006-01-13
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
 
Identifier http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000346
10.1344/105.000000346
 
Source Geologica Acta; Vol 4, No 4; 451-460
Geologica Acta; Vol 4, No 4; 451-460
Geologica Acta; Vol 4, No 4; 451-460
1696-5728
1695-6133
 
Language eng
 
Relation http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000346/4215
 
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