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A revised Aquitanian age for the emplacement of the Ronda peridotites (Betic Cordilleras, southern Spain)

Published online by Cambridge University Press:  09 September 2010

J. J. ESTEBAN ,
J. CUEVAS ,
J. M. TUBÍA ,
S. SERGEEV  and
A. LARIONOV
J. J. ESTEBAN*
Affiliation:
Departamento de Geodinámica, Facultad de Ciencia y Tecnología, Universidad del País Vasco, apartado 644, 48080 Bilbao, Spain
J. CUEVAS
Affiliation:
Departamento de Geodinámica, Facultad de Ciencia y Tecnología, Universidad del País Vasco, apartado 644, 48080 Bilbao, Spain
J. M. TUBÍA
Affiliation:
Departamento de Geodinámica, Facultad de Ciencia y Tecnología, Universidad del País Vasco, apartado 644, 48080 Bilbao, Spain
S. SERGEEV
Affiliation:
Centre of Isotopic Research, VSEGEI, 199106 St Petersburg, Russia
A. LARIONOV
Affiliation:
Centre of Isotopic Research, VSEGEI, 199106 St Petersburg, Russia
*
†Author for correspondence: jj.esteban@ehu.es
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Abstract

The hot emplacement of the Ronda peridotites (Betic Cordilleras) developed a dynamothermal aureole and partial melts that led to the intrusion of granite dykes in the peridotites. Previous geochronological data place rather broad limits for this event between 22 and 19 Ma. Analyses of neocrystalline zircon rims from large zircon populations yield a U–Pb SHRIMP age of 22.3±0.7 Ma for the dynamothermal aureole formation, and intrusion ages of granite dykes between 22.6±1.8 and 21.5±3.8 support that conclusion. Therefore, these new ages provide a more robust constraint on the hot emplacement of the Ronda peridotites at middle crustal levels.

Keywords

Betic CordillerasRonda peridotitesanatexisdykeU–Pb SHRIMP
Type
Rapid Communication
Information
Geological Magazine , Volume 148 , Issue 1 , January 2011 , pp. 183 - 187
Copyright
Copyright © Cambridge University Press 2010

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