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Journal of the Geological Society; 2006; v. 163; issue.5; p. 837-846;
DOI: 10.1144/0016-76492005-065
© 2006 Geological Society of London

Original Article

U–Pb age constraints on Variscan magmatism and Ni–Cu–PGE metallogeny in the Ossa–Morena Zone (SW Iberia)

I. Romeo1, R. Lunar2, R. Capote1, C. Quesada3,4, G.R. Dunning5, R. Piña2 & L. Ortega2

1 1Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain (e-mail: iromeobr@geo.ucm.es)
2 2Departamento de Cristalografía y Mineralogía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
3 3Dirección de Geología y Geofísica, IGME, 28003 Madrid, Spain
4 4Departamento de Paleontología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
5 5Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Nfld. A1B 3X5, Canada

New U–Pb zircon ages from the Santa Olalla Igneous Complex have been obtained, which improve the knowledge of the precise timing of Variscan magmatism in the Ossa–Morena Zone, SW Iberia. This complex has a special relevance as it hosts the most important Ni–Cu–platinum group element (PGE) mineralization in Europe: the Aguablanca deposit. U–Pb zircon ages have been obtained for seven samples belonging to the Santa Olalla Igneous Complex and spatially related granites. With the exception of the Cala granite (352 ± 4 Ma), which represents an older intrusion, the bulk of samples yield ages that cluster around 340 ± 3 Ma: the Santa Olalla tonalite (341.5 ± 3 Ma), the Sultana hornblende tonalite (341 ± 3 Ma), a mingling area at the contact between the Aguablanca and Santa Olalla stocks (341 ± 1.5 Ma), the Garrote granite (339 ± 3 Ma), the Teuler granite (338 ± 2 Ma), and dioritic dykes from the Aguablanca stock (338.6 ± 0.8 Ma). The Bodonal–Cala porphyry, which has also been dated (530 ± 3 Ma), comprises a group of sub-volcanic rhyolitic intrusions belonging to the Bodonal–Cala volcano-sedimentary complex, which hosts the igneous rocks. The knowledge that emplacement of the Aguablanca deposit was related to episodic transtensional tectonic stages during the Variscan orogeny will be fundamental in future mineral exploration in the Ossa–Morena Zone.




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I. ROMEO, R. TEJERO, R. CAPOTE, and R. LUNAR
3D gravity modelling of the Aguablanca Stock, tectonic control and emplacement of a Variscan gabbronorite bearing a Ni-Cu-PGE ore, SW Iberia
Geological Magazine, 2008; 145: 345 - 359.
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