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

Romeo Briones, Ignacio and Lunar, R. and Capote del Villar, Ramón and Quesada Ochoa, Cecilio and Dunning, Gregory R. and Piña García, Rubén and Ortega Menor, Lorena (2006) U–Pb age constraints on Variscan magmatism and Ni–Cu–PGE metallogeny in the Ossa–Morena Zone (SW Iberia). Journal of the Geological Society, 163 . pp. 837-846. ISSN 0016-7649

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Abstract

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.

Item Type:Article
Uncontrolled Keywords:Ossa–Morena Zone; Magmatism; Metallogeny
Subjects:Sciences > Geology > Petrology
Sciences > Geology > Geodynamics
ID Code:13381
Deposited On:10 Oct 2011 11:23
Last Modified:10 Oct 2011 11:23

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