%0 Journal Article
%A Romeo Briones, Ignacio
%A Lunar Hernández, Rosario
%A Capote del Villar, Ramón
%A Quesada Ochoa, Cecilio
%A Dunning, Gregory R.
%A Piña García, Rubén
%A Ortega Menor, Lorena
%T U–Pb age constraints on Variscan magmatism and Ni–Cu–PGE metallogeny in the Ossa–Morena Zone (SW Iberia)
%D 2006
%@ 0016-7649
%U https://hdl.handle.net/20.500.14352/49734
%X New U–Pb zircon ages from the Santa Olalla Igneous Complex have been obtained, which improvethe knowledge of the precise timing of Variscan magmatism in the Ossa–Morena Zone, SW Iberia. Thiscomplex 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 samplesbelonging to the Santa Olalla Igneous Complex and spatially related granites. With the exception of the Calagranite (352 ± 4 Ma), which represents an older intrusion, the bulk of samples yield ages that cluster around340  3 Ma: the Santa Olalla tonalite (341.5 ± 3 Ma), the Sultana hornblende tonalite (341 ± 3 Ma), amingling area at the contact between the Aguablanca and Santa Olalla stocks (341 ± 1.5 Ma), the Garrotegranite (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 groupof sub-volcanic rhyolitic intrusions belonging to the Bodonal–Cala volcano-sedimentary complex, which hoststhe igneous rocks. The knowledge that emplacement of the Aguablanca deposit was related to episodictranstensional tectonic stages during the Variscan orogeny will be fundamental in future mineral exploration inthe Ossa–Morena Zone.
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