The Reoc??n mine in northern Spain's Basque-Cantabrian basin exploited a world-class Mississippi Valley-type Zn-Pb deposit. Its epigenetic mineralization is in Urgonian 116????????1 Ma dolomitized limestones of the Santillana syncline, which was formed by Oligocene and mid Miocene pulses of the Pyrenean orogeny. Paleomagnetic results (22 sites, 274 specimens) in mineralization isolated a stable remanence (ChRM) in pyrrhotite and minor magnetite inclusions in ore specimens, Zn concentrate, and tailings. A fold test shows that the ChRM is substantially post-folding. The mineralization's paleopole lies on the European apparent polar wander path and indicates that the mineralization was formed at 15????????10 Ma. We postulate that brines originated in underlying Triassic and Lower Cretaceous sedimentary rocks and were driven upward into the host rocks by the hydraulic gradient created by the nearby Asturian massif. ?? 2009 Springer-Verlag.
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The Reoc??n zinc-lead deposit, Spain: Paleomagnetic dating of a late Tertiary ore body