Journal
MINERALIUM DEPOSITA
Volume 44, Issue 8, Pages 867-880Publisher
SPRINGER
DOI: 10.1007/s00126-009-0253-3
Keywords
Geochronology; Miocene; Mississippi Valley-type ore; Northern Spain; Paleomagnetism; Reocin mine
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada [7834-05]
- Ministerio de Ciencia e Innovacion of Spain [CGL200500798/BTE]
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The Reocin 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.
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