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The giant Imiter silver deposit: Neoproterozoic epithermal mineralization in the Anti-Atlas, Morocco |
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| Authors: | Alain Cheilletz Gilles Levresse Dominique Gasquet Moulay Azizi-Samir Rachid Zyadi Douglas A Archibald Edward Farrar |
| Institution: | Centre de Recherches Pétrographiques et Géochimiques, CRPG-CNRS and Ecole Nationale Supérieure de Géologie, BP 20, 54501 Vandoeuvre-les-Nancy cedex, France, REMINEX – groupe ONA, 26 Av. Allal El Fassi, Tissir 36–40, Marrakech, Maroc, Geological Sciences, Queen's University, Kingston K7L 3N6, Ontario, Canada, |
| Abstract: | The world-class Imiter silver deposit, in the Anti-Atlas Mountains of Morocco, is a Neoproterozoic epithermal vein deposit genetically associated with a felsic volcanic event, and formed within a regional extensional tectonic regime. Rhyolitic volcanism related to ore formation has been dated at 550Dž Ma by ion-probe U/Pb on zircons. The economic silver mineralization is superimposed on an older, discrete base-metal assemblage associated with calc-alkaline granodioritic magmatism. The magmatism is dated at 572LJ Ma by ion-probe U/Pb dating on zircons, and by 40Ar/39Ar dating on hydrothermal muscovites. In the Anti-Atlas Mountains, the Precambrian-Cambrian transition appears as an important period for the formation of major, productive precious-metal deposits associated with volcanic events and extensional tectonics. The Imiter silver deposit constitutes a Precambrian analogue to modern epithermal deposits. |
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