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Mineralium Deposita

, Volume 37, Issue 8, pp 772–781 | Cite as

The giant Imiter silver deposit: Neoproterozoic epithermal mineralization in the Anti-Atlas, Morocco

  • Alain Cheilletz
  • Gilles Levresse
  • Dominique Gasquet
  • Moulay Azizi-Samir
  • Rachid Zyadi
  • Douglas A. Archibald
  • Edward Farrar
Letter

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 550±3 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 572±5 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.

Epithermal Silver Extensional tectonics Geochronology Neoproterozoic Morocco 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • Alain Cheilletz
    • 1
  • Gilles Levresse
    • 1
  • Dominique Gasquet
    • 1
  • Moulay Azizi-Samir
    • 2
  • Rachid Zyadi
    • 2
  • Douglas A. Archibald
    • 3
  • Edward Farrar
    • 3
  1. 1.Centre de Recherches Pétrographiques et Géochimiques, CRPG-CNRS and Ecole Nationale Supérieure de Géologie, BP 20, 54501 Vandoeuvre-les-Nancy cedex, FranceFrance
  2. 2.REMINEX – groupe ONA, 26 Av. Allal El Fassi, Tissir 36–40, Marrakech, MarocFrance
  3. 3.Geological Sciences, Queen's University, Kingston K7L 3N6, Ontario, CanadaFrance

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