A late Triassic 40Ar/39Ar age for the El Hammam high-REE fluorite deposit (Morocco): mineralization related to the Central Atlantic Magmatic Province? - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Mineralium Deposita Année : 2010

A late Triassic 40Ar/39Ar age for the El Hammam high-REE fluorite deposit (Morocco): mineralization related to the Central Atlantic Magmatic Province?

Fouad Filali
  • Fonction : Auteur
Douglas A. Archibald
  • Fonction : Auteur
Massimo Nespolo

Résumé

El Hammam is the only fluorite mine in Morocco (production 100,000 t/year). The fluorite mineralization is in an array of fluorite-calcite veins and is characterized by unusually high REE content in carbonate minerals (1,400 ppm in calcite; up to 2,000 ppm in siderite) and in fluorite (about 600 ppm). Since the 1960s, the genesis of the deposit has been attributed to a mesothermal hydrothermal event connected with late-Variscan granitic intrusions. Precise 40Ar/39Ar dating of hydrothermal K-feldspar yields an age of formation of the El Hammam deposit at 205±1 Ma. Its genesis is therefore associated in time and space with the development of the Triassic-Jurassic basins and the associated anorogenic continental flood basalts of the Moroccan Mesetian Middle Atlas. The source of the hydrothermal mineralization (magmatic and/or metamorphic) is discussed.
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Dates et versions

halsde-00467776 , version 1 (29-03-2010)

Identifiants

  • HAL Id : halsde-00467776 , version 1

Citer

Alain Cheilletz, Dominique Gasquet, Fouad Filali, Douglas A. Archibald, Massimo Nespolo. A late Triassic 40Ar/39Ar age for the El Hammam high-REE fluorite deposit (Morocco): mineralization related to the Central Atlantic Magmatic Province?. Mineralium Deposita, 2010, 45, pp. 323-329. ⟨halsde-00467776⟩
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