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Métallogenèse et évolution géotectonique des amas sulfurés polymétalliques et des gisements d'or associés de la chaine d'Ariab-Arbaat (Red Sea Hills, NE Soudan)

Abstract : Volcanic-hosted massive sulphides (VMS) from the Ariab Mining District (NE Sudan) formed in relation with a submarine volcanic activity within an Upper Proterozoic tholeiitic to calc-alkaline arc setting. Gold is exploited in silica-baritic rocks of supergene origin formed after massive sulphides but also in massive barite lenses and pre-kinematic quartz veins. All formations are affected by accretion tectonics and related shear deformation (D1-2). Gold assemblage (Au, Cu-Te) post-dates ductile deformation and the greenschist facies metamorphism peak. It formed by dilution, associated to a P-T drop, of aqueous-carbonic fluids(300-400°C-200-450MPa) under brittle-ductile shearing conditions (D3) after adakite-like intrusions (G2). It results either from in-situ gold remobilization within early auriferous hydrothermal deposits or from late-orogenic gold introduction.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2006_0142_ABU_FATIMA.pdf
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https://hal.univ-lorraine.fr/tel-01746580
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Submitted on : Thursday, March 29, 2018 - 10:40:37 AM
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Mohamed Abu Fatima. Métallogenèse et évolution géotectonique des amas sulfurés polymétalliques et des gisements d'or associés de la chaine d'Ariab-Arbaat (Red Sea Hills, NE Soudan). Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10142⟩. ⟨tel-01746580⟩

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