Iron oxide copper-gold (IOCG) mineralization at the Imiter inlier,Eastern Anti-Atlas,Morocco |
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| Authors: | Bouchra Baidada Abdelkhalek Alansari Basem Zoheir Said Ilmen Abderrahmane Soulaimani Moha Ikenne |
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| Institution: | 1. Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, P.O. Box 2390, 40 000, Marrakech, Morocco;2. Department of Geology, Faculty of Science, Benha University, 13518, Benha, Egypt;3. Institute of Geosciences, Kiel University, Ludewig-Meyn Str. 10, 24118, Kiel, Germany;4. Managem Group, Twin Center, 20 100, Casablanca, Morocco;5. LAGAGE Laboratory, Department of Geology, Faculty of Sciences, Ibn Zohr University, P.O. Box 28/S, 80 000, Agadir, Morocco |
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| Abstract: | The Imiter inlier at the eastern Anti-Atlas chain (Morocco) hosts a world-class epithermal Ag-Hg deposit, and several occurrences of sulfide-magnetite mineralization. These occurrences are confined to transcurrent faults that cut mildly to highly potassic I- and S-type granite intrusions (e.g., Igoudrane, Bou Teglimt, Taouzzakt and Bou Fliou).In this contribution, we present new field, petrographic and microanalytical data of the Bou Fliou sulfide-magnetite mineralization in the northwestern part of the Bou Teglimt granodiorite intrusion (567?±?6Ma). Field and microscopic investigations reveal pervasive silicification and potassic alteration associated with iron oxides-rich (>10?vol %) veins, stockworks, and breccias along NE-SW faults. The ore minerals are mainly magnetite, hematite, chalcopyrite, pyrite, sphalerite, Ag-galena, cobaltite, and less abundant Bi-sulfosalts (i.e., cosalite, galenobistmuthite, and llilanite-gustavite). The low-titanium iron oxides (magnetite and hematite), widespread iron-rich breccia, association with crustal scale fault zone, pervasive alteration, and overprinting mineral assemblages suggest a shallow level IOCG-style mineralization. High-order splays of the major fault zone could have provided effective traps for magmatic and basinal Cu and Zn-Pb hydrothermal fluids. The ～550 Ma intrusive phases in the region could have contributed by fluid, elements or heat in a local effective blumbing. The mineralogical and ore textural criteria reflecting ore formation at a realtively shallow crustal environment, but a fluid inclusion study is needed to characterize the ore fluids and mechanism of ore deposition. |
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| Keywords: | Bou Fliou IOCG deposit Magnetite-hematite Granodiorite Geochemistry Imiter inlier Anti-Atlas Morocco |
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