Mining of Mineral Deposits

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The Oumjrane-Boukerzia Mining District (Eastern Anti-Atlas, Morocco): Constraints of its geological and tectono-magmatic setting

Abdel-Ali Kharis1, Said Ilmen1, Mohamed Aissa2, Lahssen Baidder3, Azizi Moussaid2, Hafid Mezougane4, Bouchra Baidada5, Nouamane El Ouad6, Youssef Atif6,7, Hicham Houane7, Lhou Maacha7

1Polydiscipnary Faculty of Ouarzzazte, Ibn Zohr University, Ouarzazate, Morocco

2Moulay Ismail University, Meknes, Morocco

3Hassan II University, Casablanca, Morocco

4Hassan First University, Settat, Morocco

5Moulay Slimane University, Fkih Bensalah, Morocco

6Cadi Ayyad University, Marrakech, Morocco

7Managem Group, Casablanca, Morocco

Min. miner. depos. 2023, 17(1):138-149

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      Purpose. The purpose of the present research is to provide a new lithological, structural and magmatic features of the Oumjrane-Boukerzia Mining District. The results obtained are used to guide exploration works for identifying the new Cu, Ni, Pb, Zn depositions and Ba-bearing mineralization within the whole Oumjrane-Boukerzia domain.

      Methods. This research is based on detailed mapping, structural surveys and geochemical studies performed on the magmatic rocks in the studied area.

      Findings. Structural and microstructural analyses of the studied area have revealed three complex polyphase tectonic events related to the Variscan orogeny: (i) an extensive phase during the Devonian period; (ii) a NW-SE compressional phase of Namuro-Westphalian age; (iii) a NE-SW compressional phase of Stephanian-Autunian age, and (iv) an extensive late phase probably related to the opening of the Central Atlantic ocean during the Late Trias-Jurassic periods. The sedimentary rocks of the district are locally intruded by small undated gabbroic intrusions. Geochemically, these gabbroic bodies are described as olivine-rich gabbros with a continental tholeiitic affinity and suggested to be related to the Central Atlantic magmatic province (CAMP) during the Pangea break-up.

      Originality. The present study describes the host-rocks and structural events responsible for Cu, Ni, Zn, Pb deposition and Ba-bearing mineralization in the Oumjrane-Boukerzia Mining District (Eastern Anti-Atlas, Morocco).

      Practical implications. The geological studies, especially lithostratigraphic, tectonic and magmatism are essential in the mineral exploration. They help exploration geologists identify and define metallotects to discover new minerals.

      Keywords: Anti-Atlas, Oumjrane-Boukerzia, Mining District, Devonian extension, Variscan compression, Central Atlantic magmatic province


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