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Published in:
2005 | OriginalPaper | Chapter
Volcanic sequences, lithostratigraphy and geochemistry of altered rocks at the Jbel Malek deposit: Clues for the origins of a Neoproterozoic gold deposit, High-Atlas, Morocco
Authors : Ewan Pelleter, Alain Cheilletz, Abdellah Mouttaqi, Abdelkhalek El Hakour, Gasquet Dominique
Published in: Mineral Deposit Research: Meeting the Global Challenge
Publisher: Springer Berlin Heidelberg
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The Jbel Malek gold deposits are situated in the Tamlalt-Menhouhou Palaeozoic-Neoproterozoic inlier, at the eastern edge of the High Atlas belt of Morocco. The inlier is composed of a bimodal volcano-sedimentary sequence intruded by a microgranodiorite stock. The entire rock sequence was severely deformed by the Variscan tectono-thermal events. Native gold is associated with goethite and barite, and seems to have been remobilised. The mineralised area shows intensive alteration halos comprising predominantly albitisation and silicification, then chlorisisation, hematisation, carbonatation, sericitisation and tourmalinisation. Banded iron formations (BIF) indicate the presence of an exhalative mineralization, and hydrothermal activity.