Paleogeography and geochemistry of the “Cenomano-Turonian” formations in the manganese district of Imini (Morocco) and their relation to ore deposition
Identifieur interne : 001146 ( Main/Exploration ); précédent : 001145; suivant : 001147Paleogeography and geochemistry of the “Cenomano-Turonian” formations in the manganese district of Imini (Morocco) and their relation to ore deposition
Auteurs : Jean Thein [Allemagne]Source :
- Ore Geology Reviews [ 0169-1368 ] ; 1991.
Abstract
Detailed geochemical and microfacies analyses in the carbonate sequence of the Cenomano-Turonian in the Moroccan High Atlas Mountains indicate the possible mode of formation of the high-grade manganese ores in the Imini and Tasdremt district, south of the High Atlas. Regional distribution and stratigraphic setting of manganese and the associated metals suggest that the ores were formed in a zone of mixing between oxidized groundwater of meteoric origin and reducing seawater near the coast. The ore-forming metals were provided by continental weathering solutions and by remobilization processes in anoxic deep ocean basins. Giant stratiform manganese deposits of the Imini-type are formed in periods of high sea-level stand, warm climate and global anoxic conditions in the oceans. Large regional halos of associated minor metals in the surrounding carbonates can be used for the exploration of Imini-type manganese deposits.
Url:
DOI: 10.1016/0169-1368(90)90034-K
Affiliations:
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