Le manganese dans la Haute-Moulouya (Maroc); contribution a l'etude du groupe des mineralisations liees aux formations volcaniques

Pouit, G.

doi:10.2113/gssgfbull.s7-vi.5.658

Cited by 2 publications

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“…Cambrian dolostones,~3 km south of Tasdremt, host Mn-Fe veins (Mn carbonates and pyrite) capped by gossans (coronadite and goethite), which indicates pre-Cretaceous Mn mineralization in the area (Bouladon and Meune 1951). These veins are also well-known in the Neoproterozoic volcanic rocks of the Anti-Atlas (Bouladon et al 1955;Pouit and Jouravsky 1962;Jouravsky 1963;Jouravsky and Pouit 1963;Choubert and Faure-Muret 1973;Pouit 1980;Lippolt and Hautmann 1995). The Cretaceous sedimentation is a transgressive succession of (1) a 0-30 m thick detrital series ( Bouladon and Meune 1951;Ambroggi 1963) the Lower Cambrian dolostones, which are interbedded with red clay levels (Figs.…”

Section: Geological Settingmentioning

confidence: 83%

“…Paleoproterozoic Mn sources, such as those in other African deposits (Beukes et al 2016), are unlikely given their scarcity in the Tasdremt area bedrocks. However, voluminous volcanic rocks (rhyolite and andesite) hosting numerous Mn-Ba and base-metal deposits occur in the Neoproterozoic basement (Bouladon 1948;Westerveld 1951;Bouladon andJouravsky 1952, 1953;Bouladon et al 1955;Jouravsky 1958Jouravsky , 1963Pouit and Jouravsky 1960, 1961, 1962Jouravsky and Pouit 1963;Pouit 1964Pouit , 1966Pouit , 1976Pouit , 1980Gaudefroy et al 1965;Sebbag 1969;Choubert and Faure-Muret 1973;Lippolt and Hautmann 1995;. They could therefore have enabled the Tasdremt metal association (Mn, Ba and Pb).…”

Section: Metal(s) Source(s)mentioning

confidence: 99%

“…Manganese deposits are widespread in Morocco, especially in the Moroccan Atlas and Anti-Atlas. The most important ones are located in the districts of Bou Arfa (Pouit 1980;Lafforgue et al 2015;Lafforgue 2016), Ouarzazate (Bouladon et al 1955;Jouravsky 1963;Jouravsky and Pouit 1963;Choubert and Faure-Muret 1973;Pouit 1980;Lippolt and Hautmann 1995), and Imini (Fig. 1a;Thein 1990;Lalaoui et al 1991;Gutzmer et al 2006;Dekoninck et al 2016aDekoninck et al , 2016b.…”

Section: Introductionmentioning

confidence: 99%

“…The upper C3 Mn orebody of the Imini deposits contains similar Pb concentrations due to Pb-rich hollandite and coronadite (Gutzmer et al 2006;Dekoninck et al 2016aDekoninck et al , 2016b. Therefore, the Tasdremt manganese deposit could be considered as a potential equivalent of the high-grade Imini ores (Bouladon and Meune 1951;Pouit 1980; Office National des Mines et des Hydrocarbures 2016). These deposits are separated by the Siroua Miocene volcanic complex, over which Mn occurrences are identified in Cretaceous rocks (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Multistage genesis of the late Cretaceous manganese karst-hosted Tasdremt deposit (High Atlas, Morocco)

et al. 2020

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The eastern part of the Souss Basin (Morocco) contains several Mn deposits in the Tasdremt district. Three Mn orebodies occur within the Cenomanian-Turonian dolostones and the Senonian (Coniacian to Maastrichtian) detrital series, the main orebody being located at the boundary between them. The Mn ores consist of coronadite group minerals, mostly coronadite and hollandite, in a karstified dolostone. New field observations, petrographic analyses, and geochemical data define the Tasdremt deposits as a karst-hosted accumulation (11-60 wt.% Mn), particularly enriched in Ba (1.5-8.2 wt.%) and Pb (1.0-5.0 wt.%) with poor contaminations in Al, Fe, and P. This study shows that the ore-forming process is similar to that occurring in the Imini C3 level, located~100 km to the northeast. Such similarities with the high-grade pyrolusite-bearing ore suggest that the Tasdremt deposit is a lateral equivalent of the Imini deposits. However, the scarcity of pyrolusite in Tasdremt results in lower Mn grades, the Tasdremt ores being considered an aborted/ incomplete system in comparison with the Imini deposits. 40 Ar/ 39 Ar geochronology of K-bearing Mn oxides yields late Cretaceous ages, defining three phases at~91.5 Ma,~77.5-82 Ma, and~65-67 Ma. Although the source of metals remains hypothetical, mineralizing fluids were carried by O 2-free groundwater that mixed with O 2-rich shallow meteoric waters at the Tasdremt depositional site. The dissolution of the host dolostones and the karst environment have provided suitable conditions for the precipitation of Mn oxides, causing the coeval increase of pH and Eh, respectively. The Early Atlasic deformation during the Late Cretaceous is associated with mineralization events and was responsible for creation of low stand reliefs from Tasdremt to Imini. This period enabled karstification and mineralization. Connecting the Tasdremt deposits to other African Mn deposits is difficult since the latter consist of laterite resting above Paleoproterozoic Mn protores, and consequently formed under different conditions from karst-hosted deposits. It is likely that other Mn occurrences formed along the Atlas belt in similar settings.

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Section: Geological Settingmentioning

confidence: 83%

Section: Metal(s) Source(s)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multistage genesis of the late Cretaceous manganese karst-hosted Tasdremt deposit (High Atlas, Morocco)

et al. 2020

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“…The spatial distribution of these mineralizations follows a NE-SW axis from the south of Kerdous to the vicinity of Siroua. This distribution does not seem to be solely related to the tectonic factor but also, and especially, to the distribution of the basic series that contains most of these mineralizations [6].…”

Section: Typology and Models Of Mineralization Depositionmentioning

confidence: 82%

Lithostructural analysis and implications for mineralization and paleogeography of the basic series formations of the Ait Abdellah buttonhole, Western Anti-Atlas

2023

Proceeding Book of 2nd International Conference on Frontiers in Academic Research ICFAR 2023

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Located in the Western Anti-Atlas, the Aït Abdallah buttonhole is a noteworthy Hercynian submeridian uplift with significant geological importance. It plays a key role in the regional geology by uplifting the Proterozoic basement beneath a detrital cover of fini-Precambrian and Adoudounian carbonate rocks. The basic series, which constitutes a fundamental component of this study, marks the onset of the Adoudounian transgression that extends from northwest to southeast, covering a large portion of the Western Anti-Atlas. Resting unconformably upon the basement, this series is characterized by a distinctive marker bed. The successive layers of the basic series primarily consist of alternating siltites and sandstone. These formations play a crucial role in hosting the majority of the copper mineralizations found in the Western Anti-Atlas. Therefore, the objective of this study is to determine the paleogeography of these formations and understand the associated type of mineralization. This will be achieved through a comprehensive lithostructural approach, which will involve the analysis of different layers within the basic series, their lithological characteristics, and structural organization. By combining lithostructural data with paleogeographic information, this study will contribute to a better understanding of the geological processes that have shaped the Aït Abdallah buttonhole and its surroundings. Furthermore, it will provide valuable insights into favorable conditions for the formation of copper deposits in this region of the Western Anti-Atlas. These findings will advance regional geological knowledge and may have significant implications for mineral exploration in the study area.

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Le manganese dans la Haute-Moulouya (Maroc); contribution a l'etude du groupe des mineralisations liees aux formations volcaniques

Cited by 2 publications

References 0 publications

Multistage genesis of the late Cretaceous manganese karst-hosted Tasdremt deposit (High Atlas, Morocco)

Multistage genesis of the late Cretaceous manganese karst-hosted Tasdremt deposit (High Atlas, Morocco)

Lithostructural analysis and implications for mineralization and paleogeography of the basic series formations of the Ait Abdellah buttonhole, Western Anti-Atlas

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