Osmium, sulphur, and helium isotopic results from the giant Neoproterozoic epithermal Imiter silver deposit, Morocco: evidence for a mantle source

Levresse, Gilles; Cheilletz, Alain; Gasquet, Dominique; Reisberg, Laurie; Deloule, Étienne; Marty, Bernard; Kyser, Kurt

doi:10.1016/j.chemgeo.2004.02.004

Cited by 68 publications

(71 citation statements)

References 34 publications

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“…These models range from syngenetic (Vargas 1983;Popov et al 1986;Guillou et al 1988;Popov 1995) to epigenetic (Leistel and Qadrouci 1991). From 2000 onward, most workers have advocated epithermal mineralizing processes (Levresse 2001;Cheilletz et al 2002;Levresse et al 2004). However, despite an impressive number of geochemical investigations, the genesis of the Imiter Ag deposit remains uncertain, particularly the origin(s) of the ore-forming fluids, sources of heat and metal components, mechanism(s) of ore deposition, and the age of mineralization.…”

Section: Introductionmentioning

confidence: 97%

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Degassing as the Main Ore-Forming Process at the Giant Imiter Ag–Hg Vein Deposit in the Anti-Atlas Mountains, Morocco

Levresse

Bouabdellah

Cheilletz

et al. 2016

Mineral Deposits of North Africa

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Section: Introductionmentioning

confidence: 97%

“…To explain the origin of such a huge silver concentration, diverse genetic models have been proposed (Leistel and Qadrouci 1991;Baroudi et al 1999; Levresse et al 2004). These models range from syngenetic (Vargas 1983;Popov et al 1986;Guillou et al 1988;Popov 1995) to epigenetic (Leistel and Qadrouci 1991).…”

Section: Introductionmentioning

confidence: 99%

Degassing as the Main Ore-Forming Process at the Giant Imiter Ag–Hg Vein Deposit in the Anti-Atlas Mountains, Morocco

Levresse

Bouabdellah

Cheilletz

et al. 2016

Mineral Deposits of North Africa

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“…The mineralization genesis towards the end of the episode eruptive acid to intermediate formation of Tamerzaga-Timrachine Neoproterozoic terminal. The neutral epithermal type related to the installation of the rhyolitic magmatism at the end of the Neoproterozoic terminal Levresse, (2001Levresse, ( , 2004) is accepted by the majority of the Authors.…”

Section: Resultsmentioning

confidence: 99%

A New Interpretation of Geodynamic Context and Typology of Moroccan Anti-Atlas Silver Deposits

Wafik

Abderahmane

Nouaman

et al. 2017

ESJ

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The argentiferous deposits in the Anti-Atlasic chain in Morocco are encased in the meta-sedimentary, volcanic-sedimentary and volcanic terrains of the Neoproterozoic, structured and schistosed during the Pan-African orogenesis. These deposits are associated with terminal Neoproterozoic rhyolites and granitoids. The deposits of Zgounder, Imiter and Bou Madine have similarities; Structurally are controlled and associated with faults; The source of the mineralization is generally magmatic or crustal. Precipitation of the mineralization would result from the mixing of mineralized fluids with meteoric waters or brine pools. The silver deposits in the Anti-Atlas are characterized by a number of criteria, which confirm their orogenic character. These deposits are associated with orogenic accretion events in relation to Pan-African orogenesis during the Neoproterozoic. Mineralization is syn-to post-peak metamorphism, controlled and associated faults, with veins that can have significant vertical extensions. The pressure gradients, and temperature metamorphism, indicating an orogenic environment, with metamorphic facies greenschist in general. These deposits can all be linked to an argentiferous mega-event during the Upper Neoproterozoic and thus define an argentiferous metallogenic province.

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“…Metallogenic activity was greatest during the final extensional stage, at the Precambrian-Cambrian boundary and is characterized by worldclass precious metal deposits, base-metal porphyry and SEDEX type occurrence (Gasquet et al, 2005). The geochemical characteristics of the Imiter Ag deposit and other metal accumulations in the Anti-Atlas were formed by fluids of essentially mantle origin, accompanied by SO 2 degassing producing sulphides (Levresse et al, 2004;Gasquet et al, 2005). All of these metallic bodies will be highly conducting.…”

Section: Lower Crustmentioning

confidence: 99%

“…The low resistivity structure could be associated to relic subducted oceanic sediments, as is the case for one of the longest conductivity anomalies known on the globe, namely the Trans-Hudson orogen (Jones et al, 2005). On the other hand, the Anti-Atlas was affected at the end of the Pan-African orogeny (ca 585-560 Ma) by high-K calc-alkaline and alkaline magmatism, and also the Proterozoic inliers in the Anti-Atlas are highly mineralized, among them the Imiter deposit which is one of the largest silver deposits in the world (Levresse et al, 2004). The subduction-related calc-alkaline magmatism was associated with large-scale base metal and gold mineralization.…”

Section: Lower Crustmentioning

confidence: 99%

Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco

Ledo

Jones

Siniscalchi

et al. 2011

Physics of the Earth and Planetary Interiors

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a b s t r a c tThe Atlas Mountains in Morocco are considered as type examples of intracontinental mountain chains, with high topography that contrasts with moderate crustal shortening and thickening. Whereas recent geological studies and geodynamic modelling suggest the existence of dynamic topography to explain this apparent contradiction, there is a lack of modern geophysical data at the crustal scale to corroborate this hypothesis. To address this deficiency, magnetotelluric data were recently acquired that image the electrical resistivity distribution of the crust from the Middle Atlas to the Anti-Atlas, crossing the tabular Moulouya plain and the High Atlas. All tectonic units show different, distinct and unique electrical signatures throughout the crust reflecting the tectonic history of development of each one. In the upper crust, electrical resistivity values and geometries can be associated to sediment sequences in the Moulouya and Anti-Atlas and to crustal scale fault systems in the High Atlas developed likely during Cenozoic times. In the lower crust, the low resistivity anomaly found below the Moulouya plain, together with other geophysical (low velocity anomaly, lack of earthquakes and minimum Bouguer anomaly) and geochemical (Neogene-Quaternary intraplate alkaline volcanic fields) evidences, infer the existence of a small degree of partial melt at the base of the crust. Resistivity values suggest a partial melt fraction of the order of 2-8%. The low resistivity anomaly found below the Anti-Atlas may be associated with a relict subduction of Precambrian oceanic sediments, or to precipitated minerals during the release of fluids from the mantle during the accretion of the Anti-Atlas to the West African Supercontinent during the Panafrican orogeny (ca. 685 Ma).

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Osmium, sulphur, and helium isotopic results from the giant Neoproterozoic epithermal Imiter silver deposit, Morocco: evidence for a mantle source

Cited by 68 publications

References 34 publications

Degassing as the Main Ore-Forming Process at the Giant Imiter Ag–Hg Vein Deposit in the Anti-Atlas Mountains, Morocco

Degassing as the Main Ore-Forming Process at the Giant Imiter Ag–Hg Vein Deposit in the Anti-Atlas Mountains, Morocco

A New Interpretation of Geodynamic Context and Typology of Moroccan Anti-Atlas Silver Deposits

Electrical signature of modern and ancient tectonic processes in the crust of the Atlas mountains of Morocco

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