Multiphase origin of the Cu–Co ore deposits in the western part of the Lufilian fold-and-thrust belt, Katanga (Democratic Republic of Congo)

Dewaele, Stijn; Muchez, Philippe; Vets, J.G.; Fernandez-Alonzo, Max; Tack, L.

doi:10.1016/j.jafrearsci.2006.08.002

Cited by 105 publications

(69 citation statements)

References 30 publications

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“…Chalcopyrite, bornite and chalcocite can also occur as direct precipitates or replacement of anhydrite in nodules and lenses (Muchez et al, 2008). The absence of pyrite and chalcopyrite in the orebodies observed at Kamoto by Dewaele et al (2006) can be explained by the continuous supply of copper by an oxidizing (Fe-poor) fluid. The high-grade mineralization of the dolomitic shale at the contact with footwall, with a sharp cutoff at the contact and an exponential decrease upwards has been described by Annels (1989).…”

Section: Discussionmentioning

confidence: 99%

“…These dolomites show a bright orange cathodoluminescence. Locally pyrite and chalcopyrite were recrystallized during this dolomitization (Dewaele et al, 2006). The samples investigated by Dewaele et al (2006) from the Lower and Upper Orebody at Kamoto were largely devoid of pyrite and chalcopyrite which occur only above the Upper Orebody.…”

Section: Geological and Geochemical Constraints On Copper Mineralizationmentioning

confidence: 96%

“…Locally pyrite and chalcopyrite were recrystallized during this dolomitization (Dewaele et al, 2006). The samples investigated by Dewaele et al (2006) from the Lower and Upper Orebody at Kamoto were largely devoid of pyrite and chalcopyrite which occur only above the Upper Orebody. The absence of chalcopyrite in the main orebodies has been explained due to the large amount of available copper (and less iron) resulting in the formation of bornite and chalcocite rather than chalcopyrite.…”

Section: Geological and Geochemical Constraints On Copper Mineralizationmentioning

confidence: 96%

“…In evaporitic sediments of the lower Roan Group early diagenetic dolomite was precipitated prior to copper sulfide formation (Cailteux et al, 2005). This dolomite is nonhttp://dx.doi.org/10.20341/gb.2016.005 luminescent under cathodoluminescence petrography (Dewaele et al, 2006). Authigenic quartz is intergrown with the sulfides and precipitated in rocks of the Lower and Upper Orebody and in the low-grade intermediate zone (Oosterbosch & Schuiling, 1951;Bartholomé et al, 1972;Cailteux, 1994).…”

Section: Geological and Geochemical Constraints On Copper Mineralizationmentioning

confidence: 99%

“…A multiphase origin has been proposed by many authors during the last decade (Cailteux et al, 2005, Selley et al, 2005Dewaele et al, 2006;El Desouky et al, 2010), and is characterized by several hypogene phases, ranging from early diagenetic up to syn-orogenic, followed by an important supergene phase .…”

Section: Introduction and Geological Settingmentioning

confidence: 99%

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Reactive transport modelling of ore mineral zoning and the paragenesis of copper sulfides in sediment-hosted stratiform ore deposits, the Katanga Copperbelt (DRC)

Muchez

Corbella²

2016

Geol. Belg.

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ABSTRACT. Reactive transport modelling was carried out to simulate the transport and precipitation conditions of copper sulfide minerals in the sediment-hosted ore deposits of the Central African Copperbelt. The results illustrate the advancement of a mineral front due to the reaction of copper-rich fluids with host rocks. Chalcopyrite (CuFeS 2 ) initially precipitates in the reducing host rock and pyrite (FeS 2 ) dissolves, but the latter re-precipitates as a halo beyond the chalcopyrite. Continuous supply of copper causes the formation of the copper-rich sulfide bornite (Cu 5 FeS 4 ) followed by chalcocite (Cu 2 S) with precipitation of chalcopyrite and pyrite further down the flow direction. Anhydrite disappears where both copper sulfides and pyrite are precipitated. The modelled sulfide paragenesis and the general distribution of these minerals correspond to patterns observed in rocks within the Katanga Copperbelt.

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Section: Discussionmentioning

confidence: 99%

Section: Geological and Geochemical Constraints On Copper Mineralizationmentioning

confidence: 96%

Section: Geological and Geochemical Constraints On Copper Mineralizationmentioning

confidence: 96%

Section: Geological and Geochemical Constraints On Copper Mineralizationmentioning

confidence: 99%

Section: Introduction and Geological Settingmentioning

confidence: 99%

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Reactive transport modelling of ore mineral zoning and the paragenesis of copper sulfides in sediment-hosted stratiform ore deposits, the Katanga Copperbelt (DRC)

Muchez

Corbella²

2016

Geol. Belg.

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Determination of the Validity of a Collectional Malachite Deposit by an X-ray Fluorescent Analysis

Popov

Nikolaev

Kuptsova

et al. 2023

Springer Proceedings in Earth and Environmental Sciences

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Anhydrite pseudomorphs and the origin of stratiform Cu–Co ores in the Katangan Copperbelt (Democratic Republic of Congo)

et al. 2008

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The stratiform Cu-Co ore mineralisation in the Katangan Copperbelt consists of dispersed sulphides and sulphides in nodules and lenses, which are often pseudomorphs after evaporites. Two types of pseudomorphs can be distinguished in the nodules and lenses. In type 1 examples, dolomite precipitated first and was subsequently replaced by Cu-Co sulphides and authigenic quartz, whereas in type 2 examples, authigenic quartz and Cu-Co sulphides precipitated prior to dolomite and are coarsegrained. The sulphur isotopic composition of the coppercobalt sulphides in the type 1 pseudomorphs is between −10.3 and 3.1‰ relative to the Vienna Canyon Diablo Troilite, indicating that the sulphide component was derived from bacterial sulphate reduction (BSR). The generation of HCO À 3 during this process caused the precipitation and replacement of anhydrite by dolomite. A second product of BSR is the generation of H 2 S, resulting in the precipitation of Cu-Co sulphides from the mineralising fluids. Initial sulphide precipitation occurred along the rim of the pseudomorphs and continued towards the core. Precipitation of authigenic quartz was most likely induced by a pH decrease during sulphide precipitation. Fluid inclusion data from quartz indicate the presence of a high-salinity (8-18 eq. wt.% NaCl) fluid, possibly derived from evaporated seawater which migrated through the deep subsurface. 87 Sr/ 86 Sr ratios of dolomite in type 1 nodules range between 0.71012 and 0.73576, significantly more radiogenic than the strontium isotopic composition of Neoproterozoic marine carbonates (87 Sr/ 86 Sr=0.7056-0.7087). This suggests intense interaction with siliciclastic sedimentary rocks and/or the granitic basement. The low carbon isotopic composition of the dolomite in the pseudomorphs (−7.02 and −9.93‰ relative to the Vienna Pee Dee Belemnite, V-PDB) compared to the host rock dolomite (−4.90 and +1.31‰ V-PDB) resulted from the oxidation of organic matter during BSR.

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Multiphase origin of the Cu–Co ore deposits in the western part of the Lufilian fold-and-thrust belt, Katanga (Democratic Republic of Congo)

Cited by 105 publications

References 30 publications

Reactive transport modelling of ore mineral zoning and the paragenesis of copper sulfides in sediment-hosted stratiform ore deposits, the Katanga Copperbelt (DRC)

Reactive transport modelling of ore mineral zoning and the paragenesis of copper sulfides in sediment-hosted stratiform ore deposits, the Katanga Copperbelt (DRC)

Determination of the Validity of a Collectional Malachite Deposit by an X-ray Fluorescent Analysis

Anhydrite pseudomorphs and the origin of stratiform Cu–Co ores in the Katangan Copperbelt (Democratic Republic of Congo)

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