Metallogenesis of the Nkana copper–cobalt South Orebody, Zambia

Brems, Dieter; Muchez, Ph.; Sikazwe, O.; Mukumba, W.

doi:10.1016/j.jafrearsci.2009.04.003

Cited by 47 publications

(46 citation statements)

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“…Petrography was performed on polished thin sections, thick doubly polished wafers and polished sections. Petrographic and microstructural observations were carried out 5 on 82 oriented thin sections that were obtained in a 2012 field campaign, in addition to 76 thin sections and and 35 polished sections available from an extensive sample collection of two previous studies at Nkana (Brems et al, 2009;Muchez et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

“…Here, Katanga Supergroup metasediments are surrounded by a variable suite of basement rocks (Bard and Jordaan 1963). A large scale SW verging syncline with a wavelength of c. 6 km is developed on the southeast termination of the Chambishi-Nkana Basin ( Fig.4; Bard and Jordaan 1963;Brems et al, 2009). The study area is situated on the eastern limb of this syncline which closes to the SE in the Nkana 15 South area.…”

Section: The Chambishi-nkana Basin and Nkana Cu-co Depositmentioning

confidence: 96%

“…Minor ore also occurs at the top of the underlying Mindola Clastics Fm and at the base of hangingwall units overlying it. Mineralization occurs as disseminated sulfides in the host rock, in several generations of veins and associated with structures such as hinge zone of tight to isoclinal folds, deformed veins, faults or burial or tectonic foliations (Brems et al, 2009;Torremans et al, 20 2014). Several mineralization/remobilization stages have been identified at Nkana (Brems et al, 2009;Muchez et al, 2010).…”

Section: The Chambishi-nkana Basin and Nkana Cu-co Depositmentioning

confidence: 99%

“…2). Unequivocal evidence for early diagenetic Cu-Co mineralization is lacking, which does not exclude its existence (Brems et al, 2009;Muchez et al, 2010). At Nkana South, several mineralization/remobilization stages have been identified from basin inversion onwards, characterized by different vein generations that formed during compressional deformation (Muchez et al, 2010;Torremans et al, 2014).…”

mentioning

confidence: 99%

“…At Nkana South, several mineralization/remobilization stages have been identified from basin inversion onwards, characterized by different vein generations that formed during compressional deformation (Muchez et al, 2010;Torremans et al, 2014). Geological mapping has indicated that rich orebodies are present in the hinge 5 zones of tight to isoclinal folds, both at Nkana South (Brems et al, 2009) andNkana Central (De Cleyn 2009). Conversely, at Mindola, the ore occurs in beds that are simply dipping to the SW without significant folding (Clara 2009).…”

mentioning

confidence: 99%

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Non-cylindrical parasitic folding and strain partitioning during the Pan-African Lufilian orogeny in the Chambishi-Nkana Basin, Central African Copperbelt

Torremans¹,

Muchez²,

Sintubin³

2018

Preprint

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Abstract.A structural analysis has been carried out along the southeast margin of the Chambishi-Nkana Basin in the Central African Copperbelt, hosting the world-class Cu-Co Nkana orebody. The geometrically complex structural architecture is interpreted to have been generated during a single NE-SW oriented compressional event, clearly linked to the Pan-African Lufilian orogeny. This progressive deformation resulted primarily in asymmetric multiscale parasitic fold assemblages, 5 characterized by non-cylindrical NW-SE elongated, periclinal folds that strongly interfere laterally, leading to fold linkage and bifurcation. The vergence and amplitude of these folds consistently reflect their position along an inclined limb of a NW plunging megascale first-order fold. A clear relation is observed between development of parasitic folds and certain lithofacies assemblages in the Copperbelt Orebody Member, which hosts most of the ore. Differences in fold amplitude, wavelength and shape are explained by changes in mechanical stratigraphy caused by lateral lithofacies variation in ore-bearing horizons. In 10 addition, strong differences in strain partitioning occur within the deforming basin, which is interpreted to be in part controlled by changes in mechanical anisotropy in the layered rock package. This work provides an essential backdrop to understand the influence of the Lufilian orogeny on metal mineralization and (re−)mobilization in the Copperbelt.

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Section: Methodsmentioning

confidence: 99%

Section: The Chambishi-nkana Basin and Nkana Cu-co Depositmentioning

confidence: 96%

Section: The Chambishi-nkana Basin and Nkana Cu-co Depositmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Non-cylindrical parasitic folding and strain partitioning during the Pan-African Lufilian orogeny in the Chambishi-Nkana Basin, Central African Copperbelt

Torremans¹,

Muchez²,

Sintubin³

2018

Preprint

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Cobalt

Roberts¹,

Gunn²

2013

Critical Metals Handbook

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Detrital zircon U–Pb geochronology and provenance of the Neoproterozoic Lower Roan Group, Chambishi Basin, North‐eastern Zambia: Implication for rift evolution of the Congo Craton

et al. 2019

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Zambia Copperbelt hosts numerous world‐class, high‐grade sediment‐hosted stratiform Cu deposits. The Lower Roan Group of the Katanga Supergroup is the main ore host and mainly comprises clastic rocks. In this study, we conducted laser ablation inductively coupled plasma mass spectrometry detrital zircon dating on the sedimentary rocks of the Lower Roan Group in the Chambishi Basin, in order to investigate the Neoproterozoic rift evolution of the Congo Craton. Our results reveal that the main zircon age population (97.1%) falls within 2.1–1.7 Ga (peaks at 1.95 and 1.88 Ga), and minor age populations fall into the Archaean (2.7–2.4 Ga), Palaeoproterozoic (2.3–2.1 Ga), and Mesoproterozoic (1.5–1.05 Ga). Detrital zircons from the Lower Roan Group have distinct oscillatory zoning in cathodoluminescence images, high Th/U ratios (mostly 0.5–2.0), and are sub‐angular, suggesting close detrital provenance. Provenance of the Lower Roan group may have been mainly the Lufubu Metamorphic Complex, Bangweulu Block, and Muva Supergroup, and minor the nearby granitoids of the Irumide Belt. The south‐eastern Congo Craton likely underwent two Neoproterozoic rifting events: the first rift cycle lasted from 880 to 820 Ma when the Lower Roan and Upper Roan groups were deposited in the Roan Basin. After an uplift, the Mwashia, Nguba, and Kundelungu groups of the Katanga Supergroup were likely deposited during the second rift basin development (765–635 Ma). The similar detrital zircon age spectra suggested that the Mwashia Group may have derived from the Lower Roan Group.

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Metallogenesis of the Nkana copper–cobalt South Orebody, Zambia

Cited by 47 publications

References 50 publications

Non-cylindrical parasitic folding and strain partitioning during the Pan-African Lufilian orogeny in the Chambishi-Nkana Basin, Central African Copperbelt

Non-cylindrical parasitic folding and strain partitioning during the Pan-African Lufilian orogeny in the Chambishi-Nkana Basin, Central African Copperbelt

Cobalt

Detrital zircon U–Pb geochronology and provenance of the Neoproterozoic Lower Roan Group, Chambishi Basin, North‐eastern Zambia: Implication for rift evolution of the Congo Craton

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