Diagenetic origin of the stratiform Cu–Co deposit at Kamoto in the Central African Copperbelt

'Unraveling the origin of the Andean IOCG clan : a Re-Os isotope approach.', Ore geology reviews., 81 (Part 1). pp. 62-78. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T Chilean IOCGs is the result of different events with metals derived from diverse sources i.e., the magmatic-hydrothermal system and basement/host rocks. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTRhenium and Os concentrations for the various studied deposits vary over a wide range of values at the ppb and ppt level, respectively, with many sulfides and magnetite bearing appreciable no common Os. The Re and Os contents in sulfides (pyrite, IOCGs in China and Australia argue for the involvement of a much more radiogenic crustal source possibly related to non-magmatic oxidized saline brines that leached basement rocks. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTWe conclude that Andean IOCG (and IOA) deposits in northern Chile were formed mainly by magmatic-hydrothermal processes related to the formation and emplacement of plutonic rocks with moderate contribution from leaching of basement and/or volcanic host rocks. Surface or basin-derived brines as well as sediments appear to play only a minor role in the formation of the Chilean IOCG clan.

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“…These concentrations are consistent with those reported for the Kamoto (Muchez et al, 2015), and the Kipushi deposit (Schneider et al, 2007) …”

Section: Accepted M Manuscriptsupporting

confidence: 92%

Unraveling the origin of the Andean IOCG clan: A Re-Os isotope approach

Barra

Reich

Selby

et al. 2017

Ore Geology Reviews

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“…Selected age constraints on tectono-metamorphic events before, during and after deposition of the Katanga Supergroup with interpretation of the major events. Age data are shown with error of 2σ and compiled from Barra et al, (2004), Barra (2005), Muchez et al, (2015) and Eastern Zambian Copperbelt data in Sillitoe et al, (2017) for Re-Os dating; Decrée et al, (2011) for U-Pb dating; Cosi et al, (1992), Hanson et al, (1993), Key et al, (Key et al, 2001), Barron et al, (2003), John et al, (2004), Master et al, (2005); Rainaud et al, 5 (2005b), Armstrong et al, (2005) and Johnson et al, (2005) for various igneous and tectono-metamorphic events and Frimmel et al, (2011) for the timing of the Petit and Grand Conglomérat. The base of the Nguba and Kundulungu Groups are defined by the base of the Grand Conglomérat and the Petit Conglomérat respectively.…”

Section: Discussionmentioning

confidence: 99%

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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“…These types of fold linkage are mechanically feasible and thought to be a common process during progressive shortening and fold growth (Schmid et al, 2008;Bretis et al, 2011;Grasemann and Schmalholz, 2012). Various forms of fold linkage, the existence of culminations and depressions along fold hinges, and curvature of axial planes in multilayer sequences are all shown to be typical phenomena in single-deformation 3-D fold development, even in plane strains (Muhlhaus et al, 1998;Schmid et al, 2008;Schmalholz and Schmid, 2012;Grasemann and Schmalholz, 2012). Plunge variations, structural saddles and en echelon periclinal geometries (see Fig.…”

Section: Non-cylindricity Interference Patterns and Strain Accommodamentioning

confidence: 98%

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

Solid Earth

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Abstract. A structural analysis has been carried out along the south-east margin of the Chambishi–Nkana Basin in the Central African Copperbelt, hosting the world-class copper and cobalt (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, characterised by non-cylindrical NW–SE-oriented 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 the intensity of parasitic folding and the degree of shale content in the Copperbelt Orebody Member (COM), 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 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 mineralisation and (re-)mobilisation in the Copperbelt.

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Diagenetic origin of the stratiform Cu–Co deposit at Kamoto in the Central African Copperbelt

Cited by 60 publications

References 38 publications

Unraveling the origin of the Andean IOCG clan: A Re-Os isotope approach

Unraveling the origin of the Andean IOCG clan: A Re-Os isotope approach

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

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