Hitzman, MW and Broughton, D and Selley, D and Woodhead, J and Wood, D and Bull, S, The Central African Copperbelt: diverse stratigraphic, structural, and temporal settings in the world's largest sedimentary copper district, Society of Economic Geologists Special Publication, 16 pp. 487-514. ISSN 0361-0128 (2012) [Refereed Article]
Copyright 2012 Society of Economic Geologists
Official URL: http://www.segweb.org/
The Copperbelt contains copper deposits in a range of rock units at a number of different stratigraphic levels. These deposits display differing styles and textures of mineralization and alteration types. Deposits may contain either or both disseminated, generally fine-grained sulfides and vein-hosted, generally coarse-grained sulfides. Nevertheless, there are shared characteristics among most deposits. Deposits are hosted at stratigraphic or structural redox boundaries. Where deposits occur in the stratigraphically lowermost reduced rocks, overlying reduced or favorable rocks generally were not mineralized. Although redox was a fundamental control for mineralization, the most carbonaceous rocks within an ore horizon are commonly not economically mineralized. Ore sulfide zonation within deposits occurs on multiple scales, with complexity of zoning broadly related to the complexity of the host-rock sequence. Macrostructural controls on deposit position suggest that extensional faults were important in controlling fluid flow, either directly or indirectly through influence on sedimentary and probably diagenetic facies variation. The stratigraphic section within which the deposits are located was affected by regional potassic, magnesian, silicic, and/or sodic alteration controlled partly by lithology and indicative of the passage of basinal brines.
Mineralization in the Copperbelt appears to have occurred over a protracted period that spanned diagenesis, basin inversion, and metamorphism. This attests to the longevity of ore-forming brines resident within the Katangan basin and at least the upper part of its basement. The near-surface portions of deposits throughout the Central African Copperbelt have undergone oxidation and supergene enrichment and such enrichment has been important in upgrading the copper tenor of many deposits.
|Item Type:||Refereed Article|
|Keywords:||Central African Copperbelt|
|Research Division:||Earth Sciences|
|Research Field:||Ore Deposit Petrology|
|Objective Division:||Mineral Resources (excl. Energy Resources)|
|Objective Group:||Other Mineral Resources (excl. Energy Resources)|
|Objective Field:||Mineral Resources (excl. Energy Resources) not elsewhere classified|
|Author:||Selley, D (Dr David Selley)|
|Author:||Bull, S (Dr Stuart Bull)|
|Deposited By:||Centre for Ore Deposit Research - CODES CoE|
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