Geologica Belgica

1374-8505 2034-1954

 

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David DEBRUYNE, Lieve BALCAEN, Frank VANHAECKE & Philippe MUCHEZ

Rare earth element and yttrium characteristics of carbonates within the sediment-hosted Luiswishi and Kamoto Cu-Co deposits, Katanga Copperbelt (Democratic Republic of Congo DRC).

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Mots-clés : dolomite, hydrothermal, fluid-rock interaction, remobilization, Eu anomaly, Ce anomaly

Abstract

The Neoproterozoic Central African Copperbelt is a world-class metallogenic province characterized by sediment-hosted stratiform Cu-Co ore deposits and polymetallic vein-type deposits. Two main mineralization phases have been recognized in the Katanga Copperbelt (Democratic Republic of Congo). The first phase occurred during early to intermediate diagenesis and the second during deep burial and the Lufilian orogeny. The Rare Earth Element and Yttrium (REY) concentrations of gangue dolomites associated with the second mineralization phase at the Kamoto and Luiswishi ore deposits were determined and compared to those of their respective host rocks. Kamoto samples exhibit convex Upper Continental Crust-normalized patterns with a pronounced light REE depletion without significant Eu anomalies and with positive La anomalies. The Luiswishi samples exhibit either progressively increasing REY patterns or ramp-shaped patterns with minor mid REE-heavy REE fractionation, accompanied by pronounced negative Ce and Eu anomalies. These differences suggest that a more intense metamorphic overprint at Luiswishi contributed to the differences with the Kamoto deposit.

To cite this article

David DEBRUYNE, Lieve BALCAEN, Frank VANHAECKE & Philippe MUCHEZ, «Rare earth element and yttrium characteristics of carbonates within the sediment-hosted Luiswishi and Kamoto Cu-Co deposits, Katanga Copperbelt (Democratic Republic of Congo DRC).», Geologica Belgica [En ligne], volume 16 (2013), number 1-2, 76-83 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=4013.

About: David DEBRUYNE

Geodynamics and Geofluids Research Group, Department of Earth and Environmental Sciences, K.U. Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium

About: Lieve BALCAEN

Atomic and Mass Spectrometry Research Group, Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, B-9000 Ghent, Belgium

About: Frank VANHAECKE

Atomic and Mass Spectrometry Research Group, Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, B-9000 Ghent, Belgium

About: Philippe MUCHEZ

Geodynamics and Geofluids Research Group, Department of Earth and Environmental Sciences, K.U. Leuven, Celestijnenlaan 200E, B-3001 Leuven, Belgium