Cassiterite and columbo-tantalite (Coltan) mineralisation in the Proterozoic rocks of the northern part of the Kibara orogen (Central Africa): preliminary results
Authors
Dewaele, S.
Fernandez-Alonso, M.
Tack, L.
Discipline
Earth and related Environmental sciences
Subject
Geodynamics and mineral resources
PROMINES
Audience
Scientific
Date
2008Publisher
Royal Academy for Overseas Sciences
Metadata
Show full item recordDescription
The Central African Kibara orogen extends from the southeastern part of Uganda to the southern part of the Democratic Republic of Congo (DRC). It forms a met- allogenic province that hosts different types of granite-related mineralization: cassiterite, columbite-tantalite, wolframite, gold, monazite, amblygonite, beryl, etc. These minerals are present in different types of mineralization. The minerals occur as primary mineraliza- tion in quartz veins and pegmatites, but also as secondary mineralization in alluvial or elu- vial deposits. In this study, we focus on the metallogeny of the primary tin and columbite- tantalite mineralization in the northern part of the Kibara orogen (Rwanda, Burundi, Uganda, Tanzania, Maniema and Kivu in the DRC). Based on a systematic overview of mining data in the archives of the RMCA, field work, petrography, geochemical, miner- alogical and microthermometric investigations of ore and gangue minerals and based on a comparison with recent ore-forming models of granite-related ore deposits, a preliminary metallogenic model is proposed. The main granite generation G1-3 intruded at 1380 +/- 10 Ma in the Palaeo- and Mesoproterozoic rocks of the Kibara orogen. At ~986 Ma, the youngest G4 granite gener- ation formed. Although historically called tin -granite, this granite generation is not min- eralized. After consolidation of the G4-granite, pegmatites were emplaced (~ 960 Ma). Some of these pegmatites are mineralized in columbite-tantalite. At ~940 Ma, cassiterite- mineralized quartz veins formed. In the pegmatite area, this hydrothermal phase resulted in an intense alteration of the pegmatitic bodies.
Citation
Dewaele, S.; Fernandez-Alonso, M.; Tack, L. (2008). Cassiterite and columbo-tantalite (Coltan) mineralisation in the Proterozoic rocks of the northern part of the Kibara orogen (Central Africa): preliminary results. , Bull. Scéanc. Acad.R. Sci. Outre-Mer, Vol. 54, 341-357, Royal Academy for Overseas Sciences, ISSN: 0001-4176,Type
Article
Peer-Review
Yes
Language
eng