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Kamona, A.F. and Günzel, A. 2007. Stratigraphy and base metal mineralization in the Otavi Mountain Land, Northern Namibia—a review and regional interpretation. Gondwana Research, 11(3): 396–413


Description:

Stratigraphy and base metal mineralization in the Otavi Mountain Land, Northern Namibia—a review and regional interpretation.

Summary / Notes:

Sediment-hosted base metal sulfide deposits in the Otavi Mountain Land occur in most stratigraphic units of the Neoproterozoic Damara Supergroup, including the basal Nosib Group, the middle Otavi Group and the uppermost Mulden Group. Deposits like Tsumeb (Pb–Cu–Zn–Ge), Kombat (Cu–Pb–Zn), Berg Aukas (Zn–Pb–V), Abenab West (Pb–Zn–V) all occur in Otavi Group dolostones, whereas siliciclastic and metavolcanic rocks host Cu–(Ag) or Cu–(Au) mineralization, respectively. The Tsumeb deposit appears to have been concentrated after the peak of the Damara orogeny at around 530 Ma as indicated by radiometric age data. Volcanic hosted Cu–(Au) deposits (Neuwerk and Askevold) in the Askevold Formation may be related to ore forming processes during continental rifting around 746 Ma. The timing of carbonate-hosted Pb–Zn deposits in the Abenab Subgroup at Berg Aukas and Abenab is not well constrained, but the stable (S, O, C) and Pb isotope as well as the ore fluid characteristics are similar to the Tsumeb-type ores. Regional scale ore fluid migration typical of MVT deposits is indicated by the presence of Pb–Zn occurrences over 2500 km2 within stratabound breccias of the Elandshoek Formation. Mulden Group siliciclastic rocks host the relatively young stratiform Cu–(Ag) Tschudi resource, which is comparable to Copperbelt-type sulfide ores. Keywords: Neoproterozoic, Base metal deposit, Otavi Group, Damara Belt.

Year: 2007

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/S1342937X0600195X


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