The bedded copper ores of the Roan Antelope mine in the southern part of the Northern Rhodesia copper belt occur in metamorphosed argillaceous rocks of the lower Roan group of the Precambrian Mine series, which unconformably overlies basement granite. Syngenetic and epigenetic theories of origin are reviewed, and evidence that the ores are syngenetic sulfides modified by dynamothermal metamorphism is advanced. It is suggested that the sulfides were precipitated by autotrophic bacteria in a shallow continental basin where circulation was restricted.

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