A critical review of the evidence which has been advanced in support of a syngenetic origin for the ores of the Northern Rhodesia copper belt, with particular reference to material in a recently published volume on the geology of the copper belt. Rather than a syngenetic origin, the close association of many of the ore bodies with gabbro intrusions, structural relations of certain of the ore shoots, and other features suggest a deep-seated hydrothermal origin for the ores. It is also noted that the zonal pattern of distribution of copper and iron sulfide minerals cannot be explained satisfactorily by any syngenetic theory so far propounded.

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