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A brief review of some major types of Proterozoic metal deposits indicates that each type is characterized by a distinctive lithologic and tectonic setting. The main types of metalliferous ores considered are: volcanic-hosted massive sulfide deposits, sediment-hosted massive sulfide deposits, stratiform copper deposits, carbonate-hosted lead-zinc deposits, magmatic copper-nickel deposits, and banded iron formations.

Metal deposits in sedimentary and volcanic rocks dominate Proterozoic metal-logeny, and it can be demonstrated that most formed in tectonic environments characterized by rifting. This association is reinforced by the time-space relationship between specific tectonic environments and metal deposits during Proterozoic time.

Although Proterozoic metal deposits are...

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