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The distribution of lamprophyre-hosted Neoarchean diamond deposits in the southern Superior Province, Canada, corresponds to that of coeval giant (>100 t Au) examples of “orogenic” gold deposits, which are typically associated with quartz-carbonate veining. This common association in the southern Superior Province, and at Yellowknife in the Slave craton, suggests that the occurrence of both diamonds and gold was promoted by the same geodynamic factors. A previously proposed subduction diamond model invokes flat subduction of buoyant oceanic plateau crust as the only means of entraining diamonds in shoshonitic lamprophyres, which are generally derived from relatively shallow mantle depths. Computer modeling...

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