It is suggested that these mineral deposits were emplaced by an explosive CO 2 gas drive and that the diamond-bearing rocks have come up from a depth of not less than 200 km. CO 2 vacuoles in minerals associated with the diamonds (Roedder) suggest partial pressure of CO 2 equal to confining pressure at time of diamond formation. Thermodynamic calculations show that this condition is required in order to have diamond crystals stable in an environment that contains substantial ferrous and some ferric iron. Thus a vital role is attributed to CO 2 in both the genesis and emplacement of diamond deposits.

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