Abstract
There has been found a distinct directional trend of kimberlites differing in ore-bearing potentiality with changing chemical composition. The contents of MgO, NiO and Cr2O3 decrease gradualy while Na2O, K2O, Al2O3 and P2O5 increase considerably in the order of diamond-rich—diamond-poor—diamond-barren kimberlites. In general Fe2O3, FeO and TiO2 also show an increasing tendency. Therefore, the variations in chemical composition may be used as petrochemical indexes for calculating the ore-bearing potentiality of kimberlites. Based on discriminant analysis, it is possible to make a distinction between diamond-bearing and diamond-barren, or between diamond-rich and diamond-poor kimberlites.
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