The Strontium Geochemistry of Calcite Associated with Kimberlite at Bachelor Lake, Quebec

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Abstract
In recent years several investigators have proposed that carbonatites and kimberlites may be genetically related, proposals based on field, petrographic, and phase equilibria studies. Isotopic studies of carbonate minerals associated with kimberlites are rare, however. The calcite associated with kimberlite at Bachelor Lake, Quebec, has been interpreted by Watson (1955, 1967) from geological and textural evidence as primary; and twenty samples have been analyzed with the following results: ; average Sr content (carbonate plus matrix) = 0.16 per cent. The normal non-carbonate kimberlitic minerals contribute essentially no Sr to the total Sr content, and a calculated average Sr content for the carbonate fraction is 0.40 per cent. This last figure and the Sr isotopic data are consistent with an original carbonatitic source for the calcite present in the kimberlites.