Abstract
Strontium, carbon, and oxygen isotopic compositions of carbonates from kimberlites of the Zimnii Bereg field (Arkhangelsk) were studied as a possible criterion for evaluating the diamond potential. The study objects are highly diamondiferous Grib Pipe, diamondiferous pipes of Zolotitsa field (Lomonosov and Pioner), and nondiamondiferous composite kimberlite‐ carbonate sills along the Mela River. The latter are of special interest as supplementary natural kimberlitebearing objects, emphasizing the close relation of kimberlites and carbonatites [1, 2]. In the light of isotopic geochemical data and experiments on CO 2 solubility, the participation of CO 2 in the generation of kimberlite magma seems to be inevitable [3, 4]. In addition to well-known Benfontein sill (South
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