The paper presents results of Ar and He isotopic studies in rocks and sulfide ores of the Late Precambrian Dovyren dunite-troctolite-gabbro layered intrusion (Northern Baikal region). The 3He/4He and 40Ar/36Ar ratios are similar to those in other mafic intrusions in the continental crust, and gases in fluid inclusions bear a significant crustal component. The lowest 3He/4He and 40Ar/36Ar ratios in sulfide ores, about those in crustal fluids, indicate involvement of the latter in magmatic mineralization.

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