Ar AND He ISOTOPES IN THE DOVYRA MAFIC-ULTRAMAFIC INTRUSION
E. G. Konnikov, E. M. Prasolov, I. V. Tokarev, E. V. Kislov, and D. A. Orsoev
Keywords: Isotopes, helium, argon, fluids, contamination, layered intrusions
Pages: 543-552
Abstract
The paper presents results of Ar and He isotopic studies in rocks and sulphide ores of the Late Precambrian Dovyra dunite-troctolite layered intrusion (Northern Baikal region). The intrusion shows 3He/4He and 40Ar/36Ar ratios similar to other basic intrusions in the continental crust, and the gases in fluid inclusions contain a significant crystal component. The lowest 3He/4He and 40Ar/36Ar ratios, similar to those typical of fluids in the continental crust, were found in sulphide ores of the intrusion, which indicates involvement of crystal fluids in magmatic mineralization of the intrusion.
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