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This study presents the first results of oxygen isotope analyses (δ18O) collected on zircons from the Talnakh economic intrusion within the Noril’sk province. Zircons from gabbro-diorite, gabbroic rocks of the layered series and plagioclase-bearing wehrlite have similar mantle-like mean δ18O values (5.39 ± 0.48‰; 5.63 ± 0.48‰ and of 5.28 ± 0.34‰, respectively), which differ from δ18O in zircons from sulfide-bearing melanocratic troctolite with taxitic texture in the lower part of the intrusion (mean δ18O = 6.50 ± 0.98‰). These new oxygen isotope data support (i) the mantle-derived origin of the primary magma(s), parental to the Talnakh intrusion, and (ii) possible involvement of a crustal component during the formation of sulfide-bearing taxitic-textured rocks.
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