Abstract
This study presents the first results of oxygen isotope analyses (δ 18 O) 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 δ 18 O values (5,39 ± 0,49‰; 5,64 ± 0,48‰ and of 5,28 ± 0,34‰, respectively), which differ from δ 18 O in zircons from sulfide-bearing melanocratic troctolite with a taxitic texture in the lower part of the intrusion (mean δ 18 O = 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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