Uranium-Lead and Lu-Hf Isotope Systematics of Zircon and Sm-Nd Isotopes in Rocks of the Dyumtaley Ore-Bearing Intrusion (Taimyr, Russia): New Evidence for the Role of the Depleted Mantle in Its Genesis

摘要

This study utilized SHRIMP, LA MC–ICP–MS and ID-TIMS analytical techniques and presents for the first time U–Pb age, Lu-Hf-isotope features of zircon and the Nd-isotope composition of variously mineralized rocks from the ore-bearing Dyumtaley intrusion, one of the most promising targets for platinum-group element (PGE)-Cu–Ni ores within the Taimyr metallogenic province.~(206)Pb/~(238)U ages of zircon from monzodiorite and gabbro of the Dyumtaley intrusion (250.9 ± 3.1 to 253 ± 1 Ma, respectively) indicate their close temporal relationship to a Permo-Triassic boundary and synchronism with a tholeiite-basaltic volcanism of the Siberian platform. Hafnium-neodymium isotope signatures (εHf_(( t ))6.9–8.5, εNd_(( t ))2.9–4.2) imply the significant role of the depleted mantle material in magma generation of the Dyumtaley intrusion.