N. I. GUSEV, E. I. BERZON, M. I. SEMENOV

KIZIKCHADR PORPHYRY COPPER DEPOSIT (TUVA): GEOCHEMICAL FEATURES AND AGE OF MAGMATISM

The Kizikchadr gold-bearing porphyry copper deposit is located in intrusive massif, which included are five phases of implementation: 1) gabbrodiorites, 2) quartz monzodiorites, 3) granodiorites, 4) granites, 5) subvolcanic intrusions and porphyry dikes of intermediate and acidic rocks. The age (zircon U-Pb, SHRIMP II) of granites of 508 ± 7 Ma, quartz porphyry of 507 ± 2 Ma, granodiorite-porphyry of 490 ± 4 Ma. Small porphyritic intrusions, which productive for gold-copper mineralization, possess geochemical characteristics of post-collisional adakite-like granitoids and have distinctive low contents of Y and Mn. The porphyry magmatism age of Kyzykchadr ore field coincides with Re-Os age of gold-sulphide mineralization of Sukhoi Log and Olympiada deposits as well as the age of porphyry copper mineralization of Aksug deposit and molybdenum mineralization of Sora deposits.

Keywords: Tuva, Kizikchadr deposit, porphyry gold-copper mineralization, adakite-like granitoids, zircon U-Pb age SHRIMP II