N.T. Pak, E.A. Ivleva (IG NAS KR), N.V. Shatova, V.V. Shatov, S.A. Sergeev (Karpinsky Institute), I.M. Raimzhanov (Alliance Altyn LLC)

JEROOY GOLD DEPOSIT (NORTHERN TIEN SHAN, KYRGYZSTAN): U-PB SIMS GEOCHRONOLOGY OF INTRUSIVE COMPLEXES, HYDROTHERMALLY ALTERED FORMATIONS AND FORMATION MODEL

The article discusses new data obtained during the mineralogical, petrographic, pet­rogeochemical, and isotope geochronological study of igneous rocks of the Jerooy ore field, located in the western part of the Northern Tien Shan. The large Jerooy gold deposit of the gold-quartz type is confined to the diorites of the Jerooy complex. The results of geochronological studies (U-Pb SIMS study of accessory zircons) revealed the age of magmatic crystallization of the Jerooy complex diorites, which host gold mineralization, in the range of 462–469 Ma, and the more ancient Precambrian granites of the Tabalyk complex, in the range of 1160–1161 Ma. The petrochemical and geochemical characteristics of intrusive rocks participating in the geological structure of the Jerooy ore field are given. A model for the formation of the Jerooy deposit is proposed and its geodynamic position is determined.
Keywords: gold deposit, intrusive complexes, U-Pb SIMS geochronology, hydrothermal alteration, formation model.