THE FIRST ⁴⁰Ar/³⁹Ar GEOCHRONOLOGICAL DATA FOR ORE METASOMATITES OF THE UNGLICHIKAN GOLD DEPOSIT, EASTERN PART OF THE MONGOL-OKHOTSK FOLD BELT

Abstract

In our isotope-geochronological study, the age of ore metasomatites of the Unglichikan gold deposit is determined at 140–136 Ma. Magmatism of this age is absent in the study area, and it is thus unreasonable to relate the ore mineralization in the Unglichikan deposit to any magmatic process. We conclude that in the mobilization and redistribution of the ore material and the formation of the Unglichikan deposit, a significant role was played by dislocation processes accompanied by hydrothermal activity during the final stages of orogenesis in the Mongol-Okhotsk belt.

Keywords

• mongol-okhotsk fold belt
• unglichikan deposit
• gold
• geochronology