Abstract
In our 40Ar/39Ar geochronological study, the age of gold mineralization of the Elga deposit is determined. The Elga deposit is located in the eastern part of the Mongol-Okhotsk fold belt. The data obtained indicate that the age of ore metasomatites and hydrothermally and metasomatically altered carbon-bearing sericite-feldspar-quartz shales can be estimated at 139–137 Ma. It is impossible to link the ore mineralization of the Elga deposit with magmatic processes since the igneous complexes located within the study area are either younger or significantly older than mineralization. The sericite from the Talyma Formation shales outside the ore zone is found to be almost of the identical age, that is, 139 Ma. Thus, the final stage of regional metamorphism and deformation is coeval with the formation of ore metasomatites. We suggest that the main factors in the mobilization, redistribution of the ore matter and the formation of the Elga deposit were post-collisional dislocation processes accompanied by hydrothermal activity and metasomatism.
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