Relationships of gold mineralization to deep-seated low-density domains of granitization are considered. The gold mineralization originates in the zones of interaction of these domains with femic rocks established from the results of regional magnetic survey or with thick folded sequences of carbonaceous clay rocks and intercalated members of femic volcanics. The intensity of granitization decreases from continent to ocean, and the ore-forming centers and mineralization are rejuvenated in this direction from the Jurassic-Cretaceous to the Pleistocene, while the productivity of the ore-forming process remains unchanged.
It was established that the age of hydrothermal metasomatites of the Albyn gold deposit, one of the most famous in eastern Asia, can be estimated at 135-131 Ma. It is assumed that the formation of this deposit is associated with dislocations and metamorphism of volcanogenic-sedimentary strata of the Mongol-Okhotsk belt.
To the best of our knowledge, this study is the first to reliably assess the age of gold mineralization in the Malomyr field (eastern part of the Mongolian-Okhotsk fold belt), one of the best known deposits in the Far East. The obtained data confirmed that the age of the hydrothermal ore process that resulted in the formation of the Malomyr deposit was ~ 134–130 million years and that the age of the postore dykes was 110–104 million years. Data related to the occurrence of magmatism within the region under consideration were not available, which made it impossible to link the ore mineralization of the Malomyr deposit with the magmatic processes. Based on the data obtained in this investigation, the dislocation processes accompanied by the hydrothermal activity that was confirmed using the structural examinations results evidently played a significant role in ore mobilization and redistribution as well as the formation of the Malomyr deposit. The first Rb-Sr and δ34S results of this research indicated that both the “crust” and “mantle” sources were available among the ore sources.
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