Geochronological studies reveal ages of 1825 and 1817 Ma for rare-metal pegmatites in the Aleksandrovskoye ore field, indicating significant geological timelines.
This paper presents the results of U–Pb (CA-ID-TIMS) geochronological studies of columbite-tantalite and zircon from the pegmatic vein of the Aleksandrovskoye ore field, which is part of the East Sayan rare-metal pegmatic belt. As a result of U–Pb geochronological studies of columbite, age estimates of 1825±3 Ma were obtained for the first time for the quartz core of the pegmatic vein and 1817±5 Ma for the zone of intense alteration of amphibolites in its exocontact. The age estimate of 1810±5 Ma was obtained for metamict zircon from the boundary zone of the quartz core. The studies indicate that the age of rare-metal pegmatites of the Aleksandrovskoye ore field of the East Sayan pegmatic belt differs significantly from the age of spatially conjugated granitoids of the Sayan complex (1.86–1.90 Ga).
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A.A. Ivanova (2025) studied this question.
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