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Abstract <p>The paper presents the results of U–Pb (CA-ID-TIMS) geochronological studies of columbite-tantalite and zircon from the pegmatite vein of the Aleksandrovskoye ore field, which is part of the East Sayan rare-metal pegmatite 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 pegmatite vein and 1817 ± 5 Ma for the zone of intense alteration of amphibolites within its exocontact. The age estimate of 1810 ± 5 Ma was obtained for metamict zircon from the boundary zone of the quartz core. The studies suggest that the age of rare-metal pegmatites of the Aleksandrovskoye ore field in the East Sayan pegmatite belt differs significantly from that of the spatially conjugated granitoids of the Sayan complex (1.86–1.90 Ga).</p>

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Age of Rare-Metal Pegmatites of the Aleksandrovskoye Ore Field, East Sayan Pegmatite Belt

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • A. A. Ivanova,
  • E. B. Salnikova,
  • L. G. Kuznetsova,
  • V. M. Makagon,
  • A. B. Kotov,
  • Yu. V. Plotkina,
  • I. V. Levitsky

摘要

Abstract

The paper presents the results of U–Pb (CA-ID-TIMS) geochronological studies of columbite-tantalite and zircon from the pegmatite vein of the Aleksandrovskoye ore field, which is part of the East Sayan rare-metal pegmatite 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 pegmatite vein and 1817 ± 5 Ma for the zone of intense alteration of amphibolites within its exocontact. The age estimate of 1810 ± 5 Ma was obtained for metamict zircon from the boundary zone of the quartz core. The studies suggest that the age of rare-metal pegmatites of the Aleksandrovskoye ore field in the East Sayan pegmatite belt differs significantly from that of the spatially conjugated granitoids of the Sayan complex (1.86–1.90 Ga).