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Abstract <p>The U–Th–Pb geochronological studies of detrital zircon from sandstones of the Rossony, Rudamina, and Lontova formations were conducted using core samples from the parametric Severo-Polotskaya borehole drilled in the southern part of the Latvian Saddle in Belarus. According to the biostratigraphic data, the Rossony Formation is attributed to the Upper Vendian Kotlin Regional Stage (characterized by a fossil assemblage of <i>Aataenia reticularis–Primoflagella speciosa–Vendotaenia antiqua</i>), while the overlying Rudamina and Lontova formations are attributed to the undifferentiated Lower Cambrian Rovno–Lontova regional stages (characterized by an assemblage with <i>Teophipolia lacerata</i>). The primary sources of detrital zircon in all studied stratigraphic units were rocks of the Fennoscandian crystalline basement (1.95–1.76 Ga), as well as igneous complexes of the Belarusian–Baltic granulite belt (1.66–1.50 Ga) and the Danopolon orogen (1.47–1.42 Ga) in southwestern Fennoscandia. A persistent cluster of young zircon with an age of 599–542&#xa0;Ma was identified in the Rudamina Formation; its most probable source is considered to be rocks of the Volyn–Brest magmatic province. The appearance of this new source during the Rudamina time, coupled with a reduced influx of detrital material from the 1.47–1.42 Ga source, is indicative of changes in sediment provenance provinces at the Vendian–Cambrian boundary.</p>

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Detrital Zircon U–Th–Pb Age of the Ediacaran–Cambrian Transitional Deposits in Northern Belarus (Severo-Polotskaya Borehole)

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • T. S. Zaitseva,
  • E. Yu. Golubkova,
  • A. B. Kuznetsov,
  • K. A. Dubkova,
  • T. V. Voskoboynikova,
  • E. A. Kushim

摘要

Abstract

The U–Th–Pb geochronological studies of detrital zircon from sandstones of the Rossony, Rudamina, and Lontova formations were conducted using core samples from the parametric Severo-Polotskaya borehole drilled in the southern part of the Latvian Saddle in Belarus. According to the biostratigraphic data, the Rossony Formation is attributed to the Upper Vendian Kotlin Regional Stage (characterized by a fossil assemblage of Aataenia reticularis–Primoflagella speciosa–Vendotaenia antiqua), while the overlying Rudamina and Lontova formations are attributed to the undifferentiated Lower Cambrian Rovno–Lontova regional stages (characterized by an assemblage with Teophipolia lacerata). The primary sources of detrital zircon in all studied stratigraphic units were rocks of the Fennoscandian crystalline basement (1.95–1.76 Ga), as well as igneous complexes of the Belarusian–Baltic granulite belt (1.66–1.50 Ga) and the Danopolon orogen (1.47–1.42 Ga) in southwestern Fennoscandia. A persistent cluster of young zircon with an age of 599–542 Ma was identified in the Rudamina Formation; its most probable source is considered to be rocks of the Volyn–Brest magmatic province. The appearance of this new source during the Rudamina time, coupled with a reduced influx of detrital material from the 1.47–1.42 Ga source, is indicative of changes in sediment provenance provinces at the Vendian–Cambrian boundary.