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Abstract <p>During the geological survey, conducted between 2017 and 2021 in the western part of the Kolyma–Omolon microcontinent, a zone of structural transformations was identified within the southeastern margin of the Middle Jurassic Rassokhinsky (Rassoshinsky) granitoid massif. Quartz veins and veinlets containing native gold are associated with this zone. Research revealed that the sulfur isotope composition in sulfides from this zone (δ<sup>34</sup>S ~ –15 ‰) is significantly lighter compared to that in molybdenite from the central part of the granitoid massif (δ<sup>34</sup>S ~ 5 ‰). In addition, (U,Th)-He dating of idiomorphic pyrite crystals, extracted from hydrothermally altered trachytes near a large quartz vein, gave an age of 65 ± 2 Ma (<i>n</i> = 4). The obtained data, combined with geological observations, point to the Early Paleogene tectonic-thermal activity in the region, which has led to the redistribution of ore components.</p>

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First Geochronological Evidence of the Early Paleogene Tectonic-Thermal Events in the Arga–Tass Thrust Zone (Northeastern Yakutia): Results of (U,Th)-He Dating of Pyrite

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • O. V. Yakubovich,
  • S. N. Sychev,
  • A. A. Salomatin,
  • A. B. Kotov,
  • M. O. Anosova,
  • I. V. Trifonov

摘要

Abstract

During the geological survey, conducted between 2017 and 2021 in the western part of the Kolyma–Omolon microcontinent, a zone of structural transformations was identified within the southeastern margin of the Middle Jurassic Rassokhinsky (Rassoshinsky) granitoid massif. Quartz veins and veinlets containing native gold are associated with this zone. Research revealed that the sulfur isotope composition in sulfides from this zone (δ34S ~ –15 ‰) is significantly lighter compared to that in molybdenite from the central part of the granitoid massif (δ34S ~ 5 ‰). In addition, (U,Th)-He dating of idiomorphic pyrite crystals, extracted from hydrothermally altered trachytes near a large quartz vein, gave an age of 65 ± 2 Ma (n = 4). The obtained data, combined with geological observations, point to the Early Paleogene tectonic-thermal activity in the region, which has led to the redistribution of ore components.