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Abstract <p>The paper reports U–Pb zircon age data on igneous rocks from the Vetrenskaya area (upper reaches of the Kolyma River), as well as major and trace element compositions of these rocks. Based on these data, four major pulses of magmatic activity may be distinguished (age of events in million years: ca. 170, 153–144, 95–94, and 86–82). The first two pulses were presumably related to the formation of the supra-subduction Uyandina–Yasachaya volcanic belt and the Main Batholith belt of the Kolyma region. The third and fourth pulses are likely genetically linked to the Okhotsk-Chukotka volcanic belt (OCVB). Despite the differences in age, the studied igneous rocks are generally characterized by a similar composition, which may be attributed to the melting of the same protolith. Of the total seven plutonic complexes identified within the observed area, four (the Nera-Bokhapcha, Basugun’in, Siberdik, and Kolyma complexes) are represented by intrusive bodies whose age, rock chemistry, and the position in the regional geological frame are very similar. In the light of the new data, such a detailed subdivision of the plutonic rocks looks unnecessary.</p>

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Late Mesozoic Granitoids of the Upper Kolyma River Region: Composition, U–Pb Geochronology, Petrogenesis, and Potential Need to Revise Regional Geologic Map Legends

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • P. L. Tikhomirov,
  • A. A. Ustinov,
  • G. S. Kolotygin

摘要

Abstract

The paper reports U–Pb zircon age data on igneous rocks from the Vetrenskaya area (upper reaches of the Kolyma River), as well as major and trace element compositions of these rocks. Based on these data, four major pulses of magmatic activity may be distinguished (age of events in million years: ca. 170, 153–144, 95–94, and 86–82). The first two pulses were presumably related to the formation of the supra-subduction Uyandina–Yasachaya volcanic belt and the Main Batholith belt of the Kolyma region. The third and fourth pulses are likely genetically linked to the Okhotsk-Chukotka volcanic belt (OCVB). Despite the differences in age, the studied igneous rocks are generally characterized by a similar composition, which may be attributed to the melting of the same protolith. Of the total seven plutonic complexes identified within the observed area, four (the Nera-Bokhapcha, Basugun’in, Siberdik, and Kolyma complexes) are represented by intrusive bodies whose age, rock chemistry, and the position in the regional geological frame are very similar. In the light of the new data, such a detailed subdivision of the plutonic rocks looks unnecessary.