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Abstract— <p>The Okhotsk Massif is one of the least studied regions of our country, where modern isotopic-geochronological methods have been applied only to identify the age of the crystalline basement. Traditionally, Paleozoic magmatism was considered to be Late Devonian, whereas all younger magmatic complexes were considered to be Late Cretaceous. However, U–Pb dating of a granite intrusion of the Sibegin Complex, previously regarded as Devonian, and of a rhyolite body previously regarded as Late Cretaceous, showed ages of 337 ± 2 and 340 ± 2 Ma, respectively, i.e., both are Early Carboniferous (Visean) in age. The chemical composition of both magmatic bodies indicates their origin in an island-arc environments. Together with data on magmatism of similar age and composition in the Omolon Massif and along the southeastern margin of the Siberian Craton, this allows reconstruction of an Early Carboniferous active margin connecting the Siberian Craton, Okhotsk and Omolon massifs.</p>

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Early Carboniferous Magmatic Complexes of the Central Okhotsk Massif: First U–Pb Ages and Their Implications for Paleotectonic Reconstructions of Northeast Asia

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • V. N. Aleksandrov,
  • A. K. Khudoley,
  • V. V. Shatov,
  • V. A. Plaksina

摘要

Abstract—

The Okhotsk Massif is one of the least studied regions of our country, where modern isotopic-geochronological methods have been applied only to identify the age of the crystalline basement. Traditionally, Paleozoic magmatism was considered to be Late Devonian, whereas all younger magmatic complexes were considered to be Late Cretaceous. However, U–Pb dating of a granite intrusion of the Sibegin Complex, previously regarded as Devonian, and of a rhyolite body previously regarded as Late Cretaceous, showed ages of 337 ± 2 and 340 ± 2 Ma, respectively, i.e., both are Early Carboniferous (Visean) in age. The chemical composition of both magmatic bodies indicates their origin in an island-arc environments. Together with data on magmatism of similar age and composition in the Omolon Massif and along the southeastern margin of the Siberian Craton, this allows reconstruction of an Early Carboniferous active margin connecting the Siberian Craton, Okhotsk and Omolon massifs.