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Abstract <p>Basalt, gabbro, and plagiogranite samples were selected from various rock blocks in the ophiolitic melanges of the Polyarninsky Uplift of the South Anyui suture, from which several zircon populations were extracted for the first time. One of the populations allowed us to obtain concordant ages corresponding to the age of rock crystallization, amounting to 269 Ma (plagiogranite), 234 Ma (basalt), 151 Ma (gabbro), and 141&#xa0;Ma (gabbro). In addition to these zircons, generations of xenogenic zircons of different ages (2000–310 Ma) reflecting the various stages of the tectonic evolution of the Proto-Arctic basin from the earliest stage of its development were isolated from each rock. Delaminated slabs from past subductions that appeared during the evolution of the ocean or fragments of the ancient continental lithosphere that were preserved in the mantle and were later involved into melting were the potential sources of xenogenic zircons with different Paleozoic ages.</p>

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The First Data on the Age (U–Th–Pb SIMS) and Composition of Rocks in the Serpentinite Melanges of the Polyarninsky Uplift of the South Anyui Suture (Northeast Asia)

  • 期刊论文

  • 发表日期：

    2026年1月25日

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  • A. V. Ganelin,
  • S. D. Sokolov

摘要

Abstract

Basalt, gabbro, and plagiogranite samples were selected from various rock blocks in the ophiolitic melanges of the Polyarninsky Uplift of the South Anyui suture, from which several zircon populations were extracted for the first time. One of the populations allowed us to obtain concordant ages corresponding to the age of rock crystallization, amounting to 269 Ma (plagiogranite), 234 Ma (basalt), 151 Ma (gabbro), and 141 Ma (gabbro). In addition to these zircons, generations of xenogenic zircons of different ages (2000–310 Ma) reflecting the various stages of the tectonic evolution of the Proto-Arctic basin from the earliest stage of its development were isolated from each rock. Delaminated slabs from past subductions that appeared during the evolution of the ocean or fragments of the ancient continental lithosphere that were preserved in the mantle and were later involved into melting were the potential sources of xenogenic zircons with different Paleozoic ages.