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New Results of U/Pb Dating of Cretaceous Igneous Rocks of the Komsomolsk Ore District (Middle Amur River Area)

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Abstract

The Komsomolsk tin-ore district is located along the Miao-Chan Ridge in the Middle Amur River area (Khabarovsk krai) within the Badzhal accretionary terrane of the Sikhote-Alin orogenic belt. This work presents new results of U–Pb zircon dating of tonalite from the Miao-Chan complex of the Silinka granite pluton (99.7 ± 1.1 Ma) and rhyolites of the lower part of the Kholdami Formation (98.4 ± 1.0 and 98.7 ± 1.2 Ma) from the northeastern part of the Komsomolsk district. The geochemical characteristics of the rocks studied show that granitoids of the Miao-Chan complex are I-type rocks and that synchronous rhyolites of the Kholdami Formation are highly aluminous and correspond to S-type rocks. New data on the composition and early Cenomanian age of the rocks make it possible to consider the ore-magmatic system of the Komsomolsk ore district as part of the previously identified Albian–Cenomanian igneous province of Pacific Asia.

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Funding

This work was supported by the Russian Science Foundation, grant no. 22-17-00198.

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Authors and Affiliations

  1. Far East Geological Institute, Far Eastern Branch, Russian Academy of Sciences, 690022, Vladivostok, Russia

    A. Yu. Lebedev, I. A. Alexandrov & V. V. Ivin

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  1. A. Yu. Lebedev
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  2. I. A. Alexandrov
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  3. V. V. Ivin
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Correspondence to A. Yu. Lebedev.

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Translated by L. Mukhortova

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Lebedev, A.Y., Alexandrov, I.A. & Ivin, V.V. New Results of U/Pb Dating of Cretaceous Igneous Rocks of the Komsomolsk Ore District (Middle Amur River Area). Dokl. Earth Sc. 515, 632–638 (2024). https://doi.org/10.1134/S1028334X23603802

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