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The Iorokhan Complex of Minor Intrusions in the Eastern Part of the Bureya Massif: Geology, Age, and Gold Mineralization

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Abstract

We analyze and generalize new data inferred from the geological, geochronological, and metallogenic studies performed in recent decades on igneous rocks of the Iorokhan gold-bearing complex in the eastern Bureya Massif. It is shown that four phases are determinative of the structure of the Iorokhan complex of minor intrusions whose rocks are referred to hypabyssal and subvolcanic intrusive facies. Specific features of their rock composition and structural tectonic conditions of localization are described and geological and geochronological (103 ± 1.0-97.4 ± 6.5 Ma) data on their Late Albian–Early Cenomanian age are presented. Based on the alumina, calcium, and alkali ratio, the major part of their compositions corresponds to the I-type (A/CNK < 1.1) high-alumina magnesia and magnesia–ferruginous varieties with decreased HFSE concentrations, including HREE. Melts formed due to amphibolite source melting might have been the deep sources of the Iorokhan diorites. The Noni deposit is briefly described and the main localization factors of the gold-ore mineralization are considered. The Iorokhan magmatite areals of the East Bureya Volcano–Plutonic Zone may be considered as one of the fragments of the structure bordering between the continental margin of the Bureya Massif and the accretionary prisms of the Sikhote Alin Orogenic Belt. The Iorokhan complex of minor intrusions is assumed to be a small fragment of an extensive band of Late Albian–Early Cenomanian magmatites developed in southern Far East Russia that originated under the transform continental marginal setting, and a combination of synstrike–slip compression and extension zones typical of such margins with further development of the pull-apart depressions.

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ACKNOWLEDGMENTS

The authors express their sincere gratitude to A.I. Khanchuk, Academician of the Russian Academy of Sciences, and V.V. Akinin, a Corresponding Member of the Russian Academy of Sciences (North Eastern Integrated Scientific Research Institute of the Far East Branch of the Russian Academy of Sciences) for the critical analysis of the manuscript. Their remarks and suggestions contributed to significant improvement of the manuscript.

Funding

This study was performed within the framework of the State Assignment for the Kosygin Institute of Tectonics and Geophysics of the Far East Branch of the Russian Academy of Sciences (ITiG FEB RAS) and supported by the Federal Agency of Management of the Interiors (State contract to prepare the publication of the State Geological Map 200, sheets M-53-XIII and M-52-XII).

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Authors and Affiliations

  1. Kosygin Institute of Tectonics and Geophysics, Far East Branch, Russian Academy of Sciences, ul. Kim Yu Chena 65, 680000, Khabarovsk, Russia

    E. V. Nigai, V. A. Guryanov & M. V. Arkhipov

  2. Dal’nevostochnoye PGO Rosgeologiya Joint-Stock Company, Khabarovsk, Russia

    S. N. Dobkin

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  1. E. V. Nigai
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  2. V. A. Guryanov
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  3. S. N. Dobkin
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  4. M. V. Arkhipov
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Correspondence to V. A. Guryanov.

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Recommended for publishing by A.I. Khanchuk

Translated by N. Kovriga

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Nigai, E.V., Guryanov, V.A., Dobkin, S.N. et al. The Iorokhan Complex of Minor Intrusions in the Eastern Part of the Bureya Massif: Geology, Age, and Gold Mineralization. Russ. J. of Pac. Geol. 15, 20–38 (2021). https://doi.org/10.1134/S1819714021010048

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