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New Evidence of the Polycyclic Genesis of Platinum Placer-Forming Formations of the Kondyor Alkaline-Ultramafic Massif: Results of 190Pt–4He Dating

  • GEOLOGY OF ORE DEPOSITS
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Abstract

This article presents the 190Pt–4He dating results of native platinum group minerals from a unique platinum-metals placer deposit in the basin of the Kondyor and Uorgalan rivers and dunite fragments from the Kondyor alkaline-ultramafic massif. The results of 190Pt–4He dating of 75 samples determine the age of the minerals and also date the ore-forming processes. It confirms the previously developed model of polycyclic genesis of placer-forming formations of platinum group minerals (PGMs) and, thus, sheds light on the duration of the formation of the Kondyor alkaline-ultramafic massif. The following 190Pt–4He age stages are distinguished: (a) 143 ± 7 Ma, the formation time of the massif itself and early formation stages of PGMs of magmatogenic platinum (Pt) and the magmatogenic–fluid–metasomatic Pt and Os–Pt (Pt > Os) types, as well as PGMs of fluid-metamorphogenic iridium–platinum (Pt > Ir) type; (b) 128 ± 6 Ma, the early formation stages of the magmatogenic–fluid–metasomatic Pd–Pt (Pt > Pd) type and the late stages of the Pt, Pt > Os, and Pt > Ir types; (c) 115 ± 6 Ma, the late formation stages of the Pt > Pd type. The good agreement of these dates with the geological and mineralogical data allows us to conclude that the formation of placer-forming PGMs and their formations in the Kondyor alkaline-ultramafic massif was a polycyclic process for about 30 Ma.

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ACKNOWLEDGMENTS

We are grateful to A.B. Kotov, E.M. Goryacheva, N.N.   Kononkova, O.L. Galankina, E.S. Ivanova, and B.M. Gorokhovskii for practical assistance in carrying out this research.

Funding

This work was supported by the Russian Foundation for Basic Research (project no. 18-05-00718 а), the Scottish Universities Environmental Research Centre and St. Petersburg State University (travel grant no. 41128295), and MON (grant no. 13-1902-21-0018).

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Authors and Affiliations

  1. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    A. G. Mochalov & O. V. Yakubovich

  2. Saint Petersburg State University, 199034, St. Petersburg, Russia

    O. V. Yakubovich

  3. Isotope Geosciences Unit, Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, United Kingdom

    F. M. Stuart

  4. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017, Moscow, Russia

    N. S. Bortnikov

Authors
  1. A. G. Mochalov
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  2. O. V. Yakubovich
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  3. F. M. Stuart
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  4. N. S. Bortnikov
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Correspondence to A. G. Mochalov.

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Translated by D. Voroshchuk

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Mochalov, A.G., Yakubovich, O.V., Stuart, F.M. et al. New Evidence of the Polycyclic Genesis of Platinum Placer-Forming Formations of the Kondyor Alkaline-Ultramafic Massif: Results of 190Pt–4He Dating. Dokl. Earth Sc. 498, 372–378 (2021). https://doi.org/10.1134/S1028334X2105010X

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