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Orbicular Peridotites of the Polar Urals: New Evidence of Magmatic Impregnation in Ophiolites

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Abstract

Peridotites of an unusual orbicular structure, attributed to the impregnated type of rocks, were found in ophiolites of the Voikar massif (Polar Urals). Orbicules in these rocks are composed of a secondary clinochlore–diopside aggregate containing grains of primary clinopyroxene and pargasite. The morphology and composition of orbicules make it possible to attribute them to segregations (globules) of the melt in the olivine matrix of peridotites that have experienced partial crystallization in situ. According to geochemical modeling results, these melts had characteristics transitional to boninites, corresponding to the suprasubduction conditions. The formation of orbicular peridotites was associated with blocking intergranular channels of the percolating basaltic melts.

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ACKNOWLEDGMENTS

We are grateful to the staff of the Geoanalitik Center for Collective Use, Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, where the analytical research was conducted.

Funding

This work was performed within the framework of the state-financed project nos. АААА-А18-118052590029-6 and АААА-А18-118053090045-8.

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Authors and Affiliations

  1. Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    V. R. Shmelev & M. V. Chervyakovskaya

  2. Karpinsky All-Russia Geological Research Institute, 199106, St. Petersburg, Russia

    V. G. Kotelnikov

Authors
  1. V. R. Shmelev
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  2. V. G. Kotelnikov
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  3. M. V. Chervyakovskaya
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Correspondence to V. R. Shmelev.

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Translated by D. Voroshchuk

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Shmelev, V.R., Kotelnikov, V.G. & Chervyakovskaya, M.V. Orbicular Peridotites of the Polar Urals: New Evidence of Magmatic Impregnation in Ophiolites. Dokl. Earth Sc. 498, 418–422 (2021). https://doi.org/10.1134/S1028334X21050184

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  • DOI: https://doi.org/10.1134/S1028334X21050184

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