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Heterogeneity of Mantle Peridotites from the Polar Urals (Russia): Evidence from New LA-ICP-MS Data

  • Special Issue on Ophiolite, Orogenic Magmatism and Metamorphism Dedicated to IGCP 649: Diamonds and Recycled Mantle
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Abstract

To discuss the nature of the compositional heterogeneity of the peridotite massifs of the Polar Urals (Russia), the geochemical study by LA-ICP-MS of pyroxenes and amphiboles from these mantle formations was performed. The trace element compositions in clinopyroxenes indicate the existence of the mantle protolith of two types. The first protolith type, represented by lherzolites and diopside harzburgites, was originated from the partial melting (5%–10%) under the spinel fades conditions, while the second one, represented by diopside harzburgites, was formed under the polybaric partial melting (17%–19%) under garnet and spinel fades conditions. Subsequently, the mantle peridotite protolith was subject to fluid-induced partial melting in the suprasubduction setting that was resulted in the formation of harzburgites. Being affected by penetrating melts and fluids peridotites experienced the refertilization (LREE enrichment of clinopyroxenes) and high-temperature hydratation with subsequent development of pargasite and Mg amphibole. The high-T fluid-induced metamorphism at the subduction zone was accompanied by the formation of metaperidotites with clinochlore and REE-depleted tremolite.

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Acknowledgments

We are grateful to Dr. Mohamed Zaki Khedr (Kanazawa University, Japan) for assistance in performing analytical studies, as well as Vladimir G. Kotelnikov (Federal State Institution “VSEGEI”, St. Petersburg, Russia) and Dmitriy V. Kuznetsov (Institute of Geology and Geochemistry UB RAS, Yekaterinburg, Russia) for their assistance in carrying out field works in the Polar Urals. We are very grateful to the reviewers for their constructive comments that have been very helpful in improving the manuscript. This study was carried out within the framework of the Project IGCP-649 and the IGG UB RAS (No. AAAA-A18-118052590029-6). The final publication is available at Springer via https://doi.org/10.1007/sl2583-019-1224-y.

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Correspondence to Vladimir R. Shmelev.

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Shmelev, V.R., Arai, S. & Tamura, A. Heterogeneity of Mantle Peridotites from the Polar Urals (Russia): Evidence from New LA-ICP-MS Data. J. Earth Sci. 30, 431–450 (2019). https://doi.org/10.1007/s12583-019-1224-y

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  • DOI: https://doi.org/10.1007/s12583-019-1224-y

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