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The Evidence of Cumulate Crystallization and Local Development of the Eclogite Facies Metamorphism in Olivine Gabbro of the Marun-Key Complex (Polar Urals, Russia)

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Abstract—

This work presents the results of a detailed petrological study of olivine gabbro transformed to a different extent during the eclogite facies metamorphism. The textural features of cumulate crystallization in the rock at the magmatic stage are presented. Due to the significant transformations during eclogite facies metamorphism plagioclases were replaced by a fine-grained aggregate of high-pressure mineral paragenesis. Corona textures are developed along the boundaries of plagioclase (felsic) domains at the contacts with (Fe, Mg)-minerals during eclogite facies events. Mineral thermobarometry and phase equilibrium modeling provide P–T metamorphic conditions in relatively narrow temperature and pressure ranges: T = 680 ± 60°C and Р = 2.2 ± 0.4 GPa. This is in a good agreement with the previously established formation conditions of eclogites and garnet–amphibole peridotite from the same complex.

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ACKNOWLEDGMENTS

We are grateful to E.V. Guseva for assistance in analytical studies and A.A. Ariskin for consultations on cumulate textures.

Funding

Equipment purchased within the framework of the Moscow University Development Program was used for our studies.

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Authors and Affiliations

  1. Department of Geology, Moscow State University, 119234, Moscow, Russia

    Y. Y. Liu, A. L. Perchuk & N. G. Zinovieva

  2. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russia

    A. L. Perchuk

Authors
  1. Y. Y. Liu
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  2. A. L. Perchuk
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  3. N. G. Zinovieva
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Correspondence to Y. Y. Liu, A. L. Perchuk or N. G. Zinovieva.

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Translated by D. Voroshchuk

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Liu, Y.Y., Perchuk, A.L. & Zinovieva, N.G. The Evidence of Cumulate Crystallization and Local Development of the Eclogite Facies Metamorphism in Olivine Gabbro of the Marun-Key Complex (Polar Urals, Russia). Moscow Univ. Geol. Bull. 74, 321–331 (2019). https://doi.org/10.3103/S0145875219030050

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