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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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 PT 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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Y. Liu

Department of Geology, Moscow State University

编辑信件的主要联系方式.
Email: yigyuan1990@gmail.ru
俄罗斯联邦, Moscow, 119234

A. Perchuk

Department of Geology, Moscow State University; Korzhinsky Institute of Experimental Mineralogy, Russian Academy of Sciences

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Email: alp@geol.msu.ru
俄罗斯联邦, Moscow, 119234; Chernogolovka, Moscow Region, 142432

N. Zinovieva

Department of Geology, Moscow State University

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Email: nzinov@mail.ru
俄罗斯联邦, Moscow, 119234

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