ПетрологияПетрология0869-5903The Russian Academy of Sciences1158310.31857/S0869-5903272138-160Research ArticleHigh pressure metamorphism in the peridotitic cumulate of the Marun-Keu complex, Polar UralsLiuY. Y.alp@geol.msu.ruPerchukA. L.alp@geol.msu.ruAriskinA. A.alp@geol.msu.ruM. V. Lomonosov Moscow State UniversityD.S. Korzhinsky Institute of Experimental Mineralogy, Russian Academy of SciencesVernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences020420192721381600204201902042019Copyright © 2019, Russian Academy of Sciences2019<p>The Marun-Keu Complex of high-pressure rocks comprises granitoids, gneisses, schists, gabbroids and peridotites, which are unevenly and variably metamorphosed to the eclogite facies. A representative sample of garnetamphibole lherzolite from the Mount Slyudyanaya area shows a cumulate texture and well preserved magmatic mafic minerals (olivine and pyroxenes) but practically no preserved plagioclase. The eclogite-facies metamorphism produced corona textures of newly formed minerals: amphibole, garnet, orthopyroxene and spinel. The metamorphic parameters of the garnetamphibole lherzolite were estimated by geothermobarometry and by modeling phase equilibria at Р ~ 2.1 GPa and T ~ 640740C and are well consistent with our earlier estimate of the formation conditions of eclogites in the area. Computer simulation of the crystallization process of the gabbroic melt with the COMAGMAT program package, using literature data on the composition of the least altered plagioclase peridotites and gabbroids from the Marun-Keu Complex, shows that the mafic and ultramafic rocks are genetically interrelated: they crystallized in a single magmatic chamber. According to the modeling, the origin of the cumulate texture in the lherzolite was controlled by the peritectic reaction Ol + melt Opx at a pressure of 0.70.8 GPa and a temperature of 12551268C. 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