Abstract
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 garnet–amphibole 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 garnet–amphibole lherzolite were estimated by geothermobarometry and by modeling phase equilibria at Р ~ 2.1 GPa and T ~ 640–740°C 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 lherzolites 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 0.7–0.8 GPa and a temperature of 1255–1268°C. Differences between thermodynamic parameters in the eclogites and garnet peridotites are discussed within the scope of a tectonic model proposed for subduction and subsequent exhumation of the Baltica paleocontinent.
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Notes
In fact, we conducted preliminary calculations within a broader pressure range of 1 atm to 1 GPa.
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ACKNOWLEDGMENTS
The authors thank E.V. Guseva and V.O. Yapaskurt (of the Moscow State University) for help with the analytical work. We highly appreciate discussion of our unpublished materials with A.Yu. Selyatitskii. We are thankful to S.T. Podgornova for help with preparing the manuscript. The reviewers S.A. Silantyev (Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences) and particularly L.Ya. Aranovich (Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences) are thanked for valuable comments.
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This study was carried out using equipment purchased under the Program for the Development of the Moscow State University.
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Liu, Y.Y., Perchuk, A.L. & Ariskin, A.A. High Pressure Metamorphism in the Peridotitic Cumulate of the Marun-Keu Complex, Polar Urals. Petrology 27, 124–145 (2019). https://doi.org/10.1134/S0869591119020061
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DOI: https://doi.org/10.1134/S0869591119020061