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Composition and conditions of formation of the parental melts of Jurassic dolerites of southwestern Crimea: Evidence from melt inclusions in olivine phenocrysts

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Abstract

This study focuses on Jurassic shallow intrusions and subvolcanic bodies from around Trudolyubovka village in the southwestern Crimea. All the rocks are similar in mineral composition and have similar geochemical features and occur in close spatial and geological association. This allows us to assign the intrusions to a single magmatic series and interpret them as differentiation products of a single parental melt. The investigation of melt inclusions in olivine from the most magnesian sample showed that the composition of igneous melts ranged from basalt to basaltic andesite of a moderately potassic subalkaline affinity. Compared with N-MORB, they are enriched in LILE, but have similar HFSE and REE contents. The early magmatic melts crystallized at temperatures ranging from 1240 to 1125°C, pressures of 6–8 kbar, and an oxygen fugacity of ΔQFM = +0.6; and later melts crystallized at 1090–940°C, ~1.5 kbar, and oxygen fugacity increasing from ΔQFM + 0.9 to ΔQFM + 2.3. The minimum pressure of groundmass crystallization was estimated as 40–60 bar. The primitive melts were formed in a mature island arc or an active continental margin setting by ~13% melting of a DMM-like source. The melting occurred at spinel-facies depths under the influence of a slab-derived fluid at a temperature 25°C below the dry peridotite solidus.

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, Moscow, 119899, Russia

    D. V. Popov, N. Nekrylov, P. Yu. Plechov, V. D. Shcherbakov & M. S. Serova

  2. Department of Earth Sciences, University of Geneva, Rue des Maraîchers, 13, 1205, Geneva, Switzerland

    D. V. Popov

  3. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia

    P. Yu. Plechov & M. V. Portnyagin

  4. Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, 119017, Russia

    P. Yu. Plechov

  5. GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany

    M. V. Portnyagin

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Original Russian Text © D.V. Popov, N. Nekrylov, P.Yu. Plechov, V.D. Shcherbakov, M.V. Portnyagin, M.S. Serova, 2017, published in Petrologiya, 2017, Vol. 25, No. 3, pp. 265–298.

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Popov, D.V., Nekrylov, N., Plechov, P.Y. et al. Composition and conditions of formation of the parental melts of Jurassic dolerites of southwestern Crimea: Evidence from melt inclusions in olivine phenocrysts. Petrology 25, 272–303 (2017). https://doi.org/10.1134/S0869591117030031

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