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Petrology of mafic enclaves in the 2006–2012 eruptive products of Bezymianny Volcano, Kamchatka

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Abstract

This paper reports the results of the first comprehensive petrological study of mafic enclaves widespread in the products of recent (2006–2012) eruptions of Bezymianny Volcano, Kamchatka. Four types of mafic enclaves were distinguished on the basis of the composition and morphology of minerals, P–T conditions of formation of mineral assemblages, and structural and textural characteristics of the rocks. Disequilibrium assemblages of mafic enclaves indicate a complex structure of the magmatic plumbing system of the volcano, including a shallow chamber with andesite–basaltic andesite magmas and a deep reservoir filled in part with plagioclase–hornblende cumulates and fed by basic magmas with mantle harzburgite xenoliths. The mafic enclaves were formed at different levels of the magmatic plumbing system of the volcano and correspond to different degrees of mixing of interacting magmas. The most abundant enclaves were formed during magma ascent from the deep reservoir (960–1040°C, 5–9 kbar) into the shallow andesitic chamber (940–980°C). Enclaves of plagioclase–hornblende cumulates from the basic magmas feeding the deep reservoir (T > 1090°C and P > 9 kbar) are much less common.

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Authors and Affiliations

  1. Geological Faculty, Moscow State University, Moscow, 119991, Russia

    V. O. Davydova, V. D. Shcherbakov & P. Yu. Plechov

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

    P. Yu. Plechov

  3. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk, 664033, Russia

    A. B. Perepelov

Authors
  1. V. O. Davydova
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  2. V. D. Shcherbakov
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  3. P. Yu. Plechov
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  4. A. B. Perepelov
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Correspondence to V. O. Davydova.

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Original Russian Text © V.O. Davydova, V.D. Shcherbakov, P.Yu. Plechov, A.B. Perepelov, 2017, published in Petrologiya, 2017, Vol. 25, No. 6, pp. 609–634.

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Davydova, V.O., Shcherbakov, V.D., Plechov, P.Y. et al. Petrology of mafic enclaves in the 2006–2012 eruptive products of Bezymianny Volcano, Kamchatka. Petrology 25, 592–614 (2017). https://doi.org/10.1134/S0869591117060029

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