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Clinopyroxene megacrysts from Enmelen melanephelinitic volcanoes (Chukchi Peninsula, Russia): application to composition and evolution of mantle melts

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Abstract

Clinopyroxene megacrysts from young melanephelinitic lavas were divided into Cr-rich and Cr-poor suites. Sr, Nd, and Pb isotopic ratios of leached megacrysts and host lava are indistinguishable from each other and indicate a depleted source. Host lavas do not display chemical evidence for significant fractional crystallization, which is required to explain the compositional range of the megacrysts. This rules out a simple cognate genetic relationship between the two, and strictly defines megacrysts as xenocrysts. The well-defined correlations of trace elements with the Mg-numbers in the megacrysts are interpreted as the result of extensive fractional/equilibrium crystallization of magma over a large temperature range at near isobaric condition in the upper mantle. Trace element variations in megacrysts are consistent with fractional crystallization of clinopyroxene alone for the Cr-rich suite, and clinopyroxene + garnet for the Cr-poor suite from at least two bathes of related melts. Megacrysts parent magma might represent mantle melts, which were never erupted in their initial composition.

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Acknowledgements

VVA acknowledges the support of Institute of Petrology, Vienna, with travel and microprobe work. We greatly appreciate the informal review and help of L. Danyushevsky. The reviews of M. Roden and an anonymous person, as well as suggestions of I. Carmichael greatly improved the manuscript. This research was supported in part by Russian Foundation of Basic Research (grant 96-05-66124, 01-05-65453 to VVA) and in part by the Federal Ministry for Education, Science and Culture (Pr. Nr. G7 45.482/1-VII/B/8/2000, PI. W. Richter).

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Authors and Affiliations

  1. North-East Interdisciplinary Science Research Institute, Russian Academy of Sciences, Portovaya Street 16, Magadan, Russia, 685000

    Vyacheslav V. Akinin

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygina St., 19, Moscow, 117975, Russia

    Alexander V. Sobolev

  3. Institute of Petrology, University of Vienna – Geozentrum, Althanstr. 14,  , Austria

    Theodoros Ntaflos & Wolfram. Richter

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  1. Vyacheslav V. Akinin
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  2. Alexander V. Sobolev
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  3. Theodoros Ntaflos
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  4. Wolfram. Richter
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Correspondence to Vyacheslav V. Akinin.

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Communicated by I. Carmichael

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Akinin, V.V., Sobolev, A.V., Ntaflos, T. et al. Clinopyroxene megacrysts from Enmelen melanephelinitic volcanoes (Chukchi Peninsula, Russia): application to composition and evolution of mantle melts. Contrib Mineral Petrol 150, 85–101 (2005). https://doi.org/10.1007/s00410-005-0007-x

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