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Fluid–Silicate Separation of an Ultrabasic Melt into High-Potassium and Low-Potassium Fractions: Evidence from Picrites of the Late Cretaceous Ultrabasic Volcanic Complex, Eastern Kamchatka

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Abstract

The mineral and chemical compositions of the layered subvolcanic ultrabasic rocks formed through fluid–silicate (liquid) separation of the ultrabasic magma into high-potassium and low-potassium fractions are characterized by the example of the layered picritic sill from the Late Cretaceous ultrabasic volcanic complex of Eastern Kamchatka. It is determined that the main potassium concentrator in the picrites from the high-potassium layers is a residual volcanic glass containing up to 8–9 wt % K2O, which is unique for ultrabasic melts.

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ACKNOWLEDGMENTS

This work was supported by the Far East Branch of the Russian Academy of Sciences (project no. 15-1-2-053).

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Authors and Affiliations

  1. Far East Geological Institute (DVGI), Far East Branch, Russian Academy of Sciences, 660022, Vladivostok, Russia

    Z. G. Badredinov, I. A. Tararin & N. I. Ekimova

  2. Karpinskii All Russia Research Geological Institute (VSEGEI), 199106, St. Petersburg, Russia

    B. A. Markovsky

  3. Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, 683006, Petropavlovsk-Kamchatsky, Russia

    V. M. Chubarov

Authors
  1. Z. G. Badredinov
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  2. B. A. Markovsky
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  3. I. A. Tararin
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  4. N. I. Ekimova
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  5. V. M. Chubarov
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Corresponding authors

Correspondence to Z. G. Badredinov or V. M. Chubarov.

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Recommended for publishing by A.V. Koloskov

Translated by M. Bogina

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Badredinov, Z.G., Markovsky, B.A., Tararin, I.A. et al. Fluid–Silicate Separation of an Ultrabasic Melt into High-Potassium and Low-Potassium Fractions: Evidence from Picrites of the Late Cretaceous Ultrabasic Volcanic Complex, Eastern Kamchatka. Russ. J. of Pac. Geol. 12, 408–418 (2018). https://doi.org/10.1134/S1819714018050032

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  • DOI: https://doi.org/10.1134/S1819714018050032

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