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New provisions for volcanogenic rocks in the Petrographic Code

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Abstract

Results are reported from recent developments relating to volcanic rocks; these were necessary in connection with an analysis of remarks and proposals for the 1995 Petrographic Code, as well as resulting from an analysis of practical applications of this document. The new materials are concerned with three directions: (1) further specification of the “total alkali-silica” diagram (TAS) for acidic rocks and trachytes; (2) improving the classification of clastic volcanogenic rocks and regulating the volcaniclastic terminology; and (3) substantiating the principles for subdividing sedimentary-and-volcanogenic rocks into subunits of different hierarchical levels and specifying the associated criteria. The insertion of results of these developments into a second, revised and supplemented edition of the Petrographic Code and their application to geological studies will enhance the quality of the latter.

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Authors and Affiliations

  1. Karpinsky All-Russia Geological Research Institute, St. Petersburg, 199106, Russia

    L. N. Sharpenok, E. A. Kukharenko & A. E. Kostin

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  1. L. N. Sharpenok
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  2. E. A. Kukharenko
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  3. A. E. Kostin
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Original Russian Text © L.N. Sharpenok, E.A. Kukharenko, A.E. Kostin, 2009, published in Vulkanologiya i Seismologiya, 2009, No. 4, pp. 64–80.

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Sharpenok, L.N., Kukharenko, E.A. & Kostin, A.E. New provisions for volcanogenic rocks in the Petrographic Code. J. Volcanolog. Seismol. 3, 279–293 (2009). https://doi.org/10.1134/S0742046309040058

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  • DOI: https://doi.org/10.1134/S0742046309040058

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