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Journal of Volcanology and Seismology

, Volume 7, Issue 2, pp 145–169 | Cite as

The evolutionary stages and petrology of the kekuknai volcanic massif reflecting the magmatism in the backarc zone of the kuril-kamchatka island arc system. Part II. petrologic and mineralogical features, petrogenesis model

  • A. V. KoloskovEmail author
  • G. B. Flerov
  • A. B. Perepelov
  • I. V. Melekestsev
  • M. Yu. Puzankov
  • T. M. Filosofova
Article

Abstract

The Kekuknai massif was formed in the course of tectono-magmatic activity that involved the origin of a shield volcano and a caldera depression with associated emplacement of extrusions that terminated in intense post-caldera areal volcanism. The mineralogical compositions of the massif’s rocks have been considered in detail. The use of previously known and newly developed indicator properties of rock-forming minerals allowed the reconstruction of the general picture of the magmatic melt evolution and conditions of rock crystallization (various fluid and water saturation levels, as well as the oxidation state of the system). Essentially island-arc or intraplate characteristics of the massif’s rock compositions are found at different stages of development of a single fluid-magmatic system. Decompression evolution of the parent deep-seated basanitic magma occurred via occurrence in intermediate magma chambers of daughter magmas of trachybasalt (pre-caldera stage) or hawaiite (areal volcanism) composition. Subsequent emanate-magmatic differentiation of these melts, combined with crystallization differentiation under changing P-T-conditions, resulted in the formation of the entire diversity of the Kekuknai rocks.

Keywords

Olivine Andesite Basalt Cinder Cone Plagioclase Composition High Oxygen Fugacity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • A. V. Koloskov
    • 1
    Email author
  • G. B. Flerov
    • 1
  • A. B. Perepelov
    • 2
  • I. V. Melekestsev
    • 1
  • M. Yu. Puzankov
    • 1
  • T. M. Filosofova
    • 1
  1. 1.Institute of Volcanology and Seismology, Far East BranchRussian Academy of SciencesPetropavlovsk-KamchatskiiRussia
  2. 2.Vinogradov Institute of Geochemistry, Siberian BranchRussian Academy of SciencesIrkutskRussia

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