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Journal of Volcanology and Seismology

, Volume 12, Issue 2, pp 140–149 | Cite as

The Effects of the Concentration of Olivine Xenocrysts on the Viscosity of Kimberlite Melts: Experimental Evidence

  • A. A. ChepurovEmail author
  • V. M. Sonin
  • A. I. Chepurov
  • A. A. Tomilenko
Article
  • 31 Downloads

Abstract

The study of viscosity in sub-liquidus heterogeneous media, which includes kimberlite magma at the pressures and temperatures that prevail in the mantle, is an urgent task. We have conducted experiments in the serpentine–olivine, serpentine–CaCO3‒olivine, and native kimberlite–olivine systems at a pressure of 4 GPa and temperatures of 1400‒1600°С in a BARS high-pressure device using the technique of a falling Pt pellet. The samples were examined after experiments to find fine-grained chilled mass of crystals where the Pt pellet was observed at the time of chilling. The concentration of the solid phase was varied in the experiments between 10 and 50 wt %. We showed that when 50 wt % of olivine grains has been introduced, it was not possible to detect the motion of the Pt pellet, while when the concentration of olivine xenocrysts reached 10 wt %, the Pt pellet very rapidly descended to the bottom of the reaction volume. Viscosity was calculated using the Stokes method. We found that the viscosity of a homogeneous kimberlite melt at 4 GPa and 1600°С is below 2 Pa s, with the viscosity of a melt that contained up to 10 wt % of the solid phase being approximately constant. A kimberlite melt that contained 30 wt % of the solid phase had a viscosity on the order of 100 Pa s, while with 50 wt % of the solid phase the relative viscosity of an ultrabasic system increased to reach values over 1000 Pa s.

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • A. A. Chepurov
    • 1
    Email author
  • V. M. Sonin
    • 1
  • A. I. Chepurov
    • 1
  • A. A. Tomilenko
    • 1
  1. 1.Institute of Geology and Mineralogy, Siberian BranchRussian Academy of SciencesNovosibirskRussia

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