Density of jadeite melts under high pressure and high temperature conditions

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4 Citations (Scopus)

Abstract

The density of the jadeite (NaAlSi2O6) melt has been measured up to 6.5 GPa and 2273 K using the X-ray absorption technique at beamline 13-BM-D of the Advanced Photon Source. A fit of the pressure-density- temperature data to the high temperature Birch-Murnaghan equation of state yielded the following thermoelastic parameters: density, p0 = 2.36 g/cm3, isothermal bulk modulus, KT0 = 21.5 ± 0.8 GPa, its pressure derivative, K0' = 8.9 ± 1.2, and the temperature derivative (∂KT/∂T)P = -0.0021 ± 0.0011 GPa/K at a reference temperature T0 = 1473 K. The densification of jadeite melt at low pressures is primarily dominated by topological changes in the structure, including a decrease in T-O-T angle and breaking and reforming of the T-O bond (T = Si4+, Al3+). Compressibilities of jadeite, albite, diopside, phonolite and peridotite melts display a systematic trend: the K0-K'0 plot of these silicate melts exhibits an inverse linear relation.

Original languageEnglish
Pages (from-to)300-307
Number of pages8
JournalJournal of Mineralogical and Petrological Sciences
Volume112
Issue number5
DOIs
Publication statusPublished - 2017 Oct 1

Keywords

  • Density
  • Equation of state
  • High pressure
  • Jadeite glass
  • Silicate melt
  • X-ray absorption method

ASJC Scopus subject areas

  • Geophysics
  • Geology

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