Viscosity of silicate melts in CaMgSi2O6- NaAlSi2O6 system at high pressure

Akio Suzuki, Eiji Ohtani, Hidenori Terasaki, Ken Ichi Funakoshi

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


In situ X-ray viscometry of the silicate melts was carried out at high pressure and at high temperature. The viscosity of the silicate melts in the diopside(Di)-jadeite(Jd) system was determined in the pressure range from 1.88 GPa to 7.9 GPa and in the temperature range from 2,003 K to 2,173 K. The viscosity of the Di 25%-Jd 75% melt decreases continuously to 5.0 GPa, whereas the viscosity of the Di 50%-Jd 50% melt increases over 3.5 GPa. The viscosity of the Di50%-Jd 50% melt reaches a minimum around 3.5 GPa. Since the amounts of silicon in the two melts are the same, the difference in the pressure dependence of the viscosity may be controlled by another network-forming element, i.e., aluminum. The difference in the pressure dependence of the viscosities in the melts with two intermediate compositions in the Di-Jd system is estimated to be due to the difference in the melt structures at high pressures and high temperatures.

Original languageEnglish
Pages (from-to)140-145
Number of pages6
JournalPhysics and Chemistry of Minerals
Issue number2
Publication statusPublished - Jun 2005
Externally publishedYes


  • High-pressure
  • Magma
  • Radiography
  • Silicate melt
  • Viscosity

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology


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