Pressure and temperature dependence of the viscosity of a NaAlSi2O6 melt

Akio Suzuki, Eiji Ohtani, Hidenori Terasaki, Keisuke Nishida, Hiromi Hayashi, Tatsuya Sakamaki, Yuki Shibazaki, Takumi Kikegawa

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The viscosity of a silicate melt of composition NaAlSi2O6 was measured at pressures from 1.6 to 5.5 GPa and at temperatures from 1,350 to 1,880°C. We employed in situ falling sphere viscometry using X-ray radiography. We found that the viscosity of the NaAlSi2O6 melt decreased with increasing pressure up to 2 GPa. The pressure dependence of viscosity is diminished above 2 GPa. By using the relationship between the logarithm of viscosity and the reciprocal temperature, the activation energies for viscous flow were calculated to be 3.7 ± 0.4 × 102 and 3.7 ± 0.5 × 102 kJ/mol at 2.2 and 2.9 GPa, respectively.

Original languageEnglish
Pages (from-to)59-64
Number of pages6
JournalPhysics and Chemistry of Minerals
Volume38
Issue number1
DOIs
Publication statusPublished - 2011

Keywords

  • High pressure
  • Radiography
  • Silicate melt
  • Viscosity

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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