Viscosity of albite melt at high pressure and high temperature

A. Suzuki, E. Ohtani, K. Funakoshi, H. Terasaki, T. Kubo

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

The viscosity of albite (NaAlSi3O8) melt was measured at high pressure by the in situ falling-sphere method using a high-resolution X-ray CCD camera and a large-volume multianvil apparatus installed at SPring-8. This system enabled us to conduct in situ viscosity measurements more accurately than that using the conventional technique at pressures of up to several gigapascals and viscosity in the order of 100 Pa s. The viscosity of albite melt is 5.8 Pa s at 2.6 GPa and 2.2 Pa s at 5.3 GPa and 1973 K. Experiments at 1873 and 1973 K show that the decrease in viscosity continues to 5.3 GPa. The activation energy for viscosity is estimated to be 316(8) kJ mol-1 at 3.3 GPa. Molecular dynamics simulations suggest that a gradual decrease in viscosity of albite melt at high pressure may be explained by structural changes such as an increase in the coordination number of aluminum in the melt.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalPhysics and Chemistry of Minerals
Volume29
Issue number3
DOIs
Publication statusPublished - 2002 May 21

Keywords

  • High pressure
  • Magma
  • Molecular simulation
  • Silicate melt
  • Viscosity

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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