Viscosity of melt of soda melilite composition at high pressure

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Abstract

The viscosity of melt of soda melilite (CaNaAlSi 2 O 7 ) composition was measured using the falling sphere method with synchrotron X-ray radiography. This composition of melt was used as a model basalt, because the ratio of the non-bridging oxygen (NBO) and the tetrahedrally coordinated (T) cation is 0.67. We observed a viscosity minimum between 2 and 4 GPa. This finding shows that the partially depolymerized melt (NBO/T = 0.67) has a viscosity minimum under high pressure.

Original languageEnglish
Pages (from-to)41-44
Number of pages4
JournalJournal of Mineralogical and Petrological Sciences
Volume114
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Aluminosilicate melt
  • Magma
  • Soda melilite
  • Viscosity
  • X-ray radiography

ASJC Scopus subject areas

  • Geophysics
  • Geology

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