Silicon and oxygen self-diffusivities in silicate liquids measured to 15 gigapascals and 2800 Kelvin

Brent T. Poe, Paul F. McMillan, David C. Rubie, Sumit Chakraborty, Jeffery Yarger, Jason Diefenbacher

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167 Scopus citations

Abstract

Mass transport properties of silicate liquids exhibit complex behavior as a function of pressure, as the tetrahedral framework structure of the liquid shifts to a more compact arrangement of atoms. For highly polymerized aluminosilicate liquids, oxygen diffusivities pass through a maximum at pressures below 10 gigapascals, whereas up to 15 gigapascals diffusivities continue to increase for sodium tetrasilicate liquid. A diffusivity maximum indicates a change in the mechanism of formation of 5-coordinated silicon or aluminum in the liquid. In the case of aluminosilicate liquids, this mechanism is restricted to aluminum sites in the network, suggesting that not only degree of polymerization, but also the ratio of aluminum to aluminum plus silicon strongly influences the behavior of magmatic processes at depth.

Original languageEnglish (US)
Pages (from-to)1245-1248
Number of pages4
JournalScience
Volume276
Issue number5316
DOIs
StatePublished - May 23 1997

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    Poe, B. T., McMillan, P. F., Rubie, D. C., Chakraborty, S., Yarger, J., & Diefenbacher, J. (1997). Silicon and oxygen self-diffusivities in silicate liquids measured to 15 gigapascals and 2800 Kelvin. Science, 276(5316), 1245-1248. https://doi.org/10.1126/science.276.5316.1245