Computer Science
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.193...57b&link_type=abstract
Earth and Planetary Science Letters, Volume 193, Issue 1-2, p. 57-68.
Computer Science
10
Scientific paper
A potassium silicate liquid with 56.9 mol% SiO2 (KS1.3) has been used as a model system to determine at 1 bar the influence of carbon dioxide on the viscosity and density of magma. For the maximum concentration of 3.5 wt% that could be dissolved, the viscosity decreases by two orders of magnitude near the glass transition at around 750 K. For 1 wt% CO2, the decrease is 1 and only 0.04 log unit at 750 and 1500 K, respectively. Dissolved CO2 has a composition independent partial molar volume of 25.6+/-0.8 cm3/mol in glasses at room temperature, and does not affect the thermal expansion coefficient of the supercooled liquid which is (12.3+/-0.3)×10-5 K-1 for CO2 contents varying from 0.6 to 2.2 wt%. Qualitatively, these effects are similar to those of water. However, the density of dissolved CO2 varies from about 1.7 to 1.5 g/cm3 in a 700 K interval above the glass transition, and lowers the density of the glass less than water whose density decreases from 1.5 to 1.2 g/cm3 under the same conditions. The relevance of these results to natural magma is finally pointed out.
Bourgue Emmanuelle
Richet Pascal
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