Computer Science
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.4645k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 22, pp.4645-4652
Computer Science
10
Scientific paper
The densities and thermal expansivities of thirty-eight haplogranitic silicate melts have been experimentally determined. The compositions represent the additions of approximately 5, 10, and 20 wt% of selected oxide components Al 2 O 3 , Na 2 O, K 2 O, Li 2 O, Rb 2 O, Cs 2 O, MgO, CaO, SrO, BaO, TiO 2 , Nb 2 O 5 , Ta 2 O 5 , and WO 3 to a base melt of haplogranitic (HPG8) composition. The densities of melts have been obtained by a combination of scanning dilatometry and room temperature Archimedean density determinations together with scanning calorimetry. The thermal expansivities were obtained by a combination of scanning calorimetry and scanning dilatometry. The results of the density and expansivity determinations for the melts are fit to a multicomponent linear least squares regression of molar volume vs. molar composition. The resulting partial molar volumes of the molten oxides are reported for a reference temperature of 750°C. The multicomponent linear least squares regression yields a description of the database with a root mean squared deviation of 0.3%. The fit to these new partial molar volume data includes our previous data for B 2 O 3 , P 2 O 5 , and F 2 O -1 -bearing haplogranitic melts. The partial molar volumes of the oxides vary from 10.53 ± 0.29 cm 3 mole -1 for MgO to 69.09 ± 1.82 cm 3 mol -1 for P 2 O 5 . Compared on the basis of one oxygen per mole they range from 10.53 ± 0.29 cm 3 mol -1 (MgO) to 55.38 ± 1.69 cm 3 mol -1 (Cs 2 O). The present data, taken together with an estimate of the partial molar volume of water in these melts (13.1 ± 1.3 cm 3 mol -1 ) are recommended to be used to calculate the low pressure densities of leucogranitic and pegmatitic melts.
Dingwell Donald B.
Knoche Richard
Webb Sharon L.
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Melt densities for leucogranites and granitic pegmatites: Partial molar volumes for SiO 2 , Al 2 O 3 , Na 2 O, K 2 O, Li 2 O, Rb 2 O, Cs 2 O, MgO, CaO, SrO, BaO, B 2 O 3 , P 2 O 5 , F 2 O -1 , TiO 2 , Nb 2 O 5 , Ta 2 O 5 , and WO 3 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
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