RT Journal Article
SR Electronic
T1 The viscosity of magmatic silicate liquids; a model calculation
JF American Journal of Science
JO Am J Sci
FD American Journal of Science
SP 438
OP 475
DO 10.2475/ajs.272.5.438
VO 272
IS 5
A1 Bottinga, Yan
A1 Weill, Daniel F.
YR 1972
UL http://www.ajsonline.org/content/272/5/438.abstract
AB The composition dependence of viscosity in binary silicate liquids is approximated by a linear equation of the form ln h = Si Xi Di, where h is the Newtonian viscosity coefficient, Xi is the mole fraction of oxide component i, and Di is an empirical constant associated component i over a restricted range of SiO 2 concentration. This relation has been extended to multicomponent silicate liquid systems, and a preferred set of viscosity measurements (2440 data points) has been used to evaluate Di constants at 50 degrees C intervals over the temperature range 1200 degrees to 1800 degrees C. Di values for the components SiO 2 , TiO 2 , FeO, MnO, MgO, CaO, SrO, BaO, Li 2 O, Na 2 O, K 2 O. KAlO 2 , NaAlO 2 , BaAl 2 O 4 , CaAl 2 O 4 , MgAl 2 O 4 , and MnAl 2 O 4 are given for mole fraction SiO 2 intervals 0.35 to 0.45, 0.45 to 0.55, 0.55 to 0.65, 0.65 to 0.75, and 0.75 to 0.81. The model may be used to calculate the viscosities of many natural magmatic liquids. A comparison of calculated viscosities with all the published data for molten rock and mineral systems shows a very satisfactory agreement over a range of viscosities from approximately 1 to 106 poises.