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The bulk modulus ‐ attenuation ‐ viscosity systematics of diopside‐anorthite melts
Author(s) -
Secco R. A.,
Manghnani M. H.,
Liu T.C.
Publication year - 1991
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/90gl01711
Subject(s) - diopside , liquidus , thermodynamics , atmospheric temperature range , activation energy , arrhenius equation , bulk modulus , materials science , viscosity , anorthite , shear modulus , mineralogy , analytical chemistry (journal) , chemistry , physics , composite material , alloy , chromatography
Ultrasonic measurements of Q p −1 and V p for An and Di .64 An .36 melts are reported in the frequency range 3 – 20 MHz and in the temperature range from melting to 1934K and 1831K5 respectively. When Q p −1 and shear viscosity are normalized to their respective liquidus temperature values, they have the same linear dependence on reciprocal homologous temperature. From the Arrhenius temperature dependence of Q p −1 , the activation energies calculated for An and Di .64 An .36 melts are on the order of 216 and 302 kJ/mol, respectively. Although there is insufficient data for An, the activation energy of Q p −1 for Di .64 An .36 is in excellent agreement with its activation energy of viscosity. The relaxed adiabatic bulk modulus, derived from relaxed velocities, for An at 1893K is 20.4 ± 0.2 GPa and for Di .64 An .36 at 1677K is 23.0 ± 0.1 GPa. These values fall into a general trend of decreasing bulk modulus with increasing Al 2 O 3 .