Open AccessThermal diffusivity of olivine under upper mantle conditions
Author(s) -
Katsura Tomoo
Publication year - 1995
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1995.tb03536.x
Subject(s) - thermal diffusivity , olivine , mantle (geology) , thermodynamics , radiative transfer , thermal , geology , materials science , mineralogy , geophysics , physics , optics
SUMMARY Thermal diffusivity of olivine with (Mg 0.89 Fe 0.11 ) 2 SiO 4 composition is measured at pressures up to 9 GPa and temperatures up to 1700 K using the Ångström method in a cylindrical geometry. The experimental results demonstrate that lattice thermal diffusivity increases with increasing pressure at a small rate: 46 per cent increase over 10 GPa. The experimental data also suggest that radiative thermal diffusivity may decrease with increasing pressure. Thermal diffusivity in the upper mantle has almost constant values of 7–8 × 10 −7 m 2 s −1 .