Adiabats of quartz, coesite, olivine, and magnesium oxide to 50 kbar and 1000 K, and the adiabatic gradient in the earth's mantle
The adiabats of olivine, magnesium oxide, and quartz were measured up to 50 kbar and 1000 K. An end-loaded piston-cylinder apparatus with an in situ pressure gauge and a very fine thermocouple was used to measure (partialT/partialP)/sub s/, during adiabatic compression. A power law between (partialT/partialP)/sub s/ and compression yields values of the power n = -partial ln(partialT/partialP)/sub s//partial ln rho that agree with previous results from salts, metals, and fluids. Assuming constant values for n, the adiabatic gradient for an olivine upper mantle and a magnesium oxide lower mantle was calculated. The results agree well with some previous theoretical estimates. The volume dependence of the Grueneisen parameter ..gamma.. was calculated from the thermodynamic equation partialln ..gamma../partial ln rho = partialB/partialP-n, where B is the isothermal bulk modulus, ..gamma.. is found to a good approximation to be proportional to volume.
- Research Organization:
- Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90024
- OSTI ID:
- 6396304
- Journal Information:
- J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 87:B7; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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ADIABATIC PROCESSES
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COESITE
EARTH MANTLE
GEOBAROMETRY
IRON COMPOUNDS
IRON SILICATES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNESIUM SILICATES
MINERALS
OLIVINE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
QUARTZ
SILICA
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
TEMPERATURE MEASUREMENT
TRANSITION ELEMENT COMPOUNDS