Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1347c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Nov. 1989, p. 1347-1350.
Physics
123
Chemical Composition, Earth Mantle, High Pressure, Thermal Expansion, Laser Heating, Magnesium Oxides, Perovskites, Wurtzite
Scientific paper
New data on thermal expansivity, alpha, of iron to over 400 kbar in laser- and electrically-heated diamond anvil cells and on MgO and forsterite from spectroscopic data to over 200 kbar and previously measured adiabats (Boehler, 1982), imply that alpha at high pressure may be described by a constant value of 5.5 + or - 0.5. This behavior is supported by previous alpha measurements at lower pressures on a large variety of materials. Densities of magnesio-wuestite and silicate perovskite in a pyrolitic ratio calculated at lower mantle conditions using a finite strain equation and alpha at high pressures, using the above systematics, match those in PREM through the entire lower mantle, making a strong case for a uniform mantle.
Boehler Reinhard
Chopelas A.
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