Mathematics – Logic
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p21b0531j&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P21B-0531
Mathematics
Logic
0350 Pressure, Density, And Temperature, 3672 Planetary Mineralogy And Petrology (5410), 3939 Physical Thermodynamics, 3949 Thermal Expansivity, 3999 General Or Miscellaneous
Scientific paper
Accurate material properties are essential for geodynamic model calculations and for the interpretation of seismological observations. For this reason phase transitions in earth materials must be accurately known. In mantle mineralogy, the problem exists on the exact location of the phase boundary between ringwoodite and magnesiowustite + perovkite. For instance the measurements of Irifune et al. (1998), Science 279, 1698-1700 indicate that the ringwoodite - perovskite + magnesiowüstite transition is associated with a depth of 600 km in the earth. Chudinovskikh and Boehler (2001), Nature, 411, 574-577, conclude from their measurements that the transition is associated with a depth of 660 km in the earth. As has been stated by Bina (2001), Nature, 411, 536-537, the problem arises from the equation of state used for pressure calibration in the experiments. We have carried out thermodynamic analyses of the Mg2SiO4 and Fe2SiO4 polymorphs (Jacobs and Oonk (2001), Phys. Chem. Mineral. 269, in press., Jacobs, Oonk and de Jong (2001), Geochim. Cosmochim. Acta, in press) resulting in accurate material properties as a function of pressure, temperature and composition for olivine, wadsleyite and ringwoodite. Using all available experimental P-V-T data and calorimetric data, we show that the transition between ringwoodite and magnesiowustite + perovkite is most likely associated with a depth of 660 km in the earth.
de Jong B. H.
Jacobs M. H.
van den Berg Arie P.
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