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Science 21 July 2000:
Vol. 289. no. 5478, pp. 430 - 432
DOI: 10.1126/science.289.5478.430
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Reports
Stability of Ferropericlase in the Lower Mantle
L. S. Dubrovinsky,1*
N. A. Dubrovinskaia,1
S. K. Saxena,1
H. Annersten,1
E. Hålenius,1
H. Harryson,1
F. Tutti,1
S. Rekhi,1
T. Le Bihan2
We have heated ferropericlases
(Mg0.60Fe0.40)O and
(Mg0.50Fe0.50)O to temperatures of 1000 kelvin
at pressures of 86 gigapascals, simulating the stability of the solid
solution at physical conditions relevant to Earth's lower mantle. The
in situ x-ray study of the externally heated samples in a
Mao-Bell-type diamond anvil cell shows that ferropericlase may
dissociate into magnesium-rich and iron-rich oxide components. The
result is important because the decomposition of ferropericlase into
lighter and heavier phases will cause dynamic effects that could lead
to mantle heterogeneity.
1 Institute of Earth Sciences, Uppsala
University, S-752 36 Uppsala, Sweden.
2 European Synchrotron Radiation Facility (ESRF), BP
220, F-38043 Grenoble Cedex, France.
*
To whom correspondence should be addressed.
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