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American Mineralogist; October 2004; v. 89; no. 10; p. 1480-1485
© 2004 Mineralogical Society of America
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Phase transition of Ca-perovskite and stability of Al-bearing Mg-perovskite in the lower mantle

Shigeaki Ono1,*, Yasuo Ohishi2 and Kenji Mibe3

1 Institute for Frontier Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2–15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
2 Japan Synchrotron Radiation Research Institute, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan
3 Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, D.C. 20015, U.S.A.

Correspondence: * E-mail: sono{at}jamstec.go.jp

Here, using in situ X-ray diffraction combined with a laser-heated diamond anvil cell at high temperatures and high pressures, a phase relationship in KLB-1 peridotite composition samples was investigated from 38 to 106 GPa, and 300 to 2600 K, in order to determine the stability of phases in the lower mantle. We observed that Al-bearing Mg-perovskite and magnesiowüstite remained stable up to 106 GPa, which corresponds to a lower mantle depth of 2400 km depth. By contrast, a phase transition in Ca-perovskite from a cubic to a tetragonal structure was observed. The amount of distortion in this material increases as pressure increases at 300 K. The temperature of the tetragonal to cubic structure transition, therefore, appears to increase with increasing pressure. There is a possibility that this Ca-perovskite phase transition contributes to unidentified seismic anomalies in the lower mantle.




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