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Murakami et al. 2005

Murakami, M., Hirose, K., Sata, N. and Ohishi, Y. (2005). Post-perovskite phase transition and mineral chemistry in the pyrolitic lowermost mantle. Geophysical Research Letters 32: doi: 10.1029/2004GL021956. issn: 0094-8276.

Phase relations of a natural mantle composition were determined up to 126 GPa and 2450 K by in-situ x-ray diffraction measurements in a laser-heated diamond-anvil cell (LHDAC). MgSiO3-rich perovskite (MgPv) transforms to a post-perovskite phase (MgPP) at about 113 GPa and 2500 K (400-km above the core-mantle boundary) and the lowermost mantle consists of MgPP, (Mg, Fe)O magnesiow¿stite (Mw), and CaSiO3-rich perovskite (CaPv). Chemical analyses on recovered samples using transmission electron microscope (TEM) show that the distribution of iron significantly changes at the post-perovskite phase transition. A strong enrichment of iron in Mw leads to the unique geophysical and geochemical properties of the lowermost mantle.

BACKGROUND DATA FILES

	Abstract

Keywords
Mineral Physics, High-pressure behavior, Mineral Physics, X-ray, neutron, and electron spectroscopy and diffraction, Mineralogy and Petrology, Mineral and crystal chemistry, Mineralogy and Petrology, Experimental mineralogy and petrology

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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