Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3219301k&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 19, CiteID L19301
Physics
31
Geochemistry: Composition Of The Mantle, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior
Scientific paper
We report here new data on pressure dependence of Fe-Mg partitioning between (Mg, Fe)SiO3 perovskite (Pv) and magnesiowüstite (Mw), KPv/Mw, and (Mg, Fe)SiO3 post-perovskite (PPv) and Mw, KPPv/Mw, up to 123.6 GPa at 1600 K measured by synchrotron X-ray diffraction method and analytical transmission electron microscopy (ATEM). We observed a high FeO content in PPv coexisting with Mw [KPPv/Mw = (FeO/MgO)PPv/(FeO/MgO)Mw = 0.30] compared to that in Pv [KPv/Mw = (FeO/MgO)Pv/(FeO/MgO)Mw = 0.12] observed from 23.0 to 95.4 GPa. KPv/Mw keeps a constant value of 0.12 up to the PPv phase boundary. Our results also support the possibility that a metallic phase may form in the lower mantle. The assemblage of PPv and Mw is 1.5-1.7% denser than the Pv bearing assemblage, which results in a gravitational stabilization of the lowermost mantle.
Hirao Naohisa
Kikegawa Takumi
Kobayashi Yusuke
Kondo Tadashi
Miyajima Nobuyoshi
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