Mathematics – Logic
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..609k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, July 1989, p. 609-612. Research supported by NSF.
Mathematics
Logic
105
Chemical Reactions, Earth Core, Earth Mantle, Geochemistry, Iron, Silicates, Geomorphology, High Pressure, Liquid Metals, Perovskites, Stishovite
Scientific paper
Experiments with the laser-heated diamond cell show that (Mg,Fe)SiO3 perovskite reacts chemically with liquid iron at pressures greater than 70 GPa and temperatures above 3700 K. X-ray diffraction analyses of quenched samples demonstrate that the reaction products include SiO2 stishovite and the iron alloys (Fe,Mg)xO and Fe(x)Si(y) at the interface between the Fe and silicate. The results suggest that similar chemical reactions occur at the earth's core-mantle boundary, forming chemical heterogeneities composed of silicate-rich and iron alloy-rich regions in the D-double-prime layer. This scenario is consistent with seismological observations.
Jeanloz Raymond
Knittle Elise
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