Ferromagnesian postperovskite silicates in the D'' layer of the Earth

Details Ferromagnesian postperovskite silicates in the D'' layer of the Earth Ferromagnesian postperovskite silicates in the D'' layer of the Earth

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pnas..10115867m&link_type=abstract

Proceedings of the National Academy of Science, vol. 101, Issue 45, p.15867-15869

Computer Science

56

Scientific paper

Natural olivine with 12 mol % Fe2SiO4 and synthetic orthopyroxenes with 20% and 40% FeSiO3 were studied beyond the pressure-temperature conditions of the core-mantle boundary. All samples were found to convert entirely or partially into the CaIrO3 postperovskite structure, which was recently reported for pure MgSiO3. The incorporation of Fe greatly reduces the pressure needed for the transition and establishes the new phase as the major component of the D'' layer. With the liquid core as an unlimited reservoir of iron, core-mantle reactions could further enrich the iron content in this phase and explain the intriguing seismic signatures observed in the D'' layer.

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