The Fe-FeO buffer at lower mantle pressures and temperatures

As a constraint on oxygen fugacity of the lower mantle, the iron‐wüstite (IW) oxygen buffer has been calculated for temperatures to 3000 K and pressures to 135 GPa using available thermochemical and thermophysical data for Fe, FeO, and O2. At conditions corresponding to the coremantle boundary and 6...

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Veröffentlicht in:	Geophysical research letters 1991-07, Vol.18 (7), p.1309-1312
1. Verfasser:	Hirsch, L. M.
Format:	Artikel
Sprache:	eng
Schlagworte:	360606 - Other Materials- Physical Properties- (1992-) 580000 - Geosciences Boundaries Buffers CALCULATION METHODS CHALCOGENIDES DEPTH DIMENSIONS EARTH CORE EARTH MANTLE ELEMENTS Fugacity Geophysics GEOSCIENCES INTERFACES Iron IRON COMPOUNDS IRON OXIDES Mantle MATERIALS SCIENCE Mathematical analysis NONMETALS OXIDES OXYGEN OXYGEN COMPOUNDS PHYSICAL PROPERTIES TEMPERATURE RANGE TEMPERATURE RANGE 1000-4000 K THERMODYNAMIC PROPERTIES Thermophysical TRANSITION ELEMENT COMPOUNDS VAPOR PRESSURE VERY HIGH PRESSURE
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Beschreibung
Zusammenfassung:	As a constraint on oxygen fugacity of the lower mantle, the iron‐wüstite (IW) oxygen buffer has been calculated for temperatures to 3000 K and pressures to 135 GPa using available thermochemical and thermophysical data for Fe, FeO, and O2. At conditions corresponding to the coremantle boundary and 670 km depth, respectively, the oxygen fugacity of this buffer is 1020 and 10³ Pa; oxygen activities referenced to these conditions are 10−9 and 10−13.
ISSN:	0094-8276 1944-8007
DOI:	10.1029/91GL01583