A convenient method for measuring ferric iron in magnesiowustite (MgO-Fe (sub 1-x) O)

1998/08/01 by David P. Dobson, D. P. Dobson, Neil S. Cohen +2 · 3 citations
Energy · Earth and Planetary Sciences · Computer Science · #Iron oxide chemistry and applications #Geophysical and Geoelectrical Methods #Geochemistry and Geologic Mapping

paper · pdf · doi:10.2138/am-1998-7-811

Abstract

We present a new oxybarometer for magnesiowu stite-bearing systems, which is easily applied using widely available techniques. A scale relating the proportion of Fe 3 [ Fe 3 /(Fe 3 Fe 2 )] to the position of the (220) reflection and total Fe (y) in magnesiowu stites (Mg 1y Fe y ) 1x O has been derived from measured values in samples equilibrated at various oxygen fugacities: 2 3 13.0047 39.4829f 40.0540f 13.5701f (0.007 0.09), 2 f (d 1.4890)/(0.0510y 0.0206y )(0.0001). 220

Cited by

• High-pressure phase relations in the Mg–Fe–O system and the conditions at which ferropericlase inclusions in diamonds are formed
• The magnesiow�stite: iron equilibrium and its implications for the activity-composition relations of (Mg,Fe)2SiO4 olivine solid solutions
• Subduction-related oxidation of the sublithospheric mantle evidenced by ferropericlase and magnesiowüstite diamond inclusions. [europepmc]

Related

• Synthesis and crystal structure of Mg-bearing Fe9O11: New insight in the complexity of Fe-Mg oxides at conditions of the deep upper mantle
• Geothermometry and oxygen barometry using coexisting iron-titanium oxides: a reappraisal
• Compressibilities along the magnetite–magnesioferrite solid solution
• The periclase -wüstite stability field and the exsolution of coherent nano-crystalline spinel ferrite at one atmosphere
• Oxybarometry of reduced silicate glasses: Using multivariate methods to constrain Cr oxidation states with application to lunar glasses