Portal de Periódicos da CAPES

The Fe‐FeO buffer at lower mantle pressures and temperatures

1991; American Geophysical Union; Volume: 18; Issue: 7 Linguagem: Inglês

10.1029/91gl01583

1944-8007

L. M. Hirsch,

earthquake and tectonic studies

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 O 2 . At conditions corresponding to the coremantle boundary and 670 km depth, respectively, the oxygen fugacity of this buffer is 10 20 and 10³ Pa; oxygen activities referenced to these conditions are 10 −9 and 10 −13 .