Ferric Iron in Lower Mantle Phases
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Experiments in the system MgO-FeO-SiO<SUB>2</SUB> have been the foundation of current beliefs that iron partitions preferentially into (Mg, Fe) O relative to the Mg-perovskite phase and occurs nearly all as Fe<SUP>2+</SUP>. Recent experiments in the system MgO-FeO-SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>, however, show that (1) the presence of small amounts of Al stabilises Fe<SUP>3+</SUP> in (Mg, Fe) SiO<SUB>3</SUB> perovskite to values exceeding 50% Fe<SUP>3+</SUP>/·Fe; and (2) the solubility of Fe<SUP>3+</SUP> in (Mg, Fe) O is extremely low at high P, T, regardless of oxygen fugacity. These results have important implications for physical and chemical properties of the lower mantle.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 62-65, 1998
The Japan Society of High Pressure Science and Technology