Abstract
Constraining the spin state of Fe in Earth’s lower mantle is critical to understanding the chemistry and dynamics of Earth’s interior. In the October 2015 issue of American Mineralogist , Dorfman et al. present an experimental study of the effect of iron concentration on the spin transition in bridgmanite. Their experiments involved two different bridgmanite compositions (38 and 74% FeSiO 3 ). Based on the total spin moment determined by synchrotron-based X-ray emission spectroscopy, they show that Fe 2+ in bridgmanite is in the high-spin state in the lower mantle but transition pressure decreases within highly enriched iron concentrations.
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