Abstract
A point charge calculation of crystal fields results in electronic energy levels for Fe 2+ in various mantle minerals. Although the results are only semiquantitative, several important conclusions can be drawn. Between 650 and 1050 km, Fe 2+ should concentrate in Sr 2PbO 4 structures relative to ilmenite structures. Below 1050 km, Fe 2+ will either be spin paired in six coordinate sites of CaFe 2O 4 structure or be spin unpaired in the K 2NiF 4 structure. In the former case, Fe 2+ will concentrate downward at the 1050 km discontinuity but in the latter it may concentrate upward. Radiative transfer will be inhibited between 650 and 1050 km by absorption by Fe 2+ in the Sr 2PbO 4 structure. Below 1050 km, radiative transfer will be less inhibited if Fe 2+ is in K 2NiF 4 structure and not affected by Fe 2+ absorption if Fe 2+ is in CaFe 2O 4 structure.
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