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The partitioning of Fe and Mg between garnet coexisting with olivine, wadsleyite, ringwoodite and magnesiowüstite solid solutions has been measured between 9 and 19 GPa and 1400-1700 ℃. In addition to studying exchange reactions involving the pyrope-almandine garnet solid solution, majoritic garnets forming in a natural peridotite bulk composition have been also examined. Metallic Fe was added to all bulk compositions to buffer the Fe 3+  concentration at its lowest possible level. Partitioning data between pyrope-almandine garnet and ringwoodite were combined with data for garnet-magnesiowüstite and ringwoodite-magnesiowüstite partitioning to refine thermodynamic mixing properties for these solid solutions at 18 GPa and 1400 ℃. A multiple non-linear regression employing cation exchange data between these 3 solid solutions yielded the following well-constrained values for the differences in symmetric solid-solution interaction parameters: W mw  FeMg  - W ring  FeMg  = 8.8(2) kJ/mol, W mw  FeMg  - W gt  FeMg  = 12.8(5) kJ/mol,W ring  FeMg  - W gt  FeMg  = 4.0(4) kJ/mol.

Fe 2+ -Mg partitioning between garnet, magnesiowüstite, and (Mg,Fe) 2 SiO 4 phases of the transition zone