Abstract
Mg‐Fe partitioning between coexisting phases, magnesiowüstite (Mw) and olivine (α), Mw and β‐phase, Mw and spinel (γ), and Mw and perovskite (Pv), has been determined experimentally with piston‐cylinder apparatus, the multianvil device and the diamond anvil cell technique at pressures between 2 and 28 GPa and temperatures between 1473 and 1773 K. The solution parameters of each solid solution were obtained by fitting the experimental data simultaneously using the Margules formulation. The optimized solution parameters (in J/mol) are WMwMg‐Fe = 16100, WMwFe‐Mg = 26300 − 5.56T; WαMg‐Fe = 4500 + 130P, WαFe‐Mg = 6500 + 130P; WβMg‐Fe = 1000, WβFe‐Mg = 2000; WγMg‐Fe = 900 − 1.10T WγFe‐Mg = 3900; and WPvMg‐Fe = 4130 −1.37T + 110P, WPvFe‐Mg = −4050 − 2.45T + 150 P where P is in GPa and T in K. These parameters are consistent with solution calorimetry and phase equilibrium data. Phase relations in the MgO‐FeO‐SiO2 system were calculated by using the Margules solution model combined with internally consistent thermodynamic data of the pure phases. The computation provides independent constraints for phase relations in the system, in addition to those directly determined in P‐T‐Xi space.
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Dates
Type | When |
---|---|
Created | 17 years, 6 months ago (Feb. 6, 2008, 10:46 a.m.) |
Deposited | 1 year, 11 months ago (Sept. 22, 2023, 2:42 p.m.) |
Indexed | 2 months ago (June 25, 2025, 3:25 p.m.) |
Issued | 34 years, 6 months ago (Feb. 10, 1991) |
Published | 34 years, 6 months ago (Feb. 10, 1991) |
Published Online | 12 years, 11 months ago (Sept. 20, 2012) |
Published Print | 34 years, 6 months ago (Feb. 10, 1991) |
@article{Fei_1991, title={Experimental determination of element partitioning and calculation of phase relations in the MgO‐FeO‐SiO2 system at high pressure and high temperature}, volume={96}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/90jb02164}, DOI={10.1029/90jb02164}, number={B2}, journal={Journal of Geophysical Research: Solid Earth}, publisher={American Geophysical Union (AGU)}, author={Fei, Yingwei and Mao, Ho‐Kwang and Mysen, Bjorn O.}, year={1991}, month=feb, pages={2157–2169} }