Crossref journal-article
American Geophysical Union (AGU)
Journal of Geophysical Research: Solid Earth (13)
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.

Bibliography

Fei, Y., Mao, H., & Mysen, B. O. (1991). Experimental determination of element partitioning and calculation of phase relations in the MgO‐FeO‐SiO2 system at high pressure and high temperature. Journal of Geophysical Research: Solid Earth, 96(B2), 2157–2169. Portico.

Authors 3
  1. Yingwei Fei (first)
  2. Ho‐Kwang Mao (additional)
  3. Bjorn O. Mysen (additional)
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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)
Funders 0

None

@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} }