Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition
-
Kristina Lilova
, Michael T. DeAngelis , Lawrence M. Anovitz and Alexandra Navrotsky
Abstract
The surface energy (hydrated surfaces) of fayalite (α-Fe2SiO4) was determined to be 2.47 ± 0.25 J/m2 using high-temperature oxide melt solution calorimetry. This is larger than the surface energy of magnetite (Fe3O4), but lower than that of forsterite (α-Mg2SiO4). The changes in the positions of the quartz-fayalite-magnetite (QFM) and quartz-iron-fayalite (QIF) buffers with particle size reduction were calculated. QFM is lowered in fO2 by 3–7 log units as a function of temperature for 30 nm particles while QIF is raised by 1–2 log units. The estimated surface energy difference between olivine and spinel polymorphs decreases the pressure of the olivine-spinel transition in Fe2SiO4 by about 1 GPa.
Acknowledgments
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division (calorimetry at U.C. Davis was supported under Award number DE-FG02ER1474). Work by M.T.D. was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The authors thank D.H. Lindsley for careful synthesis of the bulk 5-15-17 fayalite sample.
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Articles in the same Issue
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- In-situ dating of metamorphism in Adirondack anorthosite
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- Letter
- Fe-Ni ideality during core formation on Earth
- New Mineral Names
Articles in the same Issue
- Highlights and Breakthroughs
- A closer look at shocked meteorites: Discovery of new high-pressure minerals
- In-situ dating of metamorphism in Adirondack anorthosite
- A new style of rare metal granite with Nb-rich mica: The Early Cretaceous Huangshan rare-metal granite suite, northeast Jiangxi Province, southeast China
- Tectonic controls on Ni and Cu contents of primary mantle-derived magmas for the formation of magmatic sulfide deposits
- The high-pressure anisotropic thermoelastic properties of a potential inner core carbon-bearing phase, Fe7C3, by single-crystal X-ray diffraction
- Eruption triggering by partial crystallization of mafic enclaves at Chaos Crags, Lassen Volcanic Center, California
- Sn-isotope fractionation as a record of hydrothermal redox reactions
- Surface energy of fayalite and its effect on Fe-Si-O oxygen buffers and the olivine-spinel transition
- Micro- and nano-scale study of deformation induced mineral transformations in Mg-phyllosilicate-rich fault gouges from the Galera Fault Zone (Betic Cordillera, SE Spain)
- High-pressure study of dravite tourmaline: Insights into the accommodating nature of the tourmaline structure
- Positively oriented trigons on diamonds from the Snap Lake kimberlite dike, Canada: Implications for fluids and kimberlite cooling rates
- Comparison of Rietveld-compatible structureless fitting analysis methods for accurate quantification of carbon dioxide fixation in ultramafic mine tailings
- Polyphase solid-inclusions formed by interactions between infiltrating fluids and precursor minerals enclosed in garnet of UHP rocks from the Dabie Shan, China
- Changes in physical properties of 4C pyrrhotite (Fe7S8) across the 32 K Besnus transition
- A rapid and precise quantitative electron probe chemical mapping technique and its application to an ultrahigh-pressure eclogite from the Moldanubian Zone of the Bohemian Massif (Nové Dvory, Czech Republic)
- Stracherite, BaCa6(SiO4)2[(PO4)(CO3)]F, the first CO3-bearing intercalated hexagonal antiperovskite from Negev Desert, Israel
- Letter
- Fe-Ni ideality during core formation on Earth
- New Mineral Names