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Composition dependence of spin transition in (Mg,Fe)SiO3 bridgmanite

  • Susannah M. Dorfman EMAIL logo , James Badro , Pascal Rueff , Paul Chow , Yuming Xiao and Philippe Gillet
Published/Copyright: September 30, 2015
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American Mineralogist
From the journal American Mineralogist Volume 100 Issue 10

Abstract

Spin transitions in (Mg,Fe)SiO3 bridgmanite have important implications for the chemistry and dynamics of Earth’s lower mantle, but have been complex to characterize in experiments. We examine the spin state of Fe in highly Fe-enriched bridgmanite synthesized from enstatites with measured compositions (Mg0.61Fe0.38Ca0.01)SiO3 and (Mg0.25Fe0.74Ca0.01)SiO3. Bridgmanite was synthesized at 78-88 GPa and 1800-2400 K and X‑ray emission spectra were measured on decompression to 1 bar (both compositions) and compression to 126 GPa [(Mg0.61Fe0.38Ca0.01)SiO3 only] without additional laser heating. Observed spectra confirm that Fe in these bridgmanites is dominantly high spin in the lower mantle. However, the total spin moment begins to decrease at ~50 GPa in the 74% FeSiO3 composition. These results support density functional theory predictions of a lower spin transition pressure in highly Fe-enriched bridgmanite and potentially explain the high solubility of FeSiO3 in bridgmanite at pressures corresponding to Earth’s deep lower mantle.

Keywords: Bridgmanite; spin transition; iron-bearing silicates; lower mantle
Received: 2014-9-10
Accepted: 2015-5-3
Published Online: 2015-9-30
Published in Print: 2015-10-1

© 2015 by Walter de Gruyter Berlin/Boston

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  8. Polycrystallinity of green rust minerals and their synthetic analogs: Implications for particle formation and reactivity in complex systems
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https://doi.org/10.2138/am-2015-5190
Keywords for this article
Bridgmanite; spin transition; iron-bearing silicates; lower mantle

Articles in the same Issue

  1. Reaching new boundaries for in-situ U-Th geochronology
  2. Normal to inverse transition in martian spinel: Understanding the interplay between chromium, vanadium, and iron valence state partitioning through a crystal-chemical lens
  3. Accuracy of timescales retrieved from diffusion modeling in olivine: A 3D perspective
  4. Phosphoran olivine overgrowths: Implications for multiple impacts to the Main Group pallasite parent body
  5. Diffusion of phosphorus in olivine and molten basalt
  6. Oceanic lavas sampling the high-3He/4He mantle reservoir: Primitive, depleted, or re-enriched?
  7. U-Th baddeleyite geochronology and its significance to date the emplacement of silica undersaturated magmas
  8. Polycrystallinity of green rust minerals and their synthetic analogs: Implications for particle formation and reactivity in complex systems
  9. Fe pre-enrichment: A new method to counteract iron loss in experiments on basaltic melts
  10. Fe-Mg diffusion in spinel: New experimental data and a point defect model
  11. Age, petrochemistry, and origin of a REE-rich mineralization in the Longs Peak-St. Vrain batholith, near Jamestown, Colorado (U.S.A.)
  12. Laser-induced breakdown spectroscopy (LIBS) as a tool for in situ mapping and textural interpretation of lithium in pegmatite minerals
  13. Evidence for Nb2+ and Ta3+ in silicate melts under highly reducing conditions: A XANES study
  14. Elastic softening of leucite and the lack of polar domain boundaries
  15. New thermobarometers for martian igneous rocks, and some implications for secular cooling on Mars
  16. An updated calibration of the plagioclase-liquid hygrometer-thermometer applicable to basalts through rhyolites
  17. Water effects on the anharmonic properties of forsterite
  18. Synthesis and structure of a stuffed derivative of α-quartz, Mg0.5AlSiO4
  19. Equation of state and elasticity of the 3.65 Å phase: Implications for the X-discontinuity
  20. Ca-Zn solid solutions in C2/c pyroxenes: Synthesis, crystal structure, and implications for Zn geochemistry
  21. Aluminum environments in synthetic Ca-Tschermak clinopyroxene (CaAlAlSiO6) from Rietveld refinement, 27Al NMR, and first-principles calculations
  22. Trioctahedral Fe-rich micas: Relationships between magnetic behavior and crystal chemistry
  23. High-pressure compressibility and phase stability of Mn-dolomite (kutnohorite)
  24. Composition dependence of spin transition in (Mg,Fe)SiO3 bridgmanite
  25. Oriented multiphase needles in garnet from ultrahigh-temperature granulites, Connecticut, U.S.A.
  26. Solubility and solution mechanisms of chlorine and fluorine in aluminosilicate melts at high pressure and high temperature
  27. Volatiles in magmas related to the Campanian Ignimbrite eruption: Experiments vs. natural findings
  28. Aluminosilicate melts and glasses at 1 to 3 GPa: Temperature and pressure effects on recovered structural and density changes
  29. Role of volatiles (S, Cl, H2O) and silica activity on the crystallization of haüyne and nosean in phonolitic magmas (Eifel, Germany and Saghro, Morocco)
  30. P-V-T equation of state and high-pressure behavior of CaCO3 aragonite
  31. A possible new Al-bearing hydrous Mg-silicate (23 Å phase) in the deep upper mantle
  32. Synthesis of large wadsleyite single crystals by solid-state recrystallization
  33. Decagonite, Al71Ni24Fe5, a quasicrystal with decagonal symmetry from the Khatyrka CV3 carbonaceous chondrite
  34. Earth’s “missing” minerals
  35. Magnetite-rutile symplectite derived from ilmenite-hematite solid solution in the Xinjie Fe-Ti oxide-bearing, mafic-ultramafic layered intrusion (SW China)
  36. New Mineral Names
  37. Book Review: Arsenic: Environmental Geochemistry, Mineralogy, and Microbiology, RIMG Volume 79.
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