Startseite Phase relations of MgFe2O4 at conditions of the deep upper mantle and transition zone
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Phase relations of MgFe2O4 at conditions of the deep upper mantle and transition zone

  • Laura Uenver-Thiele EMAIL logo , Alan B. Woodland , Tiziana Boffa Ballaran , Nobuyoshi Miyajima und Dan J. Frost
Veröffentlicht/Copyright: 6. März 2017
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 102 Heft 3

Abstract

Phase relations of magnesioferrite (MgFe2O4) have been studied between 8 and 18 GPa and 1000–1600 °C using multi-anvil experiments. At 8–10 GPa and 900–1200 °C, MgFe2O4 breaks down to Fe2O3+MgO. At higher temperatures, a new phase appears along with Fe2O3. Although this new phase is unquenchable, EPMA and TEM data point to a composition with Mg5Fe2O8 or Mg4Fe2O7 stoichiometry. Depending on pressure and temperature, other stoichiometries also appear to be stable together with Fe2O3. In terms of pressure, the stability field of the unquenchable phases + hematite widens with increasing temperature to 3 ± 1 GPa at ~1400 °C, and then narrows to ~1 GPa at 1600 °C. The recoverable assemblage of Mg2Fe2O5+Fe2O3 becomes stable between 11–13 GPa. The Mg2Fe2O5+Fe2O3 assemblage is stable up to at least 18 GPa at 1300 °C without any evidence of a hp-MgFe2O4 phase. In addition, hematite plays an important role in the phase relations of MgFe2O4 by being present over a wide range in pressure and temperature together with a Mg-rich Fe-oxide. Interestingly, hematite incorporates variable amounts of Mg whereby its concentration appears to be a function of temperature. This experimental study has implications for interpreting inclusions in natural diamonds where magnesioferrite occurs by placing a maximum pressure stability on the formation of this phase. Through these inclusions, it also provides constraints on diamond formation and their subsequent evolution prior to eruption. For example, the occasional observation of nano-sized magnesioferrite within (Mg,Fe)O inclusions must have either formed from a high-pressure precursor phase with a different stoichiometry at transition zone or upper lower mantle conditions, or it exsolved directly from the host (Mg,Fe)O under upper mantle conditions (i.e., <9–10 GPa). Since several studies report various non-silicate inclusions with simple oxide compositions, including magnesioferrite, magnetite, or ferropericlase, such inclusions provide evidence for variable redox conditions at the time of entrapment.

Keywords: Magnesioferrite; MgFe2O4; Mg2Fe2O5; deep upper mantle; transition zone; high pressure

Acknowledgments

This work was supported by the Deutsche Forschungsgemeinschaft through grants WO 652/20-1 and BO 2550/7-1 to A.B.W. and T.B.B., respectively. E. Alig and H. Höfer are thanked for helping with the X-ray powder diffraction and microprobe measurements, respectively. The manuscript was improved through insightful comments from R. Myhill and an anonymous reviewer. Fruitful discussions with R. Angel and F. Brenker are gratefully acknowledged.

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Received: 2016-6-3
Accepted: 2016-10-4
Published Online: 2017-3-6
Published in Print: 2017-3-1

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-5871
Schlagwörter für diesen Artikel
Magnesioferrite; MgFe2O4; Mg2Fe2O5; deep upper mantle; transition zone; high pressure

Artikel in diesem Heft

  1. Special collection: From magmas to ore deposits
  2. Sulfide-silicate textures in magmatic Ni-Cu-PGE sulfide ore deposits: Disseminated and net-textured ores
  3. Special collection: Olivine
  4. Nickel variability in Hawaiian olivine: Evaluating the relative contributions from mantle and crustal processes
  5. Special collection: Water in nominally hydrous and anhydrous minerals
  6. Hydrogen incorporation mechanisms in forsterite: New insights from 1H and 29Si NMR spectroscopy and first-principles calculation
  7. Special collection: Water in nominally hydrous and anhydrous minerals
  8. New SIMS reference materials for measuring water in upper mantle minerals
  9. Special collection: Apatite: A common mineral, uncommonly versatile
  10. Co-variability of S6+, S4+, and S2− in apatite as a function of oxidation state: Implications for a new oxybarometer
  11. Special collection: Apatite: A common mineral, uncommonly versatile
  12. Apatite in the dike-gabbro transition zone of mid-ocean ridge: Evidence for brine assimilation by axial melt lens
  13. Special collection: Apatite: A common mineral, uncommonly versatile
  14. LA-Q-ICP-MS apatite U/Pb geochronology using common Pb in plagioclase: Examples from layered mafic intrusions
  15. Special collection: Apatite: A common mineral, uncommonly versatile
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  26. Thermodynamics and crystal chemistry of rhomboclase, (H5O2)Fe(SO4)2⋅2H2O, and the phase (H3O)Fe(SO4)2 and implications for acid mine drainage
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  38. New Mineral Names
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