Startseite Pressure-induced C23–C37 transition and compression behavior of orthorhombic Fe2S to Earth’s core pressures and high temperatures
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Pressure-induced C23–C37 transition and compression behavior of orthorhombic Fe2S to Earth’s core pressures and high temperatures

  • Claire C. Zurkowski , Barbara Lavina , Nigel M. Brauser , Anne H. Davis , Stella Chariton , Sergey Tkachev , Eran Greenberg , Vitali B. Prakapenka und Andrew J. Campbell
Veröffentlicht/Copyright: 29. September 2022
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 107 Heft 10

Abstract

The phase stability of orthorhombic Fe2S was explored to 194 GPa and 2500 K using powder and multigrain synchrotron X‑ray diffraction techniques. Between 30 and 120 GPa, a C23-like (Co2P, Pnma, Z = 4) Fe2S structure is observed and determined to exhibit a highly compressible a axis. A softening of the a axis occurs between 120 and 150 GPa and a relative stiffening of the b and c axes accompanies this compressibility change. Above 150 GPa, the a axis stifens as the b and c axes soften, and a C37-like (Co2Si, Pnma, Z = 4) Fe2S unit cell is measured. On the basis of these changes in unit cell geometry, a pressure-induced C23–C37 Fe2S phase transition is inferred between 120–150 GPa. The C23 and C37 (Pnma, Z = 4) structures are closely related and share the same site symmetries. Forming the C37 structure from the C23 structure requires a shortening of the a axis and lengthening of the b and c axes accompanied by a four- to fivefold coordination change. The softening of the a axis above 120 GPa may therefore indicate the onset of a coordination change, and the final compressibility change above 150 GPa may mark the completion of this phase transition. The presented pressure-temperature (P-T) stabilities of C23 and C37 structures of Fe2S are in agreement with and resolve the differing observations of two previous studies (Tateno et al. 2019; Zurkowski et al. 2022). As C37 Fe2S is observed to core-mantle boundary pressures and high temperatures, the C37 Fe2S density profile through Earth’s outer core was determined by fitting the C23 Fe2S equation of state (<120 GPa) and applying a 1.6% volume reduction based on the C37 Fe2S volume residuals to this fit. Comparing the density of liquid C37 Fe2S with that of liquid hcp-Fe (Dewaele et al. 2006) and the seismologically determined density deficit of Earth’s core (Irving et al. 2018), 13.9 ± 1.5 wt% and 8.6 ± 0.8 wt% sulfur are required to match the densities at the CMB and ICB, respectively, for a purely Fe-S core.

Keywords: Fe-sulfide; Earth’s core; high pressure; diamond anvil cell; equation of state; phase transition; iron alloys; high temperature

† Present address: Applied Physics Department, Soreq Nuclear Research Center (NRC), Yavne 81800, Israel.

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Received: 2021-06-19
Accepted: 2021-10-05
Published Online: 2022-09-29
Published in Print: 2022-10-26

© 2022 Mineralogical Society of America

Artikel in diesem Heft

  1. Experimentally derived F, Cl, and Br fluid/melt partitioning of intermediate to silicic melts in shallow magmatic systems
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https://doi.org/10.2138/am-2022-8187
Schlagwörter für diesen Artikel
Fe-sulfide; Earth’s core; high pressure; diamond anvil cell; equation of state; phase transition; iron alloys; high temperature

Artikel in diesem Heft

  1. Experimentally derived F, Cl, and Br fluid/melt partitioning of intermediate to silicic melts in shallow magmatic systems
  2. Spectroscopic study on the local structure of sulfate ( S O 4 2 − ) incorporated in scorodite (FeAsO4·2H2O) lattice: Implications for understanding the Fe(III)-As(V)- S O 4 2 − -bearing minerals formation
  3. Oxidation of arcs and mantle wedges by reduction of manganese in pelagic sediments during seafloor subduction
  4. Raman scattering and Cr3+ luminescence study on the structural behavior of δ-AlOOH at high pressures
  5. Jadeite and related species in shocked meteorites: Limitations on inference of shock conditions
  6. Pressure-induced C23–C37 transition and compression behavior of orthorhombic Fe2S to Earth’s core pressures and high temperatures
  7. Estimating ferric iron content in clinopyroxene using machine learning models
  8. Pyradoketosite, a new, unexpected, polymorph of Ag3SbS3 from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy)
  9. Pyrite geochemistry and its implications on Au-Cu skarn metallogeny: An example from the Jiguanzui deposit, Eastern China
  10. Synthesis of ferrian and ferro-saponites: Implications for the structure of (Fe,Mg)-smectites formed under reduced conditions
  11. Natural cubic perovskite, Ca(Ti,Si,Cr)O3–δ, a versatile potential host for rock-forming and less-common elements up to Earth’s mantle pressure
  12. Nazarovite, Ni12P5, a new terrestrial and meteoritic mineral structurally related to nickelphosphide, Ni3P
  13. Zinconigerite-2N1S ZnSn2Al12O22(OH)2 and zinconigerite-6N6S Zn3Sn2Al16O30(OH)2, two new minerals of the nolanite-spinel polysomatic series from the Xianghualing skarn, Hunan Province, China
  14. Tracing structural relicts of the ikaite-to-calcite transformation in cryogenic cave glendonite
  15. Oxygen-fugacity evolution of magmatic Ni-Cu sulfide deposits in East Kunlun: Insights from Cr-spinel composition
  16. New Mineral Names
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