Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar

S. Lundin, K. Catalli, J. Santillán, Sang-Heon Shim, V. B. Prakapenka, M. Kunz, Y. Meng

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

In order to investigate the effect of Fe on the equation of state (EOS), the volume of the perovskite (Pv) phases, (Mg1-xFex)SiO3, with different Fe contents (x = 0, 0.09, 0.15), has been measured at high pressures up to 1 Mbar in an Ar or NaCl medium. A bulk modulus (K0) ranging between 255 and 261 GPa is obtained when the Au scales consistent with the Pt scale are used and the data are fit to the second order Birch-Murnaghan (BM) equation. When the third order BM equation is used, we obtain K0 = 250-264 GPa and K0 = 3.7-4.5, which is consistent with previous low-pressure X-ray diffraction and Brillouin measurements. Within experimental uncertainties (0.5% in volume and 6% in bulk modulus), we do not resolve differences in the EOS between Fe-bearing (up to 15%) and Fe-free Pv to 1 Mbar (2600-km depth in the mantle). This is in contrast with the much larger effect of the Fe spin transition for the EOS of ferropericlase (Fp) reported recently. This is perhaps due to much more diverse states of Fe (e.g., oxidation, coordination, and spin states) in Pv than in Fp.

Original languageEnglish (US)
Pages (from-to)97-102
Number of pages6
JournalPhysics of the Earth and Planetary Interiors
Volume168
Issue number1-2
DOIs
StatePublished - May 2008
Externally publishedYes

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perovskite
equation of state
silicates
Earth mantle
equations of state
silicate
bulk modulus
mantle
low pressure
X-ray diffraction
oxidation
diffraction
effect
x rays

Keywords

  • Equation of state
  • Mantle
  • Perovskite
  • Spin transition
  • X-ray diffraction

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science
  • Physics and Astronomy (miscellaneous)
  • Astronomy and Astrophysics

Cite this

Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar. / Lundin, S.; Catalli, K.; Santillán, J.; Shim, Sang-Heon; Prakapenka, V. B.; Kunz, M.; Meng, Y.

In: Physics of the Earth and Planetary Interiors, Vol. 168, No. 1-2, 05.2008, p. 97-102.

Research output: Contribution to journalArticle

Lundin, S. ; Catalli, K. ; Santillán, J. ; Shim, Sang-Heon ; Prakapenka, V. B. ; Kunz, M. ; Meng, Y. / Effect of Fe on the equation of state of mantle silicate perovskite over 1 Mbar. In: Physics of the Earth and Planetary Interiors. 2008 ; Vol. 168, No. 1-2. pp. 97-102.
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