Thermoelastic properties of ringwoodite (Fe x,Mg 1-x) 2SiO 4: Its relationship to the 520km seismic discontinuity

Maribel Núñez Valdez, Zhongqing Wu, Yonggang G. Yu, Justin Revenaugh, Renata M Wentzcovitch

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

We combine density functional theory (DFT) within the local density approximation (LDA), the quasiharmonic approximation (QHA), and a model vibrational density of states (VDoS) to calculate elastic moduli and sound velocities of γ-(Fe x, Mg 1-x) 2SiO 4 (ringwoodite), the most abundant mineral of the lower Earth's transition zone (TZ). Comparison with experimental values at room-temperature and high pressure or ambient-pressure and high temperature shows good agreement with our first-principles findings. Then, we investigate the contrasts associated with the Β→γ(Fe x, Mg 1-x) 2SiO 4 transformation at pressures and temperatures relevant to the TZ. This information offers clearly defined reference values to advance the understanding of the nature of the 520km seismic discontinuity.

Original languageEnglish (US)
Pages (from-to)115-122
Number of pages8
JournalEarth and Planetary Science Letters
Volume351-352
DOIs
StatePublished - Oct 15 2012

Keywords

  • 520km discontinuity
  • Elasticity
  • First principles
  • Ringwoodite
  • Transition zone

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