Grain growth kinetics of ringwoodite and its implication for rheology of the subducting slab

Daisuke Yamazaki, Toru Inoue, Mana Okamoto, Tetsuo Irifune

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Grain growth rates of Mg2SiO4- and (Mg0.9Fe0.1)2SiO4 -ringwoodites have been studied under the conditions of the mantle transition zone at a pressure of 21 GPa and temperatures ranging from 1473 to 2023 K, using a Kawai-type high-pressure apparatus. The grain growth rates were expressed by Gn - G0n =k0texp (-H*/RT) where G (m) is grain size at time t (s), and G0 is the initial grain size at t=0, with n=4.5 ± 0.8, and H* = 414 kJ/mol and log k0 = -20.4 ± 1.6 m4.5/s for (Mg0.9Fe0.1) 2SiO4-ringwoodite, and H* = 456 kJ/mol and log k0 = -20.2 ± 1.4 m4.5/s for Mg2SiO4-ringwoodite. Using these kinetic parameters for grain growth, we estimated the grain size of ringwoodite in the cold subducting slabs to be less than ∼100 μm. This suggests that the dominant deformation mechanism in the subducting slab is diffusion creep. It is also likely that some cold slabs are softer than the warmer surrounding mantle.

Original languageEnglish
Pages (from-to)871-881
Number of pages11
JournalEarth and Planetary Science Letters
Volume236
Issue number3-4
DOIs
Publication statusPublished - Aug 15 2005
Externally publishedYes

Fingerprint

ringwoodite
Growth kinetics
Grain growth
rheology
Rheology
slab
slabs
grain size
kinetics
Earth mantle
mantle
deformation mechanism
Kinetic parameters
transition zone
creep
Creep
temperature
Temperature
cold
forsterite

Keywords

  • Grain growth
  • Grain size
  • Mantle transition zone
  • Rheology
  • Ringwoodite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Grain growth kinetics of ringwoodite and its implication for rheology of the subducting slab. / Yamazaki, Daisuke; Inoue, Toru; Okamoto, Mana; Irifune, Tetsuo.

In: Earth and Planetary Science Letters, Vol. 236, No. 3-4, 15.08.2005, p. 871-881.

Research output: Contribution to journalArticle

Yamazaki, Daisuke ; Inoue, Toru ; Okamoto, Mana ; Irifune, Tetsuo. / Grain growth kinetics of ringwoodite and its implication for rheology of the subducting slab. In: Earth and Planetary Science Letters. 2005 ; Vol. 236, No. 3-4. pp. 871-881.
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