Experimental investigation of the α-β transformation of San Carlos olivine single crystal

Tomoaki Kubo, E. Ohtani, T. Kato, T. Shinmei, K. Fujino

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Single crystalline San Carlos olivine (1 mm cube) was transformed to (Mg,Fe)2SiO4 β-phase at 13.5-15 GPa, 1030-1330 °C for 0-600 min using a multi-anvil high pressure apparatus. The α-β transformation occurred by incoherent surface nucleation and interface-controlled growth and recovered partially transformed samples showed sharply defined reaction rim. The growth rate of the β-phase rim significantly decreased with time and the growth eventually ceased. TEM observations revealed that many dislocations were created in both the relict olivine just near the α-β interface and the β-phase in the rim, which show evidence for deformation caused by interfacial stresses associated with the misfit elastic strain of the transformation. The observed tangled dislocation texture in β-phase suggested that the β-phase rim was hardened and relaxation of the interfacial stress was retarded. This probably caused a localized pressure drop in the relict olivine and decreased the growth rate. Time-dependent growth rates of β-phase is possibly controlled by the rheology of β-phase, which must be considered for the prediction of the olivine metastability in the subducting slabs.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysics and Chemistry of Minerals
Volume26
Issue number1
DOIs
Publication statusPublished - Dec 1 1998

Fingerprint

Olivine
olivine
Single crystals
crystal
dislocation
pressure drop
rheology
Rheology
nucleation
Pressure drop
transmission electron microscopy
slab
Nucleation
Textures
texture
Crystalline materials
Transmission electron microscopy
prediction

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Geochemistry and Petrology

Cite this

Experimental investigation of the α-β transformation of San Carlos olivine single crystal. / Kubo, Tomoaki; Ohtani, E.; Kato, T.; Shinmei, T.; Fujino, K.

In: Physics and Chemistry of Minerals, Vol. 26, No. 1, 01.12.1998, p. 1-6.

Research output: Contribution to journalArticle

Kubo, Tomoaki ; Ohtani, E. ; Kato, T. ; Shinmei, T. ; Fujino, K. / Experimental investigation of the α-β transformation of San Carlos olivine single crystal. In: Physics and Chemistry of Minerals. 1998 ; Vol. 26, No. 1. pp. 1-6.
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