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

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

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29 Citations (Scopus)


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
Issue number1
Publication statusPublished - 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Geochemistry and Petrology


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