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

T. Kubo, Eiji Otani, T. Kato, T. Shinmei, K. Fujino

研究成果: Article査読

28 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1-6
ページ数6
ジャーナルPhysics and Chemistry of Minerals
26
1
DOI
出版ステータスPublished - 1998 12 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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