Olivine to spinel transformation in Mg2SiO4 via faulted structures
作者： J. N. Boland , Lin-gun Liu
DOI: 10.1038/303233A0
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摘要: The mechanism of the olivine to spinel transformation has been studied in relatively few systems experimentally, most previous research being directed determination phase boundaries pressure–temperature (P, T) space1 or crystal structure modelling low- and high-pressure phases2–6. Two more recent studies on magnesium germanate7 (Mg2GeO4) nickel silicate8 (Ni2SiO4) revealed that there was no special orientation relationship between (α) (γ). Furthermore, evidence by way stacking faults twins found transforming support proposal martensitic-like4–6. Consequently, it concluded these had occurred nucleation growth processes7,8. In contrast, α γ phases have observed as tabular intergrowths partially transformed iron end-member, fayalite (Fe2SiO4)9, with interphase (100)Ol (111)Sp. This microstructure are compatible martensitic transformation. We report here results transmission electron microscopy → pure end-member olivine, forsterite (Mg2SiO4). Not only is a two during transformation, is, parallel (111)Sp [001]Ol, [110]Sp, but some residual grains an extremely high density well dislocation density.
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