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1 results

  • Modification of antiphase domain sizes in omphacite by dislocation glide and creep mechanisms and its petrological consequences

  • H. L. M. van Roermund, J. M. Lardeaux
  • Journal:
    Mineralogical Magazine / Volume 55 / Issue 380 / September 1991
    Published online by Cambridge University Press:
    05 July 2018, pp. 397-407

  • A T.E.M. study of omphacites from the western Italian Alps (Sesia Lanzo Zone and Monviso eclogites) has revealed a bimodal size distribution of antiphase domains: (a) 250–350 Å, (b) ≥ 2500 Å. In addition observed dislocation substructures and ‘large-scale’ antiphase domains are intimately interconnected.

    A model is presented that can explain modification of the antiphase domain sizes by the interplay of cooling/growth and dislocation glide and/or creep mechanisms. Subsequent coarsening of the modified antiphase domains is inferred to be the result of surface free-energy processes. The model clearly illustrates that only the ‘relatively undeformed’ areas containing the small-scale antiphase domains can be used for thermometric methods.