Evidence of syndeformational contact metamorphism from porphyroblast-matrix microstructural relationships

R. H. Vernon*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Cordierite porphyroblasts in three high-level contact metamorphic aureoles in southeast Australia show microstructural evidence of having grown during the development of a crenulation-foliation. The evidence includes curvature of straight inclusion trails into crenulated matrix folia, and deflection of matrix foliations, including micaceous crenulation folia (axial surfaces), around porphyroblasts. In some rocks, coarsening has obliterated evidence of crenulations in the matrix, owing to heating having outlasted deformation. The crenulations are confined to the contact aureoles of granitoid plutons that have not undergone penetrative post-intrusion deformation. Therefore, the crenulations appear to have resulted from local deformation caused by the intrusion.

    Original languageEnglish
    Pages (from-to)113-126
    Number of pages14
    JournalTectonophysics
    Volume158
    Issue number1-4
    DOIs
    Publication statusPublished - 10 Feb 1989

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