40Ar/39Ar constraints on chronology of Augusta Fault Zone movement and late Alleghanian extension, southern Appalachian Piedmont, South Carolina and Georgia

H. D. Maher, R. D. Dallmeyer, D. T. Secor, P. E. Sacks

    Research output: Contribution to journalArticlepeer-review

    21 Scopus citations

    Abstract

    Geologic relations and the 40Ar/39Ar cooling ages suggest that the Augusta fault juxtaposed Augusta terrane rocks from upper crustal levels against Savannah River terrane rocks from lower crustal levels at and after about 274 Ma. Late Alleghanian extension along the Augusta fault zone is consistent with gravitational collapse of an orogenic topographic front which developed during crustal shortening in early stages of the Alleghanian orogeny. The role of Alleghanian extension in the Piedmont tectonothermal history could be significant. -from Authors

    Original languageEnglish (US)
    Pages (from-to)428-448
    Number of pages21
    JournalAmerican Journal of Science
    Volume294
    Issue number4
    DOIs
    StatePublished - 1994

    ASJC Scopus subject areas

    • Earth and Planetary Sciences(all)

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