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U-Pb Zircon Geochronology of the Adirondack Mountains and Implications for Their Geologic Evolution

TitleU-Pb Zircon Geochronology of the Adirondack Mountains and Implications for Their Geologic Evolution
Publication TypeJournal Article
Year of Publication1988
AuthorsMcLelland, JM, Chiarenzelli, JR, Whitney, PR, Isachsen, YW
JournalGeology
Volume16
Pagination920-924
Keywordsgeology
Abstract

U-Pb zircon studies of metamorphosed igneous rocks in the Adirondack Mountains have yielded preliminary ages within the range 1420-990 Ma. Several geochronologically and geochemically distinct episodes of igneous intrusion and at least one pre-granulite facies dynamothermal metamorphic event are documented. This information is consistent with recent field and geochronological studies throughout the Grenville province and suggests that a complex sequence of events occurred in the Adirondack Mountains prior to the widespread deformation and metamorphism commonly attributed to the ∼1100-1000 Ma Ottawan phase of the Grenvillian orogenic cycle.

URLhttp://geology.gsapubs.org/content/16/10/920.short
DOI10.1130/0091-7613(1988)​016<0920:UPZGOT>​2.3.CO;2