40Ar/39Ar and K-Ar data bearing on the metamorphic and tectonic history of western New England.

J. F. Sutter, N. M. Ratcliffe, S. B. Mukasa

Research output: Contribution to journalArticle

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Abstract

40Ar/39Ar ages of coexisting biotite and hornblende from Proterozoic Y gneisses of the Berkshire and Green Mountain massifs, as well as 40Ar/39Ar and K/Ar mineral and whole-rock ages from Paleozoic metamorphic rocks, suggest that the thermal peak for the dominant metamorphic recrystallization in W New England occurred 465+ or -5Ma ago (Taconian). Although textural data indicate a complex metamorphic-tectonic history for Paleozoic rocks, no evidence in rocks at least as high as kyanite grade dictates an Acadian age for the Barrovian metamorphism. Available 40Ar/39Ar and K/Ar data suggest that the low-grade metamorphism and cleavage formation in Taconic allochthons and the higher-grade metamorphism and emplacement of the Berkshire massif allochthon are Taconian. -from Authors

Original languageEnglish (US)
Pages (from-to)123-136
Number of pages14
JournalGeological Society of America Bulletin
Volume96
Issue number1
DOIs
StatePublished - 1985

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Cited By :7

Export Date: 3 November 2016

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