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Isotopic Age Study, Dutchess County, New York

Lamont Geological Observatory (Columbia University), Palisades, N. Y

Rb-Sr and K-Ar isotopic age determinations on mica and whole-rock samples from Dutchess County, N. Y. are consistent with a period of metamorphism with a minimum age of 430 m. y. (million years), followed by a less intense regional reheating about 360 m. y. ago. Pre-existing radio-genic argon in detrital minerals in the isoclinally folded Paleozoic slates, west of Balk's (1936) biotite isograd, was driven out at the time of folding. Lower apparent ages in western Connecticut suggest a transitional zone to the area farther east affected by a 260 m. y. metamorphic event.

This article has been cited by other articles:

				M. H. DODSON and D. C. REX Potassium-argon ages of slates and phyllites from south-west England Quarterly Journal of the Geological Society, February 1, 1970; 126(1-4): 465 - 498. [Abstract] [PDF]