Comparison of fission-track, K-Ar, and Rb-Sr radiometric age determinations from some granite plutons in Maine

Journal of Research of the U.S. Geological Survey
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Abstract

Fission-track ages have been determined on eight apatite and four sphene concentrates separated from plutonic rocks in Maine. K-Ar and Rb-Sr ages for some of these rocks were previously published. In northeastern Maine the whole-rock Rb-Sr, biotite K-Ar, and apatite fission-track ages are concordant at 400-420 million years, whereas in south-central Maine the apatite fission-track age is 150 m.y. and the biotite K-Ar age is about 250 m.y. At intermediate positions along the traverse the whole-rock Rb-Sr, biotite K-Ar, and sphene fission-track ages agree fairly well in the range 390-325 m.y., but the apatite fission-track ages are all about 100 m.y. younger. This pattern is consistent with the hypothesis of burial metamorphism and uplift as proposed in 1970 by Zartman, Hurley, Krueger, and Giletti to explain the abundance of Permian K-Ar ages in central New England.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Comparison of fission-track, K-Ar, and Rb-Sr radiometric age determinations from some granite plutons in Maine
Series title Journal of Research of the U.S. Geological Survey
Volume 3
Issue 2
Year Published 1975
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 3 p.
First page 229
Last page 231
Country United States
State Maine
Online Only (Y/N) N
Additional Online Files (Y/N) N
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