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

Journal Article · Wed Jan 01 04:00:00 EST 1975 · J. Res. U.S. Geol. Surv., v. 3, no. 2, pp. 229-231

OSTI ID:4152731

Naeser, C W; Brookins, D G

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 to 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 to 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. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-33-007332
• OSTI ID: 4152731
• Journal Information: J. Res. U.S. Geol. Surv., v. 3, no. 2, pp. 229-231, Journal Name: J. Res. U.S. Geol. Surv., v. 3, no. 2, pp. 229-231; ISSN JRGSA
• Country of Publication: United States
• Language: English

Related Subjects

*GRANITES-- ISOTOPE DATING
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POTASSIUM ISOTOPES
RUBIDIUM ISOTOPES
STRONTIUM ISOTOPES