1. ZIRCON U-PB AGE DATA, ALASKA HIGHWAY CORRIDOR, TANACROSS AND NABESNA QUADRANGLES, ALASKA.
- Author
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Solie, Diana N., O'Sullivan, Paul, Werdon, Melanie B., Freeman, Larry K., Newberry, Rainer J., Szumigala, David J., and Hubbard, Trent D.
- Subjects
METAMORPHIC rocks ,ZIRCON analysis ,ROCKS ,GEOLOGY - Abstract
Twenty-two igneous and metamorphic rock samples were collected in a 20-km-long swath centered on the Alaska Highway between Tetlin Junction, Alaska, and the Canada border. The 15 felsic plutonic rock samples and one gabbro sample yield Cretaceous zircon U-Pb weighted-mean ages ranging from 95.7 Ma to 106.2 Ma. Zircons from a metadiorite yield a Triassic weighted-mean age of about 241.9 Ma. Metamorphic zircons from two samples with felsic igneous protoliths yield Mississippian weighted-mean ages of 351.7 Ma and 354.6 Ma. Detrital zircons from two metaconglomerates yield individual grain ages from 100 Ma to 1,811 Ma, but are predominantly between 300 Ma and 345 Ma. Detrital zircons from a quartzite yield peaks at about 2,648 Ma, 1,946 Ma, and 1,807 Ma. [ABSTRACT FROM AUTHOR]
- Published
- 2014