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Open-File Report 2011–1250

40Ar/39Ar Age-Spectrum Data for Hornblende, Biotite, White Mica, and K-Feldspar Samples From Metamorphic Rocks in the Great Smoky Mountains of North Carolina and Tennessee

By Michael J. Kunk and Ryan McAleer

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This report contains reduced 40Ar/39Ar data of hornblende, biotite, white mica and (or) sericite, and potassium-feldspar mineral separates and phyllite groundmass samples from metamorphic rocks of the Great Smoky Mountains in North Carolina and Tennessee. Included in this report are information on the location of the samples and a brief description of the samples. The data contained herein are not interpreted in a geological context, and care should be taken by users unfamiliar with argon isotopic data in the use of these results. No geological meaning is implied for any of the apparent ages presented below, and many of the individual apparent ages are not geologically meaningful. This report is primarily a detailed source document for subsequent publications that will integrate these data into a geological context. All the samples in this report were collected in and around the Great Smoky Mountain National Park in western North Carolina and eastern Tennessee.

Posted October 11, 2011

For additional information contact:
Michael J. Kunk
U.S. Geological Survey
926A National Center
12201 Sunrise Valley Drive
Reston, VA 20192-0002
Telephone: (703) 648–5332
Fax: (703) 648–6953

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Kunk, M.J., and McAleer, Ryan, 2011, 40Ar/39Ar age-spectrum data for hornblende, biotite, white mica, and K-feldspar samples from metamorphic rocks in the Great Smoky Mountains of North Carolina and Tennessee: U.S. Geological Survey Open-File Report 2011–1250, 56 p., available at




Sample Preparation

Sample Analysis

Isotopic Data Reduction


References Cited

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