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Open-File Report 2011–1309

Prepared in cooperation with the State of Vermont,
Vermont Geological Survey

Provisional Zircon and Monazite Uranium-Lead Geochronology for Selected Rocks From Vermont

By John N. Aleinikoff, Nicholas M. Ratcliffe, and Gregory J. Walsh

Thumbnail of and link to report PDF (1.6 MB)Abstract

This report presents the results of zircon and monazite uranium-lead (U-Pb) geochronologic analyses of 24 rock samples. The samples in this study were collected from mapped exposures identified while conducting either new, detailed (1:24,000-scale) geologic quadrangle mapping or reconnaissance mapping, both of which were used for compilation of the bedrock geologic map of Vermont. All of the collected samples were judged to be igneous rocks (either intrusive or extrusive) on the basis of field relations and geochemistry. The one exception is the Okemo Quartzite on Ludlow Mountain. These geochronologic data were used to supplement regional correlations between igneous suites on the basis of similar geochemistry and geologic mapping.

First posted January 25, 2012

For additional information contact:
John N. Aleinikoff
U.S. Geological Survey
Denver Federal Center MS 963
Denver, Colorado 80225

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Suggested citation:

Aleinikoff, J.N., Ratcliffe, N.M., and Walsh, G.J., 2011, Provisional zircon and monazite uranium-lead geochronology for selected rocks from Vermont: U.S. Geological Survey Open-File Report 2011–1309, 46 p., available only online at http://pubs.usgs.gov/of/2011/1309.



Contents

Introduction

Geochronology

References Cited


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