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Rb-Sr age for the Robertson River pluton in Virginia and its implication on the age of the Catoctin Formation

Douglas G. Mose
Douglas G. Mose
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Susan Nagel
Susan Nagel
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January 01, 1984

The Robertson River pluton is a granitic pluton that intruded Grenville rocks in the Blue Ridge province of western Virginia. Rb-Sr whole-rock analyses show that the pluton was intruded at 570 ± 15 m.y. ago with a relatively high initial 87Sr/86Sr ratio of 0.712. The Robertson River pluton and the Grenville host rocks are cut by numerous metabasalt dikes that are probably feeder dikes related to the Catoctin Formation, a widespread plateau basalt that once covered this part of the Blue Ridge. The cross-cutting relationship of the metabasalt dikes to the Robertson River pluton considered along with the early Cambrian age of the Chilhowee Group, which overlies the Catoctin Formation, indicate that the Catoctin Formation was extruded at a time close to the Precambrian-Cambrian boundary at about 570 m.y. ago.

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GSA Special Papers

The Grenville Event in the Appalachians and Related Topics

Mervin J. Bartholomew
Mervin J. Bartholomew
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Geological Society of America
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Publication date:
January 01, 1984



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