National Geochronological Database sample #14505

Quarry, Greisen

Geographic location
-79.165278, 37.85
79° 9' 55" W, 37° 51' " N
Rockbridge county, VA
Montebello 1:24,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
OPEN WORKINGS OF PANTHER RUN, IRISH CREEK TIN DISTRICT, WESTERNMOST FLANK OF BLUE RIDGE
Source of sample Quarry
Rock name Greisen
Description FINE-GRAINED QUARTZ-MUSCOVITE GREISEN
Laboratories University of Georgia
Compiler name Marvin, R.F.
Date compiled 1984 05
Precision of location Accurate to within 1 minute (~1 mile)
Location comment OPEN WORKINGS OF PANTHER RUN, IRISH CREEK TIN DISTRICT, WESTERNMOST FLANK OF BLUE RIDGE
Bibliographic reference Hudson, T.A., and Dallmeyer, R.D., 1982, Age of mineralized greisens in the Irish Creek tin district, Virginia Blue Ridge: Economic Geology, v. 77, p. 189-192.
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Geologic map unit -79.165278, 37.85
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K-Ar age determinations

Age estimate 637 ± 11Ma
Type of analysis 39Ar-40Ar incremental (plateau)
SEE ARTICLE FOR 40-39AR ANALYTICAL DATA
Rock or mineral analyzed muscovite
Analytical details
Lab sample ID SAMPLE 2
Decay constants 4.962E-04, 0.581E-04, 1.1167E-04
Comments THE TIME OF FORMATION OF THE GREISEN AND PROBABLE GRANITE EMPLACEMENT