National Geochronological Database sample #15413

Core or cutting, Porphyry

Geographic location
-110.958333, 33.403333
110° 57' 30" W, 33° 24' 12" N
Gila county, AZ
Inspiration 1:24,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
DRILL HOLE SOUTH OF THE PINTO VALLEY PIT, GLOBE-MIAMI DISTRICT
Source of sample Core or cutting
Rock name Porphyry
Description UNALTERED, PORPHYRY PHASE OF THE SCHULTZE GRANITE
Laboratories USGS Menlo Park
Compiler name Marvin, R.F.
Date compiled 1984 11
Precision of location Accurate to within 1 minute (~1 mile)
Location comment DRILL HOLE SOUTH OF THE PINTO VALLEY PIT, GLOBE-MIAMI DISTRICT
Bibliographic reference Creasey, S.C., 1980, Chronology Of Intrusion and Deposition Of Porphyry Copper Ores, Globe-Miami District, Arizona: Economic Geology, v. 75, p. 830-844.
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Geologic map unit -110.958333, 33.403333
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K-Ar age determinations

Age estimate 64.4 ± 0.7Ma
Type of analysis conventional K-Ar
Rock or mineral analyzed biotite
Analytical details
Lab sample ID 9
Decay constants 4.962E-04, 0.581E-04, 1.1167E-04
Radiogenic 40Ar concentration 8.6417
Radiogenic Ar 69 %
Comments ROCK PROBABLY FORMED 60-65 M.Y. AGO