National Geochronological Database sample #18377

Mine, Quartz monzonite

Geographic location
-113.208333, 34.583333
113° 12' 30" W, 34° 35' " N
Yavapai county, AZ
Bagdad 1:24,000 scale map quadrangle
Accurate to within 0.1 minute (~500 feet)
Bagdad Copper Company open pit, Bagdad.
Source of sample Mine
Rock name Quartz monzonite
Description Quartz monzonite associated with a porphyry copper deposit
Laboratories University of Arizona
Compiler name Zartman, R.
Date compiled 1994 06
Precision of location Accurate to within 0.1 minute (~500 feet)
Location comment Bagdad Copper Company open pit, Bagdad.
Bibliographic reference Damon, P.E., and Mauger, R.L., 1966, Epeirogeny-orogeny viewed from the Basin and Range province: American Institute of Mining, Metallurgical and Petroleum Engineers (AIME) Transactions, v. 235, p. 99-112.
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Geologic map unit -113.208333, 34.583333
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K-Ar age determinations

Age estimate 70.9 ± 2.3Ma
age of intrusion
Type of analysis conventional K-Ar
Rock or mineral analyzed biotite
Analytical details
Lab sample ID PED-17-64
Decay constants 4.76E-04, 0.589E-04, 1.18E-04
K2O concentration 8.28 %
Radiogenic 40Ar concentration 8.82
Radiogenic Ar 78 %