National Geochronological Database sample #3558

Core or cutting, Vein

Geographic location
-115.126667, 35.473333
115° 7' 36" W, 35° 28' 24" N
Clark county, NV
Crescent Peak 1:62,500 scale map quadrangle
Accurate to within 0.1 minute (~500 feet)
SW1/4 NE1/4 SEC. 35, T28S, R61E; SOUTH SLOPE OF CRESCENT PEAK; DIAMOND-DRILL CORE HOLE NO. 1, HOMESTAKE MINING CO., AT DEPTH OF 405-460 FT.
Source of sample Core or cutting
Rock name Vein
Description CRESCENT PEAK STOCKWORK VEINS. QUARTZ-PYRITE-MOLYBDENITE STOCKWORK VEINLETS IN A STOCK OF HIGHLY-ALTERED QUARTZ MONZONITE
Laboratories Geochron (Krueger of Cambridge, MA)
Compiler name Nichols, S.L.
Date compiled 1978 02
Precision of location Accurate to within 0.1 minute (~500 feet)
Location comment SW1/4 NE1/4 SEC. 35, T28S, R61E; SOUTH SLOPE OF CRESCENT PEAK; DIAMOND-DRILL CORE HOLE NO. 1, HOMESTAKE MINING CO., AT DEPTH OF 405-460 FT.
Bibliographic reference Krueger, H.W., and Schilling, J.H., 1971, Geochron-Nevada Bureau Of Mines K-Ar Age Determinations--List 1: Isochron/West, No. 1, p. 9-14.
(click for info)
Geologic map unit -115.126667, 35.473333
Nearby scientific data Find additional scientific data near this location

K-Ar age determinations

Age estimate 102.4 ± 3Ma
minimum age of intrusion
Type of analysis conventional K-Ar
Rock or mineral analyzed biotite
HYDROBIOTITE FROM MINERALIZING SOLUTIONS
Analytical details
Lab sample ID G-B0919/NBM-AD22
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 8.57 %
Radiogenic 40Ar concentration 13
Radiogenic Ar 92 %
Comments AGE OF MINERALIZATION, ALTERATION, AND INTRUSION