National Geochronological Database sample #13183

Mine, Granite

Geographic location
-167.156667, 65.475833
167° 9' 24" W, 65° 28' 33" N
AK
Teller B-5 1:63,360 scale map quadrangle
Accurate to within 1 minute (~1 mile)
LOST RIVER MINE DUMP, SEWARD PENINSULA
Source of sample Mine
Rock name Granite
Description FINE-GRAINED BIOTITE GRANITE CUPOLA
Laboratories USGS Reston
Compiler name Singh, P.
Date compiled 1983 07
Precision of location Accurate to within 1 minute (~1 mile)
Location comment LOST RIVER MINE DUMP, SEWARD PENINSULA
Bibliographic reference Hudson, T., and Arth, J.G., 1983, Tin Granites Of Seward Peninsula, Alaska: Geological Socetiy of America Bulletin, v. 94, p. 768-790.
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Geologic map unit -167.156667, 65.475833
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K-Ar age determinations

Age estimate 80.2 ± 2.9Ma
age of intrusion
Type of analysis conventional K-Ar
Rock or mineral analyzed biotite
Analytical details
Lab sample ID AK110
Decay constants 4.962E-04, 0.581E-04, 1.1167E-04
Radiogenic 40Ar concentration 10.3
Radiogenic Ar 69 %

Rb-Sr age determinations

Age estimate (no age estimate specified)
Rock or mineral analyzed whole rock
Analytical details
Lab sample ID AK110
Rubidium concentration 994 ppm
Strontium concentration 17.2 ppm
Initial 87Sr/86Sr 0.7055
Ratio 87Rb/86Sr 170.5
Ratio 87Sr/86Sr 0.8947
Normal? T