|Quadrangle map, 1:250,000-scale||SO|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the east coast of Golovin Bay. It is on a sea cliff 3.3 miles southeast of Golovin Mission and 4.1 miles northeast of Cape Darby. This is occurrence 136 of Cobb (1972, MF 445; 1978, OF 78-181).|
Geologic descriptionWest (1953) collected slope wash or detrital material from a small drainage at this locality. A heavy mineral concentrate obtained from the sample material (concentration ratio approximately 1,200:1) contained 0.049 percent equivalent uranium. The minerals identified in this concentrate included allanite, scheelite, monazite, fluorite, hematite, ilmentite, magnetite, epidote, biotite, and zircon. The bedrock here is an amphibolite facies, metasedimentary assemblage that forms a regional selvage between the Darby pluton to the east the the Kachauik pluton to the west (Miller and others, 1972; Till and others, 1986). The Darby pluton, is a large mid-Cretaceous granodiorite and granite body that has elevated background levels of uranium and thorium (Miller an Bunker, 1976; Johnson and others, 1979; Till and others, 1986). The Kachauik pluton is a composite syenite to granodiorite body, locally cut by nepheline syenite dikes, that is slightly older than the Darby pluton (99.9 +/- 3 Ma; Miller and others, 1972; Miller, 1972; Miller and Bunker, 1976). Parts of the Kachauik pluton contain U, Th, and REE mineralization near nepheline syenite dikes (Miller and others, 1976). Many of the minerals identified in the heavy mineral concentrate from this location are known accessory minerals in the Darby pluton.
|Geologic map unit||(-162.798575823382, 64.3842653759781)|
|Mineral deposit model||Disseminated; the heavy mineral concentrate is from a sample of detrital materials.|
|Age of mineralization||Mid-Cretaceous?; K/Ar ages for the Darby pluton are 88.3 +/- 1.5 and 92.8 +/- 2.6 Ma (Berry and others, 1976). A K/Ar age for the Kachauik pluton is 99.9 +/- 3 Ma (Miller and others, 1972; Miller and Bunker, 1976).|
|Workings or exploration||The reconnaissance sampling by West (1953) is the only work known in the area.|
|Indication of production||None|
Berry, A.L., Dalrymple, G.B., Lamphere, M.A., and Von Essen, J.C., and others, 1976, Summary of miscellaneous potassium-argon age measurements, U.S. Geological Survey, Menlo Park, California, for the years 1972-1974: U.S. Geological Survey Circular 727, 13 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Solomon quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-445, 1 sheet, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Solomon quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-181, 185 p.
Johnson, B.R., Miller, T.P., and Karl, Susan, 1979, Uranium-thorium investigations of the Darby pluton, Seward Peninsula, Alaska: U.S. Geological Survey Circular 804-B, p. B68-B70.
Miller, T.P., 1972, Potassium-rich alkaline intrusive rocks of western Alaska: Geological Society of America Bulletin, v. 83, p. 2111-2128.
Miller, T.P., and Bunker, C.M., 1976, A reconnaissance study of the uranium and thorium contents of plutonic rocks of the southeastern Seward Peninsula, Alaska: U.S. Geological Survey Journal of Research, v. 4, p. 367-377.
Miller, T.P., Elliott, R.L., Finch, W.I., and Brooks, R.A., 1976, Preliminary report on uranium-, thorium-, and rare-earth-bearing rocks near Golovin, Alaska: U.S. Geological Survey Open-File Report 76-710, 12 p.
Miller, T.P., Grybeck, D.J., Elliott, R.L., and Hudson, T.L., 1972, Preliminary geologic map of the southeastern Bendeleben and eastern Solomon quadrangles, eastern Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-256, 11 p., 1 sheet, scale 1:250,000.
Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||8/19/1999|