|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site is a 7-mile-long belt that extends southwest from the head of North Creek, into the Anchorage quadrangle. The coordinates are at about the center of this belt which is near the center of sec. 1, T. 22 N., R. 11 E., Seward Meridian. The location is accurate. This is locality 112 of Csejtey and Miller (1978).|
Geologic descriptionThis deposit is a 7-mile-long belt that consists of zeolite minerals in the Lower Jurassic, Talkeetna Formation (Csejtey and others, 1978). The deposit consists of flat-lying, normally graded, zeolitized tuff beds interlayered with lava flows. The zeolite minerals are analcime, heulandite, laumontite, and mordenite; they are accompanied by calcite, feldspar, montmorillonite, and quartz. The mordenite content ranges from 26 to 72 percent, and averages 49 percent (Hawkins, 1976). According to Hawkins, this deposit is of economic size and grade and warrants development.
|Geologic map unit||(-147.356400994842, 62.0236906804909)|
|Age of mineralization||Jurassic.|
|Alteration of deposit||Zeolitization of tuff beds.|
|Workings or exploration||Only surface examination.|
|Indication of production||None|
Cobb, E.H., and Csejtey, Bela, Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-716, 63 p.
Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and table describing metalliferous and selected nonmetalliferous mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-B, 22 p., 1 sheet, scale 1:250,000.
Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000.
Hawkins, D.B., 1976, Commercial-grade mordenite deposits of the Horn Mountains, southcentral Alaska: Alaska Division of Geological and Geophysical Surveys Special Report 11, 11 p., 1 sheet, scale 1:15,840.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/2/2002|