Main commodities | Cu |
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Other commodities | Ag; Zn |
Ore minerals | chalcopyrite; pyrrhotite; pyrite; sphalerite |
Quadrangle map, 1:250,000-scale | LC |
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Quadrangle map, 1:63,360-scale | D-2 |
Latitude | 60.96 |
Longitude | -153.51 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | About 3 km northwest of Telaquana Pass, on a mountain peak surrounded by glaciers. Locality 38 of MacKevett and Holloway (1977). Sec. 15, T. 10 N., R. 24 W., of the Seward Meridian. Location accurate within 1.6 km. |
Geologic descriptionSkarn deposit; marble interbedded with schist, phyllite, and metamorphosed mafic volcanic rocks in a large roof pendant in granitic rocks (Nelson and others, 1983). Mineralization consists of pyrite, pyrrhotite and minor amounts of chalcopyrite and sphalerite in granitic rocks and in metasedimentary roof pendants (MacKevett and Holloway, 1977). Quite similar to the nearby Glacier Fork occurrence (ARDF number LC008) and another unnamed occurrence (ARDF number LC010). According to Nelson and others (1983, unit MzPzm), some of the metasedimentary rocks may correlate with the Kakhonak Complex of Permian(?), Triassic, and Jurassic age in the Iliamna quadrangle, and some may be graywacke of Jurassic and Cretaceous (?) age that has been metamorphosed by nearby plutonic rocks. Some of the metamorphosed volcanic rocks, especially in roof pendants, are probably part of the volcanic rocks of Tertiary age (Tv). Nelson and others (1983, unit Ti16) describe the granitic rocks as medium-gray, medium-grained biotite-hornblende granodiorite. Potassium-argon dates on biotite and hornblende from one specimen of this unit yielded ages of about 31 to 35 m.y. (Reed and Lanphere, 1972; 1973). | |
Geologic map unit | (-153.51226607024, 60.9593463103257) |
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Mineral deposit model | Porphyry Cu or Cu skarn (Cox and Singer, 1986; model 17 or 18b) |
Mineral deposit model number | 17 or 18b |
Age of mineralization | The granodiorite that produced the skarn has potassium-argon dates on biotite and hornblende of about 31 to 35 m.y. (Reed and Lanphere, 1972; 1973). |
Indication of production | None |
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Additional commentsSite is in Lake Clark National Park and Preserve. |
MRDS Number | A106365 |
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ReferencesReed, B.L., and Lanphere, M.A., 1973, Alaska-Aleutian Range batholith: Geochronology, chemistry, and relation to circum-Pacific plutonism: Geological Society of America Bulletin, v. 84, no. 8, p. 2583-2609.
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Reporters | D.P. Bickerstaff (USGS) |
Last report date | 6/15/1998 |