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Geologic Unit: Oonatut
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Map showing publication footprint
  • Usage in publication:
    • Oonatut Granite Complex*
  • Modifications:
    • Named
  • Dominant lithology:
    • Granite
  • AAPG geologic province:
    • Alaska West-Central region
Publication:

Hudson, T.L., 1979, Igneous and metamorphic rocks of the Serpentine Hot Springs area, Seward Peninsula, Alaska: U.S. Geological Survey Professional Paper, 1079, 27 p.


Summary:

Named for Eskimo word for "place where hot water exists". Type locality designated as Serpentine Hot Springs area in headwater region of Serpentine River, Bendeleben D-6 and D-5 quads, north-central Seward Peninsula, AK. Composed of gray biotite granite which forms stock and peripheral dikes with tin mineralization. Exposed over area of 70 sq km and to deeper levels than any other tin granites in belt. Intrudes unnamed Precambrian(?) and Paleozoic metamorphic rocks with sharp, discordant contact. Is Late Cretaceous age on basis of K-Ar ages of 69.4 +/2 and 67.5 +/-2 Ma (M.A. Lanphere).

Source: GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Oonatut Complex
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Alaska West-Central region
Publication:

Armstrong, R.L., Harakal, J.E., Forbes, R.B., Evans, B.W., and Thurston, S.P., 1986, Rb-Sr and K-Ar study of metamorphic rocks of the Seward Peninsula and southern Brooks Range, Alaska, IN Evans, B.W., and Brown, E.H., eds., Blueschists and eclogites: Geological Society of America Memoir, Bellingham, WA, September, 1983, 164, p. 185-203.


Summary:

Sketch map of Seward Peninsula shows Oonatut Complex isotopic ages to be 71.2 +/-2.0 and 69.2 +/-2.0 Ma.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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