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  • Usage in publication:
    • American Creek Granite
  • Modifications:
    • Named
  • Dominant lithology:
    • Granite
  • AAPG geologic province:
    • Alaska West-Central region
Publication:

Herreid, Gordon, 1966, The geology and geochemistry of the Inmachuk River map area, Seward Peninsula, Alaska: Alaska Division of Mines and Minerals Geological Report, no. 23, 25 p.


Summary:

Inmachuk map area covers 110 sq mi in northern Seward Peninsula, 10 mi north of Kotzebue Sound and 25 mi southwest of Deering, Seward Peninsula, AK. [no type designated] Two types of granite are described: Asses Ears and American Creek (both new). American Creek is medium-grained, subhedral granular granite composed of perthitic orthoclase, oligoclase, biotite, and minor sphene. Alteration limited to minor seritization of oligoclase and chloritization of albite. Granite is surrounded by narrow contact metamorphic aureole no more than few tens of feet wide. Is Mesozoic(?) age.

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 ( ).

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