U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Bokan Mountain Granite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Granite
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

MacKevett, E.M., Jr., 1963, Geology and ore deposits of the Bokan Mountain uranium-thorium area, southeastern Alaska: U.S. Geological Survey Bulletin, 1154, 125 p., (incl. geologic map, scale 1:24,000)


Summary:

[Named for Bokan Mountain, southern Prince of Whales Island southeastern AK] [no type designated]. Composed of a small stock or boss of white to light gray riebeckite- and or acmite-bearing peralkaline granite that is rich in silica. Ranges from fine to coarse grained, and textures include porphyritic, seriate porphyritic, protoclastic, cataclastic, hypidiomorphic granular, and xenomorphic granular. Intrudes unnamed slate on hill 2302, on southwest flank of Bokan Mountain. Age is Cretaceous(?) and Tertiary(?).

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


Map showing publication footprint
  • Usage in publication:
    • Bokan Mountain Granite*
  • Modifications:
    • Age modified
    • Geochronologic dating
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Lanphere, M.A., and MacKevett, E.M., Jr., 1964, Potassium-argon and lead-alpha ages of plutonic rocks, Bokan Mountain area, Alaska: Science, v. 145, no. 3633, p. 627-752.


Summary:

Age is Late Triassic or Early Jurassic based on K-Ar ages of 186 +/-8 and 181 +/-8 Ma on riebeckite samples collected on Bokan Mountain.

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


Map showing publication footprint
  • Usage in publication:
    • Bokan Mountain Granite*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Gehrels, G.E., and Saleeby, J.B., 1987, Geology of southern Prince of Wales Island, southeastern Alaska: Geological Society of America Bulletin, v. 98, no. 2, p. 123-137.


Summary:

Shown on geologic sketch map of southern Prince of Whales Island as Jurassic. K-Ar age determination gives 190 +/-8 and 185 +/-8 Ma in riebeckite (arfvedsonite?) samples (Lanphere, 1964). Rb/Sr analyses from 10 whole rock samples of granite gives 151 +/-5 Ma (Armstrong, 1985). Geochronologic data suggest Jurassic age.

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


Map showing publication footprint
  • Usage in publication:
    • Bokan Mountain Granite*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • laska Southeastern region
Publication:

Gehrels, G.E., 1992, Geologic map of southern Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2169, 1 sheet, 23 p., scale 1:63,360


Summary:

Age of the Bokan Mountain Granite is revised from Late Triassic or Early Jurassic to: Jurassic based of based on radiometric age data.

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


Search archives

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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 04:19:46 PM MDT