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Geologic Unit: Jualin
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Map showing publication footprint
  • Usage in publication:
    • Jualin diorite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Diorite
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Knopf, Adolph, 1911, Geology of the Berners Bay region, Alaska: U.S. Geological Survey Bulletin, 446, 58 p., (incl. geologic map, scale 1:62,500)


Summary:

Occurs at Jualin, Berners Bay region, southeastern AK. Occupies drainage area of Johnson Creek and upper part of Sherman Creek. Diorite is finely granular, as at Jualin, to coarsely granular, as at Kensington mine. Hornblende and biotite are ferromagnesium minerals. Allotriomorphic orthoclase and interstitial quartz are present in subordinate amounts, although as at Jualin mine, they are sufficiently abundant to approach granodiorite. Intrudes Berners formation (new). Map legend shows age as Early Cretaceous(?).

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


Map showing publication footprint
  • Usage in publication:
    • Jualin Diorite*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Gehrels, G.E., and Berg, H.C., 1992, Geologic map of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1867, 1 sheet, 24 p., scale 1:600,000


Summary:

Age is Triassic and (or) Jurassic. Unit is overlain by Jurassic and Cretaceous sedimentary rocks.

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


Map showing publication footprint
  • Usage in publication:
    • Jualin Diorite*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska Southeastern region
Publication:

Miller, L.J., Goldfarb, R.J., Snee, L.W., Gent, C.A., and Kirkham, R.A., 1995, Structural geology, age, and mechanisms of gold vein formation in the Kensington and Jualin deposits, Berners Bay district, southeast Alaska: Economic Geology, v. 90, no. 2, p. 343-368.


Summary:

Age of the Jualin Diorite is modified from Triassic and (or) Jurassic to: late Early Cretaceous based on radiometric dates of 106 Ma (Ar40/Ar39) and 105 Ma (U/Pb).

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


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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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