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Geologic Unit: McGinty
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Map showing publication footprint
  • Usage in publication:
    • McGinty Monzogranite*
  • Modifications:
    • Named
    • Geochronologic dating
  • Dominant lithology:
    • Monzogranite
  • AAPG geologic province:
    • Great Basin province
Publication:

Miller, D.M., Hillhouse, W.C., Zartman, R.E., and Lanphere, M.A., 1987, Geochronology of intrusive and metamorphic rocks in the Pilot Range, Utah and Nevada, and comparison with regional patterns: Geological Society of America Bulletin, v. 99, no. 6, p. 866-879.


Summary:

Named for exposures along McGinty Ridge in sec 26, T6N, R19W, Crater Island NW 7.5 quad, Box Elder Co, UT in the Great Basin province. Previously designated granodiorite of Patterson Pass. Crops out over about 18 sq km along east side of Pilot Range in UT and at two localities on west side of range in NV. Is texturally and compositionally homogeneous. Composed of unfoliated porphyritic biotite monzogranite to granodiorite. Pink zoned potassium feldspar phenocrysts less than 3 cm in diameter are set in a pale-gray groundmass of coarse-grained plagioclase, potassium feldspar, quartz, and biotite. Accessory minerals include hornblende, zircon, sphene, apatite, xenotime(?). Is a pluton with pink aplite and pegmatite dikes. Has a biotite K-Ar date of 36.6 +/-0.5 Ma. This date is considered a minimum crystallization age. Considered Eocene or Oligocene age. Geologic map. Isotopic data.

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


Map showing publication footprint
  • Usage in publication:
    • McGinty Monzogranite*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Great Basin province
Publication:

Miller, D.M., Lush, A.P., and Schneyer, J.D., 1993, Geologic map of the Patterson Pass quadrangle, Box Elder County, Utah and Elko County, Nevada: Utah Geological Survey Map, M-144, 2 sheets, 20 p., scale 1:24,000


Summary:

Age of McGinty Monzogranite is latest Eocene on the basis of a radiometric age of about 38 or 39 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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