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Map showing publication footprint
  • Usage in publication:
    • Brougher dacite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Dacite
  • AAPG geologic province:
    • Great Basin province
Publication:

Spurr, J.E., 1905, Geology of the Tonopah mining district, Nevada: U.S. Geological Survey Professional Paper, 42, 295 p., (incl. geologic map, scale 1:16,000)


Summary:

Brougher dacite is recognized in Butler, Brougher, Siebert, and Golden mountains, Tonopah mining district, [Tonopah 7.5' quad, Nye and Esmeralda Cos, NV]. [Is probably named for Brougher Mountain, sec.2 T2N R24E, Tonopah 7.5' quad, Esmeralda Co, NV.] Intrudes earlier andesite, Fraction dacite breccia, Tonopah rhyolite dacite, Siebert tuff, and overlying basalt. Unit is brown porphyritic dacite; contains basalt inclusions in several places; flow structures present. Is apparently of about same age as Oddie rhyolite and of same nature and origin. Age is Tertiary.

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


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

Silberman, M.L., and McKee, E.H., 1972, A summary of radiometric age determinations on Tertiary volcanic rocks from Nevada and eastern California; Part II, Western Nevada: Isochron/West, no. 4, p. 7-28.


Summary:

Brougher Dacite. Age is modified based on K-Ar age of 16.2 +/-0.4 Ma (biotite) [old constant]. Age is Miocene.

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


Map showing publication footprint
  • Usage in publication:
    • Brougher Rhyolite*
  • Modifications:
    • Redescribed
    • Geochronologic dating
  • AAPG geologic province:
    • Great Basin province
Publication:

Garside, L.J., Bonham, H.F., Jr., Ashley, R.P., Silberman, M.L., and McKee, E.H., 1981, Radiometric ages of volcanic and plutonic rocks and hydrothermal mineralization in Nevada; determinations run under the USGS-NBMG cooperative program: Isochron/West, no. 30, p. 11-19.


Summary:

Brougher Rhyolite. Redescribed from Brougher Dacite [adopts redescription of unit by Bonham and Garside (1979)]. Age is Miocene, based on K-Ar age of 16.5 +/-0.5 Ma to 13.2 +/-0.4 Ma.

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


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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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