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  • Usage in publication:
    • Huachuca Quartz Monzonite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Quartz monzonite
  • AAPG geologic province:
    • Pedregosa basin
Publication:

Hayes, P.T., 1967, Huachuca Quartz Monzonite, Huachuca Mountains, Cochise County, Arizona, IN Hayes, P.T., Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1966: U.S. Geological Survey Bulletin, 1254-A, p. A1-A29.


Summary:

Named for extensive exposures in southern part of Huachuca Mountains, Cochise Co, AZ in the Pedregosa basin which are designated as type area. Is a medium- to coarse-grained, equigranular rock consisting of equal proportions of pink orthoclase, white plagioclase, and gray quartz. Biotite and hornblende are present. Intrudes limestones of Permian age and apparently intrudes lower Mesozoic volcanic rocks. Overlain by Glance Conglomerate. Is of Jurassic? age.

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


Map showing publication footprint
  • Usage in publication:
    • Huachuca Quartz Monzonite*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Pedregosa basin
Publication:

Hayes, P.T., 1970, Mesozoic stratigraphy of the Mule and Huachuca Mountains, Arizona, IN Mesozoic stratigraphy in southeastern Arizona: U.S. Geological Survey Professional Paper, 658-A, p. A1-A28. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp658A]


Summary:

Assigned a Jurassic age on basis of potassium-argon age of 164 +/-6 m.y. Is in the Pedregosa basin. Is of Jurassic age.

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


Map showing publication footprint
  • Usage in publication:
    • Huachuca Quartz Monzonite*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Pedregosa basin
Publication:

Marvin, R.F., Naeser, C.W., and Mehnert, H.H., 1978, Tabulation of radiometric ages (including unpublished K/Ar and fission-track ages) for rocks in southeastern Arizona and southwestern New Mexico, IN Callender, J.F., Wilt, J.C., and Clemons, R.E., eds., Land of Cochise, southeastern Arizona: New Mexico Geological Society Field Conference Guidebook, no. 29, p. 243-252.


Summary:

Sample collected from Huachuca Quartz Monzonite. K-Ar age on biotite 167+/-6 Ma.

Source: Modified from 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 ( ).

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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