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Geologic Unit: Rattler
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Map showing publication footprint
  • Usage in publication:
    • Rattler Granodiorite*
  • Modifications:
    • Named
    • Geochronologic dating
  • Dominant lithology:
    • Quartz diorite
  • AAPG geologic province:
    • Basin-and-Range province
Publication:

Cornwall, H.R., Banks, N.G., and Phillips, C.H., 1971, Geologic map of the Sonora quadrangle, Pinal and Gila Counties, Arizona: U.S. Geological Survey Geologic Quadrangle Map, GQ-1021, 1 sheet, scale 1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_10566.htm]


Summary:

Named for exposures at Rattler mine, sec 26, T3S, R14E, its type locality, Pinal Co, AZ in Basin-and-Range province. Ranges from quartz diorite to sodic granite aplite. Main type is granodiorite, granitic in texture, and in composition except that hornblende and biotite vary. Is a pear shaped stock. Cuts Paleozoic sedimentary rocks. Is cut by many of the Laramide dikes. K-Ar age determinations give an age of 70 +/-2 m.y. for biotite and 74 +/-2 m.y. for hornblende. Geologic map.

Source: GNU records (USGS DDS-6; Denver 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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