- Usage in publication:
-
- Toluca quartz monzonite
- Modifications:
-
- Named
- Dominant lithology:
-
- Quartz monzonite
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Name Toluca quartz monzonite is introduced in this report for monazite-bearing granitic rock, typically medium gray, moderately to strongly gneissic. Unit was included in Whiteside granite as mapped by Keith and Sterrett (1931: U.S. Geological Survey Bulletin 660-D, p. 130-132). Whiteside granite is herein restricted to area of its type locality. Considered older than Cherryville quartz monzonite (new). May be Carboniferous(?) or pre-Carboniferous(?).
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Toluca quartz monzonite*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Age determinations on zircon and monazite from granitic rocks, from associated bodies of pegmatites and quartz veins, and from enclosing schists and gneisses gave consistent early Ordovician (about 400 m.y.) date for zircon and monazite from Toluca quartz monzonite and enclosing metamorphosed sediments.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Toluca Quartz Monzonite
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Age of the Toluca changed from Early Ordovician to: Cambrian and Early Ordovician(?) based on isotopic date of 535 m.y. by Odom and Fullagar (1973). [Odom and Fullagar interpreted the Toluca to be of the same age as the Henderson Gneiss.]
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Toluca Quartz Monzonite*
- Modifications:
-
- Geochronologic dating
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Age of about 526 m.y. on zircon in Toluca Quartz monzonite.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Toluca Granite*
- Modifications:
-
- Redescribed
- Geochronologic dating
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Name Toluca Quartz Monzonite is here changed to Toluca Granite to conform to IUGS classification and nomenclature of igneous rocks. U-Pb and Rb-Sr isotopic data suggest ages ranging from 540 Ma to 445 Ma.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Toluca Granite*
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Toluca Granite here assigned to the newly named Table Rock Plutonic Suite in NC, which consists mainly of gneissic biotite granitoids and granitoid gneiss of probable Late Ordovician to Early Silurian age. All assignments to the Suite are tentative. In NC, in addition to the Toluca, they include the Dysartsville pluton, the Brooks Crossroads pluton, and the Sandy Mush pluton. The Toluca Granite is a medium-grained, gneissic to almost massive biotite monzogranite (and subordinate granodiorite) that forms concordant to semi-concordant masses in the region near Shelby, NC. Zircon ages of Wetherill (1962), which range from 405 Ma to 480+/-50 Ma are problematic, according to Odom and Fullagar (1973).
Source: GNU records (USGS DDS-6; Reston 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 ([ ]).