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Geologic Unit: Sartell
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  • Usage in publication:
    • Sartell Gneiss
  • Modifications:
    • Named
  • Dominant lithology:
    • Gneiss
  • AAPG geologic province:
    • Lake Superior region
Publication:

Morey, G.B., 1978, Lower and middle Precambrian stratigraphic nomenclature for east-central Minnesota: Minnesota Geological Survey Report of Investigations, no. 21, 52 p.


Summary:

Is part of Sauk Rapids Metamorphic Complex (new). Named for exposures just north of village of Sartell on east side of Mississippi River in Benton Co, east-central MN, Lake Superior region. Type locality designated in SW1/4 sec 4 of T36N, R30W. Other reference exposures occur in SW1/4 and NW1/4 sec 6, T125N, R28W. Geophysical data suggests gneiss extends west beneath Phanerozoic cover to at least vicinity of Long 95 deg West. Is truncated on east by reddish-gray, porphyritic granite of possible Stearns Granitic Complex. Sartell Gneiss consists of interlayered light-pinkish-gray quartzose feldspathic gneiss and light- to dark-brownish-gray garnet- and cordierite-bearing biotite gneiss. Biotite-bearing phase is highly variable in grain size and mineralogy, but consists of two facies: 1) brownish-gray, medium-grained, well-foliated rock having irregular clots and lenses of coarser grained granular material; and 2) brownish-gray, medium-grained, moderately massive gneiss. Is locally interlayered with Watab Amphibolite (new) and St. Wendel Metagabbro (new). Is early Precambrian in age.

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


Map showing publication footprint
  • Usage in publication:
    • Sartell Gneiss*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Lake Superior region
Publication:

Morey, G.B., and Van Schmus, W.R., 1988, Correlation of Precambrian rocks of the Lake Superior region, United States, IN Harrison, J.E., and Peterman, Z.E., eds., Correlation of Precambrian rocks of the United States and Mexico: U.S. Geological Survey Professional Paper, 1241-F, p. F1-F31.


Summary:

Is one of several gneisses present in the Lake Superior province, east-central MN in the Lake Superior region. Metamorphosed to upper amphibolite or granulite facies and deformed into gentle folds. Has not been dated radiometrically, but resembles Early or Middle Archean-aged rocks in the Minnesota River Valley.

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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