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  • Usage in publication:
    • Montevideo 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:

Present in southwest MN in Lake Superior region as part of the Lake Superior province gneiss terrane. Is a medium-grained, equigranular, leucocratic rock occurring as a gray granodioritic phase and as a red granitic phase. Age considered Early and Middle Archean. Regionally metamorphosed at 2,600 m.y. and intruded by mafic dikes and small pluton during the Early Proterozoic. Geologic map and correlation chart.

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


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