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Geologic Units: Deer Lake
Map showing publication footprint
  • Usage in publication:
    • Deer Lake Complex
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Peridotite
    • Clinopyroxenite
    • Gabbro
    • Diorite
  • AAPG geologic province:
    • Sioux uplift
Publication:

Berkley, J.L., and Himmelberg, G.R., 1978, Cumulus mineralogy and petrology of the Deer Lake Complex, Itasca County, Minnesota, IN Berkley, J.L., and others, Geology of the Deer Lake Complex, Itasca County, Minnesota: Minnesota Geological Survey Report of Investigations, no. 20-A, A1-A18.


Summary:

Three layered sills, each intruded along upper contact of previous one; each magma injection fractionated into sequence of ultramafic to dioritic rocks. Thickness 430 m. Conformably intrudes early Precambrian metabasalt and metasedimentary rocks; cut by middle Precambrian(?) gabbroic dikes. Age is Precambrian.
Type locality: northeast-trending band 10 km long and 2.5 km wide, in T. 61 and 62 N., R. 24 and 25 W., 4 km southwest of Deer Lake and 6.5 km northeast of Bigfork, Itasca Co., north-central MN.

Source: US geologic names lexicon (USGS Bull. 1564, p. 44).


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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