Gabbro, peridotite, pyroxenite, lamprophyre, and metamorphic equivalents

Gabbro, peridotite, pyroxenite, lamprophyre, and metamorphic equivalents. Includes the Oaks intrusion (~2,671 Ma) in the Wabigoon subprovince, and a ~2,639 Ma lamprophyre in the western Wawa subprovince; locally defined by variably high gravity and magnetic signatures.
State Minnesota
Name Gabbro, peridotite, pyroxenite, lamprophyre, and metamorphic equivalents
Geologic age Neoarchean
Lithologic constituents
Major
Igneous > Plutonic > Gabbroic > Gabbro (Pluton)
Igneous > Plutonic > Ultramafic > Peridotite (Pluton)
Igneous > Plutonic > Ultramafic > Pyroxenite (Pluton)
Incidental
Metamorphicmetamorphic equivalents
Igneous > Hypabyssal > Lamprophyre (Dike or sill)
Comments Intrusions in all subprovinces of the Superior Province. Part of generally discrete, unfoliated to weakly magmatically foliated or lineated plutons.
References

Jirsa, Mark A., Boerboom, Terrence J., Chandler, Val W., Mossler, John H., Runkel, Anthony C., and Setterholm, Dale R., 2011, S-21 Geologic Map of Minnesota-Bedrock Geology; Minnesota Geological Survey, State Map Series S-21. Scale 1:500,000.

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Counties Becker - Beltrami - Cass - Chippewa - Clay - Clearwater - Crow Wing - Douglas - Grant - Hubbard - Itasca - Kandiyohi - Koochiching - Lake - Lake of the Woods - Marshall - Norman - Otter Tail - Pennington - Polk - Roseau - Saint Louis - Todd - Wilkin