State | Minnesota |
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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. |
NGMDB product | |
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 |