Small mafic intrusive stocks

Diabase, diorite, pyroxenite, and gabbro; reversed magnetic polarity; includes the Esko and Tamarack intrusions emplaced into unit Pas (Slate and graywacke of Animikie Group).
State Minnesota
Name Small mafic intrusive stocks
Geologic age Mesoproterozoic
Lithologic constituents
Major
Igneous > Plutonic > Ultramafic > Pyroxenite (Stock or pipe)
Igneous > Hypabyssal > Mafic-hypabyssal (Diabase, Stock or pipe)
Igneous > Plutonic > Dioritic > Diorite (Stock or pipe)
Minor
Igneous > Plutonic > Gabbroic > Gabbro (Stock or pipe)
Comments Reversely polarized intrusions. Part of the Keweenawan Supergroup and Midcontinent Rift Intrusive Supersuite.
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 Aitkin - Carlton