Mafic to ultramafic hypabyssal intrusive complexes composed of gabbro, pyroxenite, diorite, and anorthosite

Mafic to ultramafic hypabyssal intrusive complexes composed of gabbro, pyroxenite, diorite, and anorthosite. Includes the Mentor and Deer Lake complexes, intrusions of the Newton Lake Formation, all within the Wawa subprovince; and the UBD intrusion (~2,685 to 2,695 Ma) in the Wabigoon subprovince.
State Minnesota
Name Mafic to ultramafic hypabyssal intrusive complexes composed of gabbro, pyroxenite, diorite, and anorthosite
Geologic age Neoarchean
Lithologic constituents
Major
Igneous > Plutonic > Ultramafic > Pyroxenite (Stock or pipe)
Igneous > Plutonic > Dioritic > Diorite (Stock or pipe)
Igneous > Plutonic > Gabbroic > Gabbro (Stock or pipe)
Minor
Igneous > Plutonic > Anorthosite (Stock or pipe)
Comments Part of the Supracrustal and hypabyssal intrusive rocks of the Wawa and Wabigoon subprovinces. Pre-D1 metavolcanic, metasedimentary, and hypabyssal intrusive rocks.
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 Itasca - Koochiching - Lake - Lake of the Woods - Norman - Polk - Saint Louis