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Metagabbro

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Mafic to ultramafic bodies defined and delineated principally by positive magnetic and gravity anomalies; includes diorite bodies. Comagmatic with unit Xmi
State Michigan
Name Metagabbro
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Metaintrusive > Metagabbromafic to ultramafic bodies defined and delineated principally by positive magnetic and gravity anomalies; includes diorite bodies.
Igneous > Plutonic > Ultramaficmafic to ultramafic bodies defined and delineated principally by positive magnetic and gravity anomalies; includes diorite bodies.
Minor
Igneous > Plutonic > Dioritic > Dioritemafic to ultramafic bodies defined and delineated principally by positive magnetic and gravity anomalies; includes diorite bodies.
Comments This occurs as a sliver in northwestern Michigan, just south of the Niagara Fault zone (in the Pembine-Wausau terrane.)
References

Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Map I-2185, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i2185
NGMDB product
Counties Dickinson - Menominee