Migmatitic gneiss and amphibolite (Late to Early Archean) (WIAgn;0)

Migmatitic gneiss and amphibolite (Late to Early Archean)

Varied gneisses of mostly unknown age in cores of gneiss domes and fault-bounded uplifts (Archean gneiss terranes). Except for the Watersmeet dome (Late to Early Archean), all dated rocks are Late Archean. Includes granite of Late Archean age that transgresses gneisses and amphibolite.

State	Wisconsin
Name	Migmatitic gneiss and amphibolite (Late to Early Archean)
Geologic age	Archean
Lithologic constituents	Major Metamorphic > GneissMigmatitic gneiss. Varied gneisses of mostly unknown age in cores of gneiss domes and fault-bounded uplifts (Archean gneiss terranes). Except for the Watersmeet dome (Late to Early Archean); all dated rocks are Late Archean. Includes granite of Late Archean age that transgresses gneisses and amphibolite. Metamorphic > AmphiboliteMigmatitic amphibolite Minor Igneous > Plutonic > Granitic > GraniteIncludes granite of Late Archean age that transgresses gneisses and amphibolite.
Comments	Continental margin assemblage (north of Niagara Fault)
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	NGMDB product page for 10177 NGMDB product page for 49339
Counties	Ashland - Bayfield - Iron - Price - Sawyer - Vilas - Washburn

Migmatitic gneiss and amphibolite (Late to Early Archean)

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.