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

State	Michigan
Name	Migmatitic gneiss and amphibolite (Late to Early Archean)
Geologic age	Archean
Lithologic constituents	Major Metamorphic > AmphiboliteVaried 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 > GneissVaried 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 > MigmatiteVaried 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.
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 71888 NGMDB product page for 71887
Counties	Baraga - Dickinson - Gogebic - Iron - Marquette

State

Name

Migmatitic gneiss and amphibolite (Late to Early Archean)

Geologic age

Archean

Lithologic constituents

Major

Metamorphic > AmphiboliteVaried 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 > GneissVaried 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 > MigmatiteVaried 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.

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 71888

NGMDB product page for 71887

Counties

Baraga - Dickinson - Gogebic - Iron - Marquette