Tonalite

Tonalite. Locally migmatitic, variably magnetic; contains abundant biotite schist paleosome of graywacke protolith (presumably derived from the Little Falls Formation, unit Pls).
State Minnesota
Name Tonalite
Geologic age Paleoproterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Tonalite (Stock or pipe)
Comments Part of the Hillman tonalite. Part of the Geon 17 post-tectonic (post-Penokean orogeny) intrusions related to the Yavapai orogeny.
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 Mille Lacs - Morrison