Athelstane Quartz Monzonite

Pink, coarse-grained granite to granodiorite containing nearly equal amounts of microcline microperthite, plagioclase, and quartz and 5-10 percent biotite and (or) hornblende. Mafic minerals are interstitial and give a clotty appearance.
State Michigan
Name Athelstane Quartz Monzonite
Geologic age Early Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granodiorite (Stock or pipe)Pink, coarse-grained granite to granodiorite containing nearly equal amounts of microcline microperthite, plagioclase, and quartz and 5-10 percent biotite and (or) hornblende. Mafic minerals are interstitial and give a clotty appearance. (1836 +- 15 Ma)
Igneous > Plutonic > Granitic > Granite (Stock or pipe)Pink, coarse-grained granite to granodiorite containing nearly equal amounts of microcline microperthite, plagioclase, and quartz and 5-10 percent biotite and (or) hornblende. Mafic minerals are interstitial and give a clotty appearance. (1836 +- 15 Ma)
Comments Pembine-Wausau terrane. This unit mostly occurs in Wisconsin but also occurs as a thin sliver in nortwestern Michigan.
References
NGMDB product
Counties Menominee