Athelstane Quartz Monzonite (WIXgat;0)

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. (1836 +/- 15 Ma)

State	Wisconsin
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	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	Marinette

Athelstane Quartz Monzonite

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.