Porphyritic granite

Granite containing plagioclase, microcline, and quartz phenocrysts in a fine-grained granophyric matrix. Probably subvolcanic intrusions related to volcanic rocks of 1835- to 1845-Ma age group
State Wisconsin
Name Porphyritic granite
Geologic age Early Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granite (Stock or pipe)Granite containing plagioclase, microcline, and quartz phenocrysts in a fine-grained granophyric matrix. Probably subvolcanic intrusions related to volcanic rocks of 1835- to 1845-Ma age group
Comments Pembine-Wausau terrane
References
NGMDB product
Counties Langlade - Marathon