Mafic metavolcanic rocks (WIXmi;0)

Mafic metavolcanic rocks

Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.

State	Wisconsin
Name	Mafic metavolcanic rocks
Geologic age	Early Proterozoic
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Pyroclastic-tuff)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation. Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow, Pyroclastic-tuff)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation. Minor Metamorphic > Metaigneous > Metaintrusive > MetagabbroDominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation. Igneous > Plutonic > Ultramafic (Flow)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.
Comments	Pembine-Wausau terrane
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	Barron - Florence - Forest - Iron - Langlade - Lincoln - Marathon - Marinette - Oneida - Price - Rusk - Sawyer - Taylor - Vilas