Mineral Resources On-Line Spatial Data
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Geologic units in Price county, Wisconsin
- Biotite schist (Early Proterozoic) at surface, covers 14 % of this area
Biotite schist - Metamorphosed graywacke in poorly exposed areas in northwestern Wisconsin. Sample at one locality (near Blockhouse Lake, 10 km northeast of Park Falls, T. 40 N., R. 1 E.) has a U-Pb zircon age of 1852 +/- 6 Ma (Sims and others, 1985b)
- Migmatitic gneiss and amphibolite (Late to Early Archean) (Archean) at surface, covers 2 % of this area
Migmatitic gneiss and amphibolite (Late to Early Archean) - Varied gneisses of mostly unknown age in cores of gneiss domes and fault-bounded uplifts (Archean gneiss terranes). Except for the Watersmeet dome (Late to Early Archean), all dated rocks are Late Archean. Includes granite of Late Archean age that transgresses gneisses and amphibolite.
- Mafic metavolcanic rocks (Early Proterozoic) at surface, covers 34 % of this area
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.
- Mafic to felsic metavolcanic rocks (Early Proterozoic) at surface, covers 22 % of this area
Mafic to felsic metavolcanic rocks - Volcanic rocks in areas of sparse geologic data and nondefinitive magnetic and gravity data
- Granitic rocks of 1760-Ma age group (Early Proterozoic) at surface, covers 6 % of this area
Granitic rocks of 1760-Ma age group - In northern Wisconsin, granite to granodiorite of varied texture. In southern Wisconsin (not mapped separately), red to pink alkali-feldspar granophyric granite associated with rhyolites of both peraluminous and metaluminous affinities (unit Xr of Marshfield terrane).
- Metagabbro (Early Proterozoic) at surface, covers 2 % of this area
Metagabbro - Mafic to ultramafic bodies defined and delineated principally by positive magnetic and gravity anomalies; includes diorite bodies. Comagmatic with unit Xmi
- Granite-tonalite (Early Proterozoic) at surface, covers 20 % of this area
Granite-tonalite - Gray to pinkish-gray, medium-grained, generally equigranular granite to tonalite and granitoid gneiss; locally includes diorite. Intrudes older metavolcanic rocks. Zircon ages range from 1852 +/- 15 to 1862 +/- 5 Ma
- Quartz diorite (Early Proterozoic) at surface, covers 0.7 % of this area
Quartz diorite - Includes Marinette Quartz Diorite of Dunbar Dome (Sims and others, 1985a) and nearby Twelve Foot Falls Quartz Diorite