Paleoproterozoic weathering beneath mature quartzites

Region Central, North Central
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Focus areas shows the areal extent of the Baraboo, Waterloo, Sioux, and Barron Quartzites, where Paleoproterozoic weathering older than 1.7 Ga may be preserved as in situ regolith at the unconformity.
Identified resources Unknown.
Production Unknown.
Status Unknown.
Estimated resources Unknown.
Geologic maps Horton and others (2017), scale 1:500,000; sporadic 1:24,000 scale geologic mapping.
Geophysical data Adequate aeromagnetic coverage in Minnesota, inadequate in Wisconsin and SD; inadequate aeroradiometric coverage.
Favorable rocks and structures Paleoproterozoic paleoweather profile beneath mature quartzite units.
Deposits No data.
Evidence from mineral occurrences No data.
Geochemical evidence Potential for chemically extractable REE.
Geophysical evidence No data.
Evidence from other sources In-situ paleoweathering profiles preserved between older Precambrian and Paleoproterozoic rocks and younger Paleoproterozoic mature quartzites.
Comments Regolith recognized from sparse outcrop and drilling.
Cover thickness and description Quartzites are exposed; paleoweathering horizon preserved beneath quartzites.
Authors Laurel G. Woodruff, Suzanne W. Nicholson, Esther K. Stewart.
New data needs New mapping.
Geologic mapping and modeling needs Surficial mapping at 1:24:000 scale.
Geophysical survey and modeling needs None.
Digital elevation data needs Lidar inadequate.