Eastern Piedmont Devonian granitoids

Region East, Northeast
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Accessory allanite reported within intrusions; minor historical potash and beryl mining.
Identified resources Historical production of beryllium (beryl) and potash.
Production Unknown.
Status Past mining.
Estimated resources Unknown.
Geologic maps Horton and others (2017), scale 1:500,000.
Geophysical data Inadequate Rank 3 to 4 aeromagnetic and Rank 4 aeroradiometric coverage.
Favorable rocks and structures Pegmatite.
Deposits Unknown.
Evidence from mineral occurrences Critical mineral potential inferred from the mineral system/deposit type table (Hofstra and Kreiner, 2020).
Geochemical evidence Unknown.
Geophysical evidence Unknown.
Evidence from other sources Unknown.
Comments Deposits well exposed throughout central Piedmont in Maryland.
Cover thickness and description Variable cover and saprolite, some urban areas.
Authors William Junkin, Rebecca Kavage Adams, David K. Brezinski.
New data needs Geophysical data, geologic mapping, and geochemical analyses.
Geologic mapping and modeling needs Some 1:24,000 scale mapping exists, but incomplete.
Geophysical survey and modeling needs High resolution aeromagnetic data would help delineate framework geology.
Digital elevation data needs Lidar complete.