Devonian Marcellus black shale

Region East, Northeast
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Devonian black shales of the Marcellus Formation with potential for V. Results from early exploration programs indicate that V grades for deposits within mafic and ultramafic complexes in this region.
Identified resources Unknown.
Production Unknown.
Status Unknown.
Estimated resources Unknown.
Geologic maps Horton and others (2017), scale 1:500,000; Miles (2003), scale 1:500,000; Rickard and others (1970), scale 1:250,000; Slucher and others (2006), scale 1:500,000; Cardwell and others (1968), scale 1:250,000.
Geophysical data Inadequate Rank 4 aeromagnetic and Rank 5 aeroradiometric coverage.
Favorable rocks and structures Devonian-age black shales.
Deposits None.
Evidence from mineral occurrences Unknown.
Geochemical evidence Preliminary soil and sediment maps of the United States (Smith and others, 2015) show arcuate highs for a range of elements, including Co, Mo, Ni, and V in Devonian black shales.
Geophysical evidence Inadequate aeromagnetic/radiometric data: aeromagnetic data rank 4; radiometric rank 5.
Evidence from other sources Unknown.
Comments Because many V-rich carbonaceous shales also contain high U concentrations, downhole geophysical techniques (gamma logs) may be useful in identifying the position of metalliferous shales.
Cover thickness and description Outcrop and subcrop is the area of interest.
Authors Nora K. Foley, Clinton Scott, Dane S. VanDervoort, John P. Whitmore.
New data needs Geophysical data and geochemical analyses.
Geologic mapping and modeling needs Geologic mapping.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage. Aeromagnetic and aeroradiometric data can assist with framework geology such as structural features and contacts.
Digital elevation data needs Lidar variable across this large focus area -- either complete or in progress.