Kansas Lamproite

Region Central, South Central
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Two structural domes in Woodson and Wilson Counties, Kansas, with ultrapotassic lamproite.
Identified resources Historical production of magnesium-mica for animal-feed applications.
Production Unknown.
Status Past mining.
Estimated resources No data.
Geologic maps Merriam (1999), scale 1:50,000; Wagner (2000), scale 1:50,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Ultrapotassic lamproite (Mg and up to 22% K2O).
Deposits Rose Dome, Silver City Dome.
Evidence from mineral occurrences Cullers and Berendsen (2011).
Geochemical evidence Lamproites contain serpentinized olivine and mica with less amounts of K-richterite, diopside, rutile, apatite, perovskite, and spinel in a Serpentinized groundmass. Lamproites are ultrapotassic (K2O/Na2O = 2.0 to 22.1%), alkalic, and enriched LREE, Ta, Hf, Ba, Rb, Sr, and Th (Cullers and Berendsen, 2011). Major and trace element concentrations from 123 lamproites and associated sedimentary rocks samples from 6 cores from the Silver City Dome and 2 cores from the Rose Dome were analyzed (Cullers and Berendsen, 2011).
Geophysical evidence Ground geophysics detected the diatreme at Rose Dome as a magnetic high and several of the near surface sills as conductivity highs.
Evidence from other sources No data.
Comments Numerous drill cores at Kansas Geological Survey. Lamproite at the Silver City Dome was mined in a small open-pit operation for use as an industrial mineral in animal-feed applications.
Cover thickness and description Deposit are a series of sills intermingled with Paleozoic sedimentary rocks. Uppermost sills are exposed at surface and currently being mined.
Authors Franek Hasiuk.
New data needs High resolution geophysics, additional coring.
Geologic mapping and modeling needs None.
Geophysical survey and modeling needs Rank 1 aeromagnetic and radiometric data.
Digital elevation data needs Lidar adequate.