| 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. |
