| Basis for focus area |
Peralkaline 1.7 Ga A-type granite intrusion in the Upper Peninsula of Michigan containing elevated REE, anomalous Ba, F, Sn, W, and U. |
| Identified resources |
None known. |
| Production |
No known production. |
| Status |
Unknown. |
| Estimated resources |
No data. |
| Geologic maps |
Cannon (1975), scale 1:24,000. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Peralkaline granite intrusion located along trend of concealed Great Lakes tectonic zone. |
| Deposits |
No data. |
| Evidence from mineral occurrences |
No data. |
| Geochemical evidence |
Geochemical similarities to other rare metal enriched granites. |
| Geophysical evidence |
No data. |
| Evidence from other sources |
No data. |
| Comments |
No reported mineralization, but rock type is permissive for possible critical mineral deposits. |
| Cover thickness and description |
Exposed. |
| Authors |
Benjamin J. Drenth, Klaus Schulz. |
| New data needs |
New mapping, high resolution geophysics. |
| Geologic mapping and modeling needs |
Need new geologic mapping. |
| Geophysical survey and modeling needs |
Need aeromagnetic, radiometric, and gravity data collection. |
| Digital elevation data needs |
Lidar adequate. |
