| Basis for focus area |
Magnetic anomaly high similar in amplitude and size to the magnetic anomaly over Magnet Cove. Deposit type is unknown but shares geophysical similarity to the Magnet Cove carbonatite/peralkaline complex. |
| Identified resources |
None. |
| Production |
None. |
| Status |
Unknown. |
| Estimated resources |
Unknown. |
| Geologic maps |
Haley and others (1993), scale 1:500,000. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Serpentinized peridotite was encountered at a depth of 1,085 m within this focus area. |
| Deposits |
None. |
| Evidence from mineral occurrences |
None. |
| Geochemical evidence |
Arkansas Geological Survey drill hole noted the presence of 10 foot section of calcite with highly altered ferro-magnesian minerals and abundant magnetite, ilmenite, and other Ti-rich minerals, indicating chemical similarity to carbonatites found in Magnet Cove. |
| Geophysical evidence |
Gravity and magnetic anomalies associated with the Rison peridotite have approximately the same amplitude as that at Magnet Cove. |
| Evidence from other sources |
Hendricks (1988) reports of the anomaly and the mineralogy of the peridotite encountered in the deep drill hole. |
| Cover thickness and description |
Arkansas Geological Survey maintains core from the Arkansas Natural Gas Corp Tate No. 1 well, located 5 km west of Rison, AR. Igneous rock was encountered at 1,085 m. |
| Authors |
Corbin Cannon, Anne E. McCafferty. |
| New data needs |
New aeromagnetic and aeroradiometric survey with additional ground gravity, new geologic mapping. |
| Geologic mapping and modeling needs |
No recent geologic maps at 1:24,000 scale; new geologic mapping needed. |
| Geophysical survey and modeling needs |
High resolution geophysical aeromagnetic and aeroradiometric coverage. |
| Digital elevation data needs |
Lidar adequate. |
