| Basis for focus area |
Alkaline igneous rocks with REE potential intruding Cretaceous carbonate platform with small surface expression, but little known about alteration and subsurface mineral potential. |
| Identified resources |
Unknown. |
| Production |
Unknown. |
| Status |
Unknown. |
| Estimated resources |
Unknown. |
| Geologic maps |
Brown and others (1983), scale 1:250,000; Waechter and others (1977), scale 1:250,000; Collins (1998), scale 1:24,000. |
| Geophysical data |
Partly adequate (25%) aeromagnetic coverage (Smith and others, 2002); inadequate aeroradiometric coverage. |
| Favorable rocks and structures |
Balcones Igneous Province; Cretaceous sub-silicic, alkalic sills, laccoliths, plugs, and small dikes intruding sedimentary rocks of the Texas coastal plain. |
| Deposits |
None. |
| Evidence from mineral occurrences |
Unknown. |
| Geochemical evidence |
No data. |
| Geophysical evidence |
No data. |
| Evidence from other sources |
No data. |
| Comments |
Arcuate trend of Balcones Igneous Province may coincide with the buried Ouachita structural trend (Spencer, 1969). |
| Cover thickness and description |
Deposits may be present at depth in mapped sedimentary rocks or concealed by post-Cretaceous rock units. |
| Authors |
Brent A. Elliott, Joshua M. Rosera. |
| New data needs |
Need surveys to locate prospective areas, followed my detailed mapping and chemistry of prospects. |
| Geologic mapping and modeling needs |
Collins (1998) 1:24,000 scale map is the only available map. |
| Geophysical survey and modeling needs |
High resolution, Rank 1 aeromagnetics and aeroradiometric coverage would be useful for tracing subsurface geology and structures. |
| Digital elevation data needs |
Lidar complete. |
