Texas Cretaceous intrusions

Region West, Southwest
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

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.