Distribution of uranium, thorium and potassium in Proterozoic igneous rocks, Franklin Mountains, West Texas (A Synopsis)

CIM Bulletin, Vol. 76, No. 850, 1983

WILLIAM F. THOMANN, Department of Geosciences, Texas A&l University, Kingsville, Texas, ARTHUR J. PYRON, Armstrong Energy Corporation, Roswell, New Mexico, DAVID R. RAY, Texaco Inc. Coral Gables, Florida

Proterozoic plutonic and volcanic rocks in the Franklin Mountains, west Texas, exhibit similar values in average concentrations of equivalent uranium (ell), equivalent thorium (eTh) and equivalent potassium (eK) when compared to Proterozoic igneous rocks of the southwestern United States. Variations of radioelement concentrations for all Proterozoic igneous rocks of the Franklin Mountains range from 1.1 to 357.1 ppm U, 2.1 to 259.1 ppm Th and 2.5 to 10.2% K. Recent geologic mapping of the Proterozoic rocks in the Franklin Mountains revealed several types of granites previously unrecognized, and these warrant further exploration for U and Th resources. Fluorite-bearing granites and riebeckite pegmatites are likely targets for further investigation, as these have the highest U and Th concentrations compared to all other granites.
Keywords: Uranium, Thorium, Potassium, Franklin Mountains, Texas, Variation diagrams, Proterozoic rocks, Radioelements, Tin deposits.