Hydrogeochemical and stream sediment reconnaissance basic data for Sherman NTMS Quadrangle, Texas; Oklahoma. Uranium resource evaluation report

Abstract

Field and laboratory data are presented for 718 groundwater and 715 stream sediment samples. Statistical and areal distributions of uranium and possible uranium-related variables are displayed. A generalized geologic map of the survey area is provided, and pertinent geologic factors which may be of significance in evaluating the potential for uranium mineralization are briefly discussed. Groundwater data indicate that uranium concentrations above the 85th percentile are predominant in the Trinity Group (Lower Cretaceous), and the Taylor and Navarro Groups (Upper Cretaceous). Values of uranium above the 85th percentile also occur in the Permian units located in the northwestern section of the survey area. Several trends delineating saline water are discernable, the most notable of which occur in sections of the Woodbine Formation and the Permian units. Less distinguishing saline trends occur in many of the Upper Cretaceous formations. Stream sediment data indicate that uranium concentrations above the 85th percentile occur in sections of the Fredericksburg Group parallel to the contact with the Washita Group, in the Eagle Ford Formation, and in the Taylor Group. High values of uranium in the Fredericksburg Group appear to be associated with carbonates and marine clays. High values of uranium in the Eagle Ford Formation are most likely associated with heavy and/or resistate mineral assemblages. High values of uranium occurring in the Taylor Group may be related to the carbonate and phosphatic lithologies which comprise this group.