Hydrogeochemical and stream sediment detailed geochemical survey for Trans-Pecos, Texas

Technical Report · Fri Oct 31 04:00:00 EST 1980

OSTI ID:6580040

Butz, T R; Wagner, M E; Grimes, J G; Bard, C S; Helgerson, R N; Pritz, P M

Results of the Stillwell Mountains project area of the detailed geochemical survey for Trans-Pecos, Texas are reported. Field and laboratory data are presented for 10 groundwater and 228 stream sediment samples. Statistical and areal distributions of uranium and possible uranium-related variables are given. A generalized geologic map of the project area is provided, and pertinent geologic factors which may be of significance in evaluating the potential for uranium mineralization are briefly discussed. Two groundwater samples from the western section of the project area have the highest uranium values (17.35 and 6.80 ppB). These samples display relatively high concentrations of variables commonly found associated with sulfide mineralization (silver, copper, molybdenum, and selenium). The specific conductance values measured for these two samples represent the second highest and the third lowest values in the project area. The producing horizons of these two samples are inferred to be in or below the Buda Limestone. The two samples occur in a rifted area with stratigraphically Lower Santa Elena Limestone and Tertiary intrusives exposed along the uplifted blocks. Stream sediment samples containing significant amounts of soluble uranium (greater than or equal to 1.90 ppM) represent two major areas: along the Rio Grande (trending NE-SW) from Sierra Larga to Big Canyon, and between the Sierra del Carmen Range and Stillwell Mountain (trending NW-SE). Arsenic, beryllium, lithium, molybdenum, selenium, and vanadium are associated with high uranium values in both of the areas. The areas with high uranium values are characterized by extensive Tertiary faulting and folding and Tertiary intrusives.

• Research Organization: Oak Ridge Gaseous Diffusion Plant, TN (USA)
• DOE Contract Number: AC13-76GJ01664
• OSTI ID: 6580040
• Report Number(s): GJBX-29-80(Pt.6); K/UR-29(Pt.6)
• Country of Publication: United States
• Language: English

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