Hydrogeochemical and stream sediment reconnaissance basic data for St. Cloud NTMS Quadrangle, Minnesota

Field and laboratory data are presented for 676 groundwater and 659 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. Results from the groundwater samples have not delineated any areas of apparent uranium mineralization in the St. Cloud Quadrangle. High uranium values in groundwaters occur in glacial deposits of the Des Moines Lobe west of the Alexandria Moraine and appear to reflect the composition of Cretaceous units west of the quadrangle, which served as the source for much of the glacial material. Stream sediment data indicate that relatively high uranium values are associated with the Des Moines Lobe deposits in the western portion of the quadrangle. Uranium in the eastern portion of the quadrangle appears to be associated with heavy or resistate minerals, which are contained in the Wadena Lobe glacial deposits