Uranium hydrogeochemical and stream sediment reconnaissance of the Montrose NTMS quadrangle, Colorado, including concentrations of forty-three additional elements. Informal report. [NONE]

Technical Report · Sun Jul 01 04:00:00 EDT 1979

OSTI ID:5860728

Broxton, D E; Morris, W A; Bolivar, S L

1365 water samples were collected from streams, springs, and wells and were analyzed for uranium and 12 other elements. 1857 sediment samples, taken from streams and springs, were analyzed for uranium, thorium, and 41 other elements. Uranium concentrations of water samples range from below the detection limit of 0.02 ppB to 209.50 ppB. Twelve areas are delineated by water samples with anomalous uranium concentrations; nine of these are associated with known uranium occurrences. In the crystalline terrane on the eastern side of the quadrangle, water samples with anomalous uranium concentrations are predominantly associated with Precambrian X granitic and metamorphic rocks, Precambrian Y alkalic plutons, Paleozoic-Mesozoic sedimentary formations, and Tertiary volcanic and sedimentary rocks. Water samples with anomalous uranium concentrations also occur in areas underlain by mid-Tertiary volcanic rocks of the San Juan volcanic field in the southeast part of the quadrangle and by the Mancos and Mesaverde formations in the western part of the quadrangle. Uranium concentrations of sediment samples range from 0.94 to 136.80 ppM. Seven areas are delineated by sediment samples with anomalous uranium concentrations; six of these are associated with known uranium occurrences. The anomalous clusters are associated with areas underlain by felsic plutonic rocks of the mid-Tertiary Mt. Princeton batholith, Precambrian X granitic and metamorphic rocks in fault or unconformable contact with Paleozoic formations, undivided Precambrian X and Y granites faulted against Paleozoic and Mesozoic sedimentary rocks, and felsic plutonic rocks of the Laramide Twin Lakes stock. Most of the sediment samples with anomalous uranium concentrations also have elevated thorium concentrations and high uranium/thorium ratios.

• Research Organization: Los Alamos Scientific Lab., NM (USA)
• DOE Contract Number: EY-76-C-13-1664
• OSTI ID: 5860728
• Report Number(s): GJBX-125(79); LA-7507-MS
• Country of Publication: United States
• Language: English

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