Fluvial Architecture of Jurassic Uranium-Bearing Sandstones, Colorado Plateau, Western United States

  1. J. D. Collinson and
  2. J. Lewin
  1. Noel Tyler and
  2. Frank G. Ethridge

Published Online: 29 APR 2009

DOI: 10.1002/9781444303773.ch42

Modern and Ancient Fluvial Systems

Modern and Ancient Fluvial Systems

How to Cite

Tyler, N. and Ethridge, F. G. (1983) Fluvial Architecture of Jurassic Uranium-Bearing Sandstones, Colorado Plateau, Western United States, in Modern and Ancient Fluvial Systems (eds J. D. Collinson and J. Lewin), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303773.ch42

Author Information

  1. Department of Earth Resources, Colorado State University, Fort Collins, Colorado 80523, USA

  1. Bureau of Economic Geology, The University of Texas at Austin, Austin, Texas 78712, USA

Publication History

  1. Published Online: 29 APR 2009
  2. Published Print: 7 FEB 1983

ISBN Information

Print ISBN: 9780632009978

Online ISBN: 9781444303773

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Keywords:

  • fluvial architecture of Jurassic uranium-bearing sandstones – Colorado Plateau, western United States;
  • Slick Rock uranium district;
  • epigenetic uranium;
  • fluvial architecture;
  • large-scale cross-bedded facies

Summary

Vanadium- and uranium-bearing sandstones of the Salt Wash Member of the Morrison Formation in south-western Colorado were deposited in a fluvial system that contained a range of channel types. Broad and deep low-sinuosity streams, which were the principal drainage elements, deposited dip-elongate sandstone units. Amalgamation of individual sand bodies resulted in multilateral sandbelt geometry of the lower and upper intervals of the Salt Wash. Minor components of the fluvial system were meandering tributaries of the low-sinuosity streams and crevasse channel and associated splays formed during flooding of the trunk and tributary system.

The Slick Rock uranium district is located in the zone of convergence of smaller streams into trunk rivers. The trunk streams are characterized by individual depositional units stacked into two zones of higher sandstone content. The northernmost of these axes strongly influenced the pattern of migration and concentration of uranium. Significant ore deposits in the district are developed within and along the margins of the axis, which is principally composed of low-sinuosity stream deposits. Excellent downdip interconnectedness of these sandstones made them the major conduits of uraniferous ground-water flow. Smaller deposits are contained within meandering stream sediments. Crevasse splay sequences are essentially barren. Vertical interconnectedness between multi-storied depositional units results in local stacking of mineral deposits.