Preliminary gravity inversion model of basins east of Yucca Flat, Nevada Test Site, Nevada.

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The Yucca Flat eastern extension study area, a 14 kilometer by 45 kilometer region contiguous to Yucca Flat on the west and Frenchman Flat on the south, is being studied to expand the boundary of the Yucca Flat hydrogeologic model. The isostatic residual gravity anomaly was inverted to create a model of the depth of the geologic basins within the study area. Such basins typically are floored by dense pre-Tertiary basement rocks and filled with less-dense Tertiary volcanic and sedimentary rocks and Quaternary alluvium, a necessary condition for the use of gravity modeling to predict the depth to the pre-Tertiary ... continued below

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Phelps, Geoffrey A. & Carter W. Roberts, and Barry C. Moring March 17, 2006.

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The Yucca Flat eastern extension study area, a 14 kilometer by 45 kilometer region contiguous to Yucca Flat on the west and Frenchman Flat on the south, is being studied to expand the boundary of the Yucca Flat hydrogeologic model. The isostatic residual gravity anomaly was inverted to create a model of the depth of the geologic basins within the study area. Such basins typically are floored by dense pre-Tertiary basement rocks and filled with less-dense Tertiary volcanic and sedimentary rocks and Quaternary alluvium, a necessary condition for the use of gravity modeling to predict the depth to the pre-Tertiary basement rocks within the basins. Three models were created: a preferred model to represent the best estimate of depth to pre-Tertiary basement rocks in the study area, and two end-member models to demonstrate the possible range of solutions. The preferred model predicts shallow basins, generally less than 1,000m depth, throughout the study area, with only Emigrant Valley reaching a depth of 1,100m. Plutonium valley and West Fork Scarp Canyon have maximum depths of 800m and 1,000m, respectively. The end-member models indicate that the uncertainty in the preferred model is less than 200m for most of the study area.

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  • Report No.: USGS OFR 2005-1313
  • Grant Number: AI52-01NV13944
  • DOI: 10.2172/878101 | External Link
  • Office of Scientific & Technical Information Report Number: 878101
  • Archival Resource Key: ark:/67531/metadc875101

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  • March 17, 2006

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 31, 2016, 8:29 p.m.

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Phelps, Geoffrey A. & Carter W. Roberts, and Barry C. Moring. Preliminary gravity inversion model of basins east of Yucca Flat, Nevada Test Site, Nevada., report, March 17, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc875101/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.