A natural analogue for high-level waste in tuff: Chemical analysis and modeling of the Valles site

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The contact between an obsidian flow and a steep-walled tuff canyon was examined as an analogue for a high-level waste repository. The analogue site is located in the Valles Caldera in New Mexico, where a massive obsidian flow filled a paleocanyon in the Battleship Rock Tuff. The obsidian flow provided a heat source, analogous to waste panels or an igneous intrusion in a repository, and caused evaporation and migration of water. The tuff and obsidian samples were analyzed for major and trace elements and mineralogy by INAA, XRF, x-ray diffraction, and scanning electron microscopy and electron microprobe. Samples were also ... continued below

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9 p.

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Stockman, H.W.; Krumhansl, J.L.; Ho, C.K.; Kovach, L. & McConnell, V.S. March 1, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The contact between an obsidian flow and a steep-walled tuff canyon was examined as an analogue for a high-level waste repository. The analogue site is located in the Valles Caldera in New Mexico, where a massive obsidian flow filled a paleocanyon in the Battleship Rock Tuff. The obsidian flow provided a heat source, analogous to waste panels or an igneous intrusion in a repository, and caused evaporation and migration of water. The tuff and obsidian samples were analyzed for major and trace elements and mineralogy by INAA, XRF, x-ray diffraction, and scanning electron microscopy and electron microprobe. Samples were also analyzed for D/H and {sup 39}Ar/{sup 40}Ar isotopic composition. Overall, the effects of the heating event seem to have been slight and limited to the tuff nearest the contact. There is some evidence of devitrification and migration of volatiles in the tuff within 10 m of the contact, but variations in major and trace element chemistry are small and difficult to distinguish from the natural (pre-heating) variability of the rocks.

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9 p.

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INIS; OSTI as DE95008533

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  • Waste management `95, Tucson, AZ (United States), 26 Feb - 2 Mar 1995

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  • Other: DE95008533
  • Report No.: SAND--95-0271C
  • Report No.: CONF-950216--76
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 37753
  • Archival Resource Key: ark:/67531/metadc688708

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 1995

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  • July 25, 2015, 2:20 a.m.

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  • April 13, 2016, 4 p.m.

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Stockman, H.W.; Krumhansl, J.L.; Ho, C.K.; Kovach, L. & McConnell, V.S. A natural analogue for high-level waste in tuff: Chemical analysis and modeling of the Valles site, article, March 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc688708/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.