Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada

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Quantitative X-ray powder diffraction methods have been used to analyze 108 samples from drill core UE-25 UZ{number_sign}16 at Yucca Mountain, Nevada. This drill hole, located within the imbricate fault zone east of the potential Yucca Mountain repository site, confirms the authors` previous knowledge of gross-scale mineral distributions at Yucca Mountain and provides insight into possible shallow pathways for hydrologic recharge into the potential host rock. Analyses of samples from UE-25 UZ{number_sign}16 have shown that the distribution of major zeolitized horizons, of silica phases, and of glassy tuffs are similar to those noted in nearby drill cores. However, the continuous core ... continued below

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39 p.

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Chipera, S.J.; Vaniman, D.T.; Carlos, B.A. & Bish, D.L. February 1, 1995.

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Description

Quantitative X-ray powder diffraction methods have been used to analyze 108 samples from drill core UE-25 UZ{number_sign}16 at Yucca Mountain, Nevada. This drill hole, located within the imbricate fault zone east of the potential Yucca Mountain repository site, confirms the authors` previous knowledge of gross-scale mineral distributions at Yucca Mountain and provides insight into possible shallow pathways for hydrologic recharge into the potential host rock. Analyses of samples from UE-25 UZ{number_sign}16 have shown that the distribution of major zeolitized horizons, of silica phases, and of glassy tuffs are similar to those noted in nearby drill cores. However, the continuous core and closer sample spacing in UE-25 UZ{number_sign}16 provide a more exact determination of mineral stratigraphy, particularly in hydrologically important units such as the Paintbrush bedded tuffs above the Topopah Spring Tuff and in the upper vitrophyre of the Topopah Spring Tuff. The discovery of matrix zeolitization in the devitrified Topopah Spring Tuff of UE25 UZ{number_sign}16 shows that some unexpected mineralogic features can still be encountered in the exploration of Yucca Mountain and emphasizes the importance of obtaining a more complete three-dimensional model of Yucca Mountain mineralogy.

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39 p.

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INIS; OSTI as DE95008371

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  • Other Information: PBD: Feb 1995

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  • Other: DE95008371
  • Report No.: LA--12810-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/28334 | External Link
  • Office of Scientific & Technical Information Report Number: 28334
  • Archival Resource Key: ark:/67531/metadc669725

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  • February 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 25, 2016, 8:59 p.m.

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Chipera, S.J.; Vaniman, D.T.; Carlos, B.A. & Bish, D.L. Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada, report, February 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc669725/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.