Preliminary assessment of clinoptilolite K/Ar results from Yucca Mountain, Nevada: A potential high-level radioactive waste repository site

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At Yucca Mountain, evidence for at least three distinct temporal groups of clinoptilolites can be delineated from the preliminary K/Ar dates (2--3 Ma; 4--5 Ma; 7--11 Ma). The older K/Ar dates that are similar to published illite/smectite ages (9--12 Ma) may be crystallization ages, whereas the younger dates probably represent continued diagenetic reactions of older clinoptilolites with percolating fluids. The K/Ar dates increase with depth, suggesting minimal argon loss in the deeper samples. Internal consistency of the clinoptilolite K/Ar results at different levels within the drill holes suggest that dating of K-rich zeolites may provide useful information for assessing the ... continued below

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5 p.

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WoldeGabriel, G.; Bish, D.L.; Broxton, D.E. & Chipera, S.J. March 1, 1992.

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At Yucca Mountain, evidence for at least three distinct temporal groups of clinoptilolites can be delineated from the preliminary K/Ar dates (2--3 Ma; 4--5 Ma; 7--11 Ma). The older K/Ar dates that are similar to published illite/smectite ages (9--12 Ma) may be crystallization ages, whereas the younger dates probably represent continued diagenetic reactions of older clinoptilolites with percolating fluids. The K/Ar dates increase with depth, suggesting minimal argon loss in the deeper samples. Internal consistency of the clinoptilolite K/Ar results at different levels within the drill holes suggest that dating of K-rich zeolites may provide useful information for assessing the zeolitization at Yucca Mountain. Variations in the K/Ar dates are probably related to Ar loss during dissolution of older clinoptilolites and to contamination by finely crystalline feldspars.

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5 p.

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INIS; OSTI as DE92008473

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  • 7. water-rock interaction conference, Park City, UT (United States), 9-23 Jul 1992

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  • Other: DE92008473
  • Report No.: LA-UR--92-461
  • Report No.: CONF-920761--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 138403
  • Archival Resource Key: ark:/67531/metadc623848

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  • March 1, 1992

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 26, 2016, 3:27 p.m.

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WoldeGabriel, G.; Bish, D.L.; Broxton, D.E. & Chipera, S.J. Preliminary assessment of clinoptilolite K/Ar results from Yucca Mountain, Nevada: A potential high-level radioactive waste repository site, article, March 1, 1992; New Mexico. (digital.library.unt.edu/ark:/67531/metadc623848/: accessed January 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.