Multiple episodes of zeolite deposition in fractured silicic tuff

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Description

Fractures in silicic tuffs above the water table at Yucca Mountain, Nevada, USA contain two morphologies of heulandite with different compositions. Tabular heulandite is zoned, with Sr-rich cores and Mg-rich rims. Later prismatic heulandite is nearly the same composition as the more magnesian rims. Heulandite and stellerite may occur between layers of calcite, and calcite occurs locally between generations of heulandite. Thermodynamic modeling, using estimated thermodynamic data and observed chemical compositions for heulandite and stellerite, shows that stellerite is the favored zeolite unless Ca concentrations are reduced or Mg and/or Sr concentrations are significantly elevated above current Yucca Mountain waters.

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9 p.

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Carlos, B.A.; Chipera, S.J. & Snow, M.G. April 1, 1995.

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Description

Fractures in silicic tuffs above the water table at Yucca Mountain, Nevada, USA contain two morphologies of heulandite with different compositions. Tabular heulandite is zoned, with Sr-rich cores and Mg-rich rims. Later prismatic heulandite is nearly the same composition as the more magnesian rims. Heulandite and stellerite may occur between layers of calcite, and calcite occurs locally between generations of heulandite. Thermodynamic modeling, using estimated thermodynamic data and observed chemical compositions for heulandite and stellerite, shows that stellerite is the favored zeolite unless Ca concentrations are reduced or Mg and/or Sr concentrations are significantly elevated above current Yucca Mountain waters.

Physical Description

9 p.

Notes

INIS; OSTI as DE95009430

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  • International symposium on water-rock interaction, Vladivostok (Russian Federation), 13-28 Aug 1995

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  • Other: DE95009430
  • Report No.: LA-UR--95-871
  • Report No.: CONF-950888--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 62620
  • Archival Resource Key: ark:/67531/metadc697700

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  • April 1, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 25, 2016, 9:27 p.m.

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Carlos, B.A.; Chipera, S.J. & Snow, M.G. Multiple episodes of zeolite deposition in fractured silicic tuff, article, April 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc697700/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.