The chemical durability of tektites—A laboratory study and correlation with long-term corrosion behavior

Barkatt, Aaron; Boulos, M. S.; Sousanpour, William; Boroomand, Morad A.; Macedo, P. B.; O’Keefe, John A.

doi:10.1016/0016-7037(84)90256-4

Cited by 37 publications

(9 citation statements)

References 41 publications

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“…The tektite reaction mechanism in hydrothermal solution is thought to be dominated by etching [12,13]. Given the similarities in composition to obsidian, we decided to examine tektite reaction under vapor hydration conditions and see if it is dominated by molecular water diffusion.…”

Section: Resultsmentioning

confidence: 99%

Obsidians and Tektites: Natural Analogues for Water Diffusion in Nuclear Waste Glasses

Mazer

Bates

Stevenson³

et al. 1991

MRS Proc.

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Molecular water diffusion in natural obsidians and tektite was investigated in vapor hydration tests performed between 75 and 230°C for up to 400 days. Reaction progress was monitored using measurements of the birefringent hydration layer, an alteration feature associated with strain caused by molecular water diffusion in obsidians. The hydration rate constants and temperature dependence of the reaction are strongly correlated with the logarithm of the initial total water content of the glass. These values have been quantified for conditions relevant to the potential Yucca Mountain repository. The low initial total water concentrations of Savannah River Lab nuclear waste glasses produced at the bench-top scale help to minimze the effects of molecular water diffusion in waste glasses. The results of this study indicate that molecular water diffusion does not dominate waste glass reactions under conditions considered in this study. However, it is unknown whether molecular water diffusion will be important under other reaction conditions, especially longer time periods.

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Section: Resultsmentioning

confidence: 99%

Obsidians and Tektites: Natural Analogues for Water Diffusion in Nuclear Waste Glasses

Mazer

Bates

Stevenson³

et al. 1991

MRS Proc.

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“…For quite some time, researchers believed that tektite glass does not form alteration products but is simply dissolved (e.g., Glass, 1974Glass, , 1984Glass, , 1986LaMarche et al, 1984;Barkatt et al, 1984Barkatt et al, , 1986Barkatt et al, , 1989) with the dissolution rate being determined by the chemical composition of the glass (e.g., El-Shamy, 1973;Barkatt et al, 1984). The recent discovery of partly altered impact glasses at the K-T boundary, however, demonstrated that, under some diagenetic conditions, glasses with specific chemical compositions can undergo alteration (e.g., palagonitization; cf., Glass and Bohor, 1995).…”

Section: Discussionmentioning

confidence: 99%

Water in tektites and impact glasses by fourier‐transformed infrared spectrometry

Beran

Koeberl

1997

Meteorit & Planetary Scien

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“…13.0 (Crovisier et al, 1985), line 2 = tektites (Barkatt et al, 1984), line 3 = basaltic glass (Gislason and Eugster, 1987), line 4 = quartz (Rimstidt and Barnes, 1980). Data points (shown by X) = rhyolitic glasses (White and Claassen, 1980 Steen-Mclntyre (1975) advocated the use of the hydration rate of pumice as a means of dating ash beds.…”

Section: Bmentioning

confidence: 99%

Thermodynamic Aspects of Leg 126 Interstitial Waters

Egeberg¹

1992

Proceedings of the Ocean Drilling Program

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The Ocean Drilling Program Leg 126 sites may be classified into two categories depending on the presence (Group I: Sites 787, 792, and 793) or absence (Group II: Sites 788, 790, and 791) of steep concentration gradients. Shipboard X-ray diffraction analyses of bulk sediments from Group I sites revealed the presence of a number of diagenetic minerals (some of which are incompatible), but no systematic diagenetic zonation. The results of the chemical analyses of the pore waters from Group I have been used to estimate the activities of dissolved species. Thermodynamic analyses of the composition of the pore waters and the stability of authigenic minerals (gypsum, zeolites, feldspars, smectites, chlorites, and micas) show that the pore waters are close to equilibrium with most of the observed phases. Thus, only a small perturbation of the system (substitution in minerals and fluctuations in pore-water composition, in particular, in pH and SiO 2 activity) will cause any of these phases to precipitate. Therefore, one would not expect mineralogical observations to show systematic vertical zonations at these sites. It is suggested that chlorites and high-temperature zeolites are not diagenetic sensu stricto, but were eroded from volcaniclastic highs. The absence of concentration gradients at the Group II sites has been analyzed in terms of reaction kinetics, hydrothermal advection, and temperature distribution. The absence of diagenetic imprints on the pore-water concentration profiles at these sites is probably caused by the slow nucleation of silica phases.

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The chemical durability of tektites—A laboratory study and correlation with long-term corrosion behavior

Cited by 37 publications

References 41 publications

Obsidians and Tektites: Natural Analogues for Water Diffusion in Nuclear Waste Glasses

Obsidians and Tektites: Natural Analogues for Water Diffusion in Nuclear Waste Glasses

Water in tektites and impact glasses by fourier‐transformed infrared spectrometry

Thermodynamic Aspects of Leg 126 Interstitial Waters

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