Chemical diffusion of fluorine in melts in the system Na2OAl2O3SiO2

Dingwell, Donald B.; Scarfe, Christopher M.

doi:10.1016/0012-821x(85)90085-8

Cited by 29 publications

(16 citation statements)

References 23 publications

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“…4). However, Dingwell and Scarfe (1985) observed a 6-fold increase in F diffusivity between 1 atm and 1.0 GPa in jadeitic melt, whereas our measurements on a basaltic melt yield a decrease of only 1.1, which is within our inter-experimental variability. The differing influence of pressure on F diffusion in jadeitic melt and in basaltic melt is possibly due to the difference in experimental techniques used in this study and in Scarfe (1984, 1985), where their 1 atm experiments involved the loss of F, Si, Al and Na from the melt by vaporization, potentially creating a much greater chemical potential gradient than in our study.…”

Section: Halogen Diffusion In Different Melt Compositionssupporting

confidence: 65%

“…Nevertheless, comparison between our results and those of Dingwell and Scarfe suggests that any pressure affect on F diffusion in basaltic melts between 1 atm and 0.5 GPa will be small. Dingwell and Scarfe's (1985) measurements of F diffusion in albite melt at 1 atm indicate that its diffusivity is about two orders of magnitude lower than in jadeite and in basalt (Fig. 4) at 1.0 GPa, and there is about 1 order of magnitude difference between F diffusion in jadeitic and albitic melts at 1 atm.…”

Section: Halogen Diffusion In Different Melt Compositionsmentioning

confidence: 83%

“…4) at 1.0 GPa, and there is about 1 order of magnitude difference between F diffusion in jadeitic and albitic melts at 1 atm. These differences are most probably due to the differing compositions as discussed by Dingwell and Scarfe (1985).…”

Section: Halogen Diffusion In Different Melt Compositionsmentioning

confidence: 90%

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Halogen diffusion in a basaltic melt

Alletti

Baker

Freda

2007

Geochimica et Cosmochimica Acta

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Section: Halogen Diffusion In Different Melt Compositionssupporting

confidence: 65%

Section: Halogen Diffusion In Different Melt Compositionsmentioning

confidence: 83%

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Halogen diffusion in a basaltic melt

Alletti

Baker

Freda

2007

Geochimica et Cosmochimica Acta

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“…The second contribution of the above authors to the data base on chemical diffusion of fluorine (Dingwell and Scarfe, 1985) involved I-atmosphere devolatilization experiments. Fluorine-enriched spheres of albite, jadeite, and peraluminous glass (75 wt% Si0 2 ) were suspended from Pt loops in an oxygen-flow furnace, such that at high temperature (1200 to 1400°C) the fluorine in the spheres exchanged with ambient oxygen.…”

Section: Crystal Dissolutionmentioning

confidence: 99%

Chemical Diffusion in Magmas: An Overview of Experimental Results and Geochemical Applications

Watson¹,

Baker²

1991

Advances in Physical Geochemistry

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The subject of chemical diffusion in magmas has attracted the interest of petrologists and geochemists seeking to place time constraints on phenomena ranging from magma mixing to crystal growth. Experiments have been devised to examine chemical diffusion effects during such processes as interdiffusion of two liquids, growth and dissolution of crystals, exchange of halogens with oxygen in the air, reduction or oxidation of dissolved iron oxide, and introduction of dissolved volatiles. A few experiments have even been done using a temperature gradient to induce thermal migration.Many of the studies carried out to date have incorporated variations in temperature, pressure, and dissolved H 2 0 content, so the collective results allow diffusivities in magmas to be estimated quite well for most geologicallyrealizable conditions. In general, the following major characteristics appear to hold:(1) Network-forming species, most notably Si0 2 , are the slowest-moving magmatic components, although network-modifiers that form stable complexes in the melt may be equally sluggish; (2) alkalies, divalent cations, oxygen, and fluorine are the most mobile magmatic components when their transport is not rate-limited by counterdiffusion of slower species; and (3) the effect of H 2 0 content on chemical diffusion of most components (including H 2 0 itself) is extremely large, sometimes amounting to several orders of magnitude at crustal melting conditions.

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“…Hermann et al (1987) suggest diffusion coefficients for C1 will be several orders of magnitude larger than those for F; however, their C1 data are suspect due to the high measured C1 solubility, the peculiar pressure dependence, and the use of Cl, gas. Dingwell and Scarfe (1985) measured F diffusion in three anhydrous Na,O-Al,O,-SiO, melts; a tenuous extrapolation of data for their "albite" composition to 400°C yields D = l@13 cm2/sec, but there was a strong dependence on glass composition in this limited set of experiments, suggesting the need to obtain data for compositions that more closely match the BRT glasses. Jambon (1982) measured diffusion coefficients for a variety of cations in obsidian glasses and melts, and concluded that the activation energies were largely dependent on the squared formal charge and the ionic radius.…”

Section: Gas Transport Experimentsmentioning

confidence: 91%

The Valles natural analogue project

Stockman¹,

Krumhansl²,

et al. 1994

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The folloivlng documents in the NUREG serles are avallable for purchase from the Government Printing Offlce:formal NRC staff and contractor reports, NRC-sponsored conference proceedings, International agreement reports, grantee reports, and NRC booklets and brochures. Also avallable are regulatory guldes, NRC regulatlons In the Code of Federal Regulatlons. and Nuclear Regulatory Commission Issuances. ABSTRACTThe 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 on the southwest rim of the Valles Caldera in New Mexico, where the massive Banco Bonito 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, X R F , X-ray diffraction, and scanning electron microscopy and electron microprobe. Samples were also analyzed for D/H and 39Ar/40Ar 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 meters of the contact, but variations in major and trace element chemistry are small and difficult to distinguish from the natural @re-heating) variability of the rocks. Apart from devitrification, the p~ncipal mineralogic change in tuff near the contact is the development of feldspar-sifica linings on voids in the pumiceous tuff matrix; we found no significant development of zeolites in the samples examined for this study. Age determinations by 394r/40Ar are ambiguous, and do not provide resolution necessary to map paleoisotherms from the heating event.A simple model is developed to predict the temperatures in the obsidian and tuff as a function of time. The model predicts the movement of a boiling front several tens of meters into the tuff over several hundred years, and is relatively insensitive to the assumed saturation. Flowing-steam experiments show that F and C1 are readily lost by the glassy tuff at temperatures as low as 200 "C. Loss of F is consistent with diffusionantrolled release, and could produce condensates with tens to hundreds of ppm F in the region behind the boiling zone. ISeveral mechanisms for producing compositional variations in the tuff are examined. A simple evaporation-capillarity model can explain the concentration of F above background levels. It is shown that the remobilization of silica, predicted by several workers, would probably not be detected in bulk analyses, and may be masked in microscopic analyses by the effects of alkali metasomatism. Significant gas phase transport of metals at the analogue site is shown to be improbable.iii

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Chemical diffusion of fluorine in melts in the system Na2OAl2O3SiO2

Cited by 29 publications

References 23 publications

Halogen diffusion in a basaltic melt

Halogen diffusion in a basaltic melt

Chemical Diffusion in Magmas: An Overview of Experimental Results and Geochemical Applications

The Valles natural analogue project

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