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• W1969944224 abstract "Tracer diffusion coefficients have been determined for Sr, Ba and Na in a natural obsidian at temperatures between 650 and 950°C. The results are D(Sr) = 0.055 exp(−42.7 × 103/RT), D(Ba) = 0.038 exp(−45.1 × 103/RT) and D(Na) = 0.044 exp(−22.9 × 103/RT). The equation forD(Na) is based on data by SIPPEL (1963), CARRON (1968) and present results, all of which fit a single straight line on the Arrhenius plot, D = D0 exp(−ERT). Because the diffusivities depend strongly on ionic charge in addition to ionic radius, simple relationships, such as the Stokes-Einstein equation, which relate diffusivity and viscosity are not applicable to cation diffusion in natural silicate melts. Our results are, however, in approximate agreement with Winchell's compensation law (WINCHELL, 1969, High Temp. Sci. 1, 200–215), which is an empirical straight-line relation between log D0 and E. We apply our results to estimate the effect of diffusion control on the trace element distribution in crystals growing from a granitic melt. If crystal and melt are stationary (diffusive transport only), observable zoning will be produced in the crystal when the ratio of linear growth rate to the diffusion coefficient ranges between 10° and 104. If diffusion control is effective in a boundary layer only, the concentration in the crystal will deviate from the equilibrium value whenever the product of linear growth rate and boundary layer thickness exceeds a value of about 102− Application of the Sr diffusion data to partially molten, granitic rocks (migmatites) yields an equilibration range on the order of tens of centimeters, for a wide range of initial conditions. Sampling of migmatites for the purpose of measuring the whole rock RbSr age of the partial-melting event should therefore be done on a similarly small scale." @default.
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• W1969944224 date "1978-06-01" @default.
• W1969944224 modified "2023-10-07" @default.
• W1969944224 title "Diffusion of Sr, Ba and Na in obsidian" @default.
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• W1969944224 doi "https://doi.org/10.1016/0016-7037(78)90004-2" @default.
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