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• W2046227584 endingPage "1488" @default.
• W2046227584 startingPage "1473" @default.
• W2046227584 abstract "The surface of a crystal in equilibrium with solute-bearing fluid generally has a composition that differs from that of the bulk crystal. If the crystal is growing, the surface composition may be “captured” by the newly formed lattice to a degree that depends upon the growth rate and the mobility of atoms in the near-surface region: rapid growth promotes this growth “entrapment,” high near-surface mobility works against it. Natural calcites may be particularly susceptible to this kind of kinetic disequilibrium, because their precipitation rates from aqueous solution can be relatively high even at near-ambient temperatures, where ion mobility in the critical near-surface region may be limited. Existing laboratory data on trace-element uptake as a function of calcite growth rate are examined here in the context of recent discoveries concerning the structure, chemistry and kinetics of the near-surface region of calcite crystals. Recent demonstrations that ions can be mobile in the outermost few nanometers of the calcite lattice even at room temperature have the greatest potential to affect growth entrapment. The model of Watson and Liang (1995)—which quantifies entrapment efficiency in terms of growth rate, diffusivity and surface-layer thickness—is modified to include a depth-dependent diffusivity and possible depletion (as well as enrichment) of some elements in the near-surface region. With these changes, the model is shown to be qualitatively consistent with the body of experimental data on trace element uptake during calcite precipitation. This apparent success of the model invites application to stable isotopes. Constraining data are few, but available information on oxygen isotope fractionation can be used to show that growth entrapment at ambient temperatures may (depending on model assumptions) produce deviations from calcite/H2O equilibrium of up to several ‰. The preferred choice of 18O/16O for the surface layer is lighter than the lattice equilibrium value, and leads to a reduction in 18O/16O of crystals grown at higher growth rates, mimicking “vital effects.”" @default.
• W2046227584 created "2016-06-24" @default.
• W2046227584 creator A5073438865 @default.
• W2046227584 date "2004-04-01" @default.
• W2046227584 modified "2023-10-18" @default.
• W2046227584 title "A conceptual model for near-surface kinetic controls on the trace-element and stable isotope composition of abiogenic calcite crystals" @default.
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• W2046227584 doi "https://doi.org/10.1016/j.gca.2003.10.003" @default.
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