Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56..587w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 56, Issue 2, pp.587-596
Physics
17
Scientific paper
Calcite growing from an aqueous solution containing growth-inhibiting cations such as Mn 2+ can acquire oscillatory zoning of trace elements by this feedback: The growth-induced H + buildup at the growth surface makes the surface more positive, thus preventing inhibiting cations from attaching to the growth sites and accelerating the growth rate. The increase in growth rate in turn further accelerates H + accumulation. This feedback is quantitatively modeled by a system of nonlinear differential equations that takes account of calcite growth, inhibition, diffusion, and mass continuity. For parameter values consistent with actual aqueous-ion diffusivities and concentrations in diagenetic waters, numerical solutions of the system of equations yield both oscillatory calcite growth and oscillatory concentration profiles of trace elements taken up by the calcite. The plausibility of the feedback makes it unnecessary to interpret oscillatory zoning of trace elements in calcite by calling on ad-hoc, large-scale, periodic changes in bulk water chemistry.
Merino Enrique
Wang Yifeng
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