Dynamic model of oscillatory zoning of trace elements in calcite: Double layer, inhibition, and self-organization
Dynamic model of oscillatory zoning of trace elements in calcite: Double layer, inhibition, and self-organization
复制标题
方解石中微量元素振荡分区的动态模型：双层、抑制和自组织
DOI：
10.1016/0016-7037(92)90083-u
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发表时间：
1992
影响因子：
5
通讯作者：
["Yifeng Wang
中科院分区：
文献类型：
--
作者：
["Yifeng Wang
Calcite growing from an aqueous solution containing growth-inhibiting cations such as Mn2+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.
