Oscillatory Zoning In Pyroxenes: Ion Probe and Modeling Studies/Visual Aid Equipment Supplement

在成岩、变质和火成岩条件下生长的各种矿物的晶体中都观察到了振荡环带。这种起伏不定的分区通常被归因于生长环境中相应的、外部强加的变化。然而，通过数学反应-输运模型表明，振荡可以自发地产生于颗粒生长的动力学耦合到颗粒生长的介质中的组分的输运。用离子探针和模拟相结合的方法研究岩浆中辉石的振荡分带成因。分带剖面包含大量数据，这些数据将通过熔体中的晶体生长和组分迁移方程进行解释。模型参数将受现有的晶粒生长实验数据和详细的分区剖面的限制。此外，开发一个能够解释振荡分带的模型将为分析常见的结晶现象提供一个更可靠的工具。因为各种类型的分带应该发生在明确定义的生长条件范围内，所以这些结果也可以用来解释地质记录。

Oscillatory zoning has been observed in crystals of a variety of minerals grown under a range of conditions - diagenetic, metamorphic, and igneous. Such undulatory zoning has often been attributed to corresponding, externally imposed variations in the growth environment. However, it has been shown via mathematical reaction-transport modeling that oscillation may arise spontaneously from the kinetics of grain growth coupled to transport of components in the medium from which the grain grows. The genesis of oscillatory zoning in pyroxene grown in magmas will be investigated using a combined ion probe and modeling approach. The zoning profiles contain a wealth of data which will be interpreted via equations of crystal growth and component migration in the melt. Model parameters will be constrained via available grain growth experimental data and the detailed zoning profiles. Developing a model capable of explaining oscillatory zoning will, in addition, give a more reliable tool for analyzing common crystallization phenomena. Because zoning of various types should occur in well defined ranges of growth conditions, the results also can be used to interpret the geologic record.