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

辉石中的振荡分区：离子探针和建模研究/视觉辅助设备补充

• 批准号: 8903500
• 负责人: Peter Ortoleva
• 金额: $ 11.77万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-06-01 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8903500&HistoricalAwards=false
• 关键词: Oscillatory; Zoning; Pyroxenes; Ion; Probe

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.

在多种矿物质的晶体中观察到了振荡性分区 - 成岩，变质和火成岩。 这种波动性分区通常归因于增长环境中相应的外部施加的变化。 然而，已经通过数学反应传播建模显示，振荡可能是由晶粒生长的动力学自发产生的，与谷物生长的介质中的组件的运输相结合。 将使用联合离子探针和建模方法研究岩浆中生长的辉石中振荡分区的起源。 分区曲线包含大量数据，这些数据将通过晶体生长方程和熔体中的成分迁移来解释。 模型参数将通过可用的谷物生长实验数据和详细的分区曲线来限制。 此外，开发一个能够解释振荡分区的模型将提供一个更可靠的工具来分析常见的结晶现象。 由于各种类型的分区应在定义明确的生长条件范围内进行，因此结果也可用于解释地质记录。