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.

在一种晶体中观察到振荡环带， 各种矿物在不同条件下生长- 成岩、变质和火成岩。 这种起伏的地带性 通常被归因于相应的，外部强加的 生长环境的变化。 然而，已经表明， 通过数学反应传输模型，振荡可以 自发地产生于晶粒生长的动力学， 在谷物生长的介质中组分的运输。 岩浆中辉石振荡环带的成因 将使用组合离子探针和建模进行研究 approach. 分区概况包含大量数据， 将通过晶体生长方程和组分方程来解释 熔体中的迁移。 模型参数将通过 现有的晶粒长大实验数据和详细的分区 数据区. 开发一个能够解释振荡分区的模型 此外，还将提供一个更可靠的工具来分析常见的 结晶现象 因为各种类型的分区 应该发生在明确定义的生长条件范围内， 结果也可用于解释地质记录。