A Petrologic and Ion-Probe Study of Hornblende Gabbro Cumulates from Medicine Lake Volcano: An Evaluation of Competing Mechanisms of Calc-Alkaline Fractional...

梅迪辛湖火山角闪石辉长岩堆积物的岩石学和离子探针研究：钙碱性分数竞争机制的评估...

• 批准号: 9117246
• 负责人: James Brophy
• 金额: $ 7.01万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117246&HistoricalAwards=false
• 关键词: Petrologic; Ion; Probe; Study; Hornblende

Fractional crystallization is one of the most important yet most poorly understood of all igneous petrologic processes. One key to understanding how fractional crystallization operates is through the study of magmatic cumulates generated during a composition gap-forming event. This study will include detailed textural (Universal-Stage), geochemical, micro-probe and, most significantly, ion-probe investigations of the Medicine Lake cumulates. Textural studies will concentrate on the degree of preferred mineral orientation. Geochemical studies will characterize the major and trace element variability in both the cumulates and associated magmas. Micro-probe and ion-probe studies will determine major and trace element zonation styles in individual cumulate minerals, as well as the degree of sympathetic compositional variation among neighboring cumulate minerals. Altogether, these complimentary lines of evidence will be used to assess the physical nature of fractional crystallization at Medicine Lake and, by inference, in other calc-alkaline magmatic systems of similar style.

分级结晶是最重要的结晶之一， 对所有的火成岩岩石学过程知之甚少。 的一个关键 了解分步结晶是如何运作的， 对合成过程中产生的岩浆堆积物的研究 间隙形成事件 这项研究将包括详细的纹理 （通用阶段），地球化学，微探针， 值得注意的是，对梅迪辛湖的离子探测 累积。 文本研究将集中在程度 优选矿物取向。 地球化学研究将 表征的主要和微量元素的变化， 堆积物和相关的岩浆。 微探针和离子探针研究 将决定主元素和微量元素分带样式， 个人累积矿物质，以及交感神经的程度， 相邻堆晶矿物之间的成分变化。 总之，这些补充性的证据将用于 评估分级结晶的物理性质. 梅迪辛湖和其他钙碱性岩浆 类似风格的系统。