COLLABORATIVE RESEARCH: Crystal Chemistry of Metapelite Minerals in a Petrologic Context

合作研究：岩石学背景下变泥岩矿物的晶体化学

• 批准号: 8817066
• 负责人: Charles Guidotti
• 金额: $ 2.98万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-02-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817066&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Crystal; Chemistry; Metapelite

This proposal requests continuing support for a research program aimed at achieving an understanding of the relationship between mineral crystal chemistry and metamorphic grade and assemblage. Previously-supported work has demonstrated that the ferric iron content and octahedral ordering in biotite vary as a function of both metamorphic grade and co-existing minerals in a given assemblage. Proposed work will expand on these results in two main directions: by looking more closely at the other minerals which coexist with the previously-studied biotites, and by examining other new suites of rocks over a range of different oxidation conditions. Samples will be studied using transmitted and reflected light petrography of phase determination, electron microprobe for major element analysis, Mossbauer spectroscopy for iron redox and site occupancies, and fast neutron activation analysis of oxygen. Our goals are to provide a more comprehen- sive data base for several common solution phases by modern approaches, to illustrate the effects of poor phase characteri- zation on petrologic models (and suggest possible improvements to such models), and finally, to derive "unique" cation substitution models for several of the solution phases we will study.

该提案要求继续支持一项研究， 旨在了解关系的计划 矿物晶体化学和变质程度之间的关系， 集合 以前支持的工作表明， 黑云母中的三价铁含量和八面体有序度随时间变化 变质程度和共生矿物在岩石中的作用 集合。 拟议的工作将在这些成果的基础上加以扩展， 两个主要方向：通过更仔细地观察另一个 与先前研究的黑云母共存的矿物，以及 通过研究其他新的岩石组合， 氧化条件 将使用传输的 和反射光岩相学的相位测定，电子 主量元素分析用微探针， 铁的氧化还原和占位以及快中子活化 氧气分析 我们的目标是提供一个更好的服务- 现代化的几个常见解决方案阶段的专用数据库 方法，以说明差的相位特性的影响， 对岩石学模型进行分析（并提出可能的改进， 这样的模型），最后，得到“独特的”阳离子取代 我们将研究的几个解决方案阶段的模型。