Trace Element Mobility in the Sub-Solidus: Accessory Mineral Stability, Fluids and the Role of the Rock

亚固相线中的微量元素迁移率：辅助矿物稳定性、流体和岩石的作用

• 批准号: 1119454
• 负责人: Callum Hetherington
• 金额: $ 18.42万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1119454&HistoricalAwards=false
• 关键词: Trace; Element; Mobility; Sub; Solidus

INTELLECTUAL MERIT: This project addresses the role of chemical environment on accessory mineral assemblages and trace element distribution as a consequence of contact metamorphism of country rocks by the Ballachulish Igneous Complex (BIC), Scotland. This area serves as an ideal natural laboratory to investigate hypotheses concerning the role of fluids in controlling accessory mineral stability and reactivity, development of mineral textures, and trace element mobility during metamorphism. Determining the causes of chemical reactivity of accessory minerals, and the consequences for trace element distribution and mobility in rocks, is fundamentally important for the application of trace elements in modeling geologic processes and the utility of accessory mineral data to interpreting crustal evolution. Research results are expected to be of great interest to geochronologists and petrologists who use accessory minerals to understand and quantify geologic processes. BROADER IMPACTS: The project will involve graduate and undergraduate students in all aspects of the research, including instruction and training in the application and use of "state-of-the-art" instrumentation. Students will greatly benefit from interaction with collaborators by diversifying their practical experience and establishing the early stages of a professional network. Undergraduates will be required to prepare poster presentations for Texas Tech Geosciences Research Day, the Texas Tech Undergraduate Research Conference, and will be provided opportunity to attend national scientific meetings. In addition, accessory minerals are natural analogues of some synthetic materials being developed to sequester toxic or harmful materials (e.g. radionuclides). This study will build upon the existing body of experimental work to quantify the role that lithology (chemical environment) has over the composition and behavior of geologic fluids and their impact on mineral stability. Furthermore, many trace elements (e.g. REEs) are economically important and development of improved models for their behavior in the presence of geologic fluids will contribute to models for exploration and development of these strategically important resources.

智力优势：该项目研究了化学环境在苏格兰巴拉丘里什火成岩杂岩（BIC）接触变质作用下的辅助矿物组合和微量元素分布中的作用。该区域是一个理想的自然实验室，可以研究流体在控制辅助矿物稳定性和反应性、矿物结构的发育和变质过程中微量元素的迁移等方面的作用。确定副矿物化学反应性的原因，以及对岩石中微量元素分布和迁移的影响，对于应用微量元素模拟地质过程和利用副矿物数据解释地壳演化具有重要意义。研究结果有望对使用辅助矿物来理解和量化地质过程的地质年代学家和岩石学家产生极大的兴趣。更广泛的影响：该项目将涉及研究生和本科生的研究的各个方面，包括指导和培训在应用和使用“最先进的”仪器。学生将从与合作者的互动中获益，丰富他们的实践经验，并建立一个早期的专业网络。本科生将被要求为德州理工大学地球科学研究日、德州理工大学本科生研究会议准备海报展示，并将有机会参加国家科学会议。此外，辅助矿物是为隔离有毒或有害物质（如放射性核素）而开发的某些合成材料的天然类似物。这项研究将建立在现有实验工作的基础上，以量化岩性（化学环境）对地质流体的组成和行为及其对矿物稳定性的影响的作用。此外，许多微量元素（如稀土元素）具有重要的经济意义，开发改进的模型来研究它们在地质流体存在下的行为，将有助于建立勘探和开发这些具有重要战略意义资源的模型。