Accessory minerals as windows into crustal processes

副矿物是了解地壳过程的窗口

• 批准号: 330836-2006
• 负责人: Hanchar, John
• 金额: $ 1.38万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=332553
• 关键词: Accessory; minerals; windows; into; crustal

The main objectives of my proposed research program are to gain a better understanding of how chemical elements become incorporated in so-called accessory minerals, such as zircon (ZrSiO4), within the Earth.  These minerals occur in nature in relatively low abundances, however, they often contain significant quantities of chemical elements such as uranium, thorium, and the rare earth elements (REE).  This research program builds upon current international research collaborations; some recent developments in new research areas; research interests of faculty in Earth Sciences at Memorial University of Newfoundland; and the excellent analytical geochemistry facilities at that institution.  In order to complete some of the proposed research projects, I will establish an experimental high-temperature/high-pressure geochemistry facility to perform the experiments outlined in this proposal; and both a Raman spectroscopy and cathodoluminescence imaging laboratory, in order to characterize the materials synthesized as part of this research program.  Understanding how chemical elements incorporate in accessory minerals has been previously studied, but the mechanisms and processes (i.e., charge balancing, effects or pressure and temperature, fluid or melt composition, structure of the mineral and structure of the melt, etc.) that govern such partitioning remain poorly understood to this day.  Over the next five years, I plan to develop a combined research program that dovetails carefully planned high-temperature/high-pressure experiments with analyses of carefully selected natural samples.  The results from this research program will provide a much better understanding of how extensively these accessory minerals may be used as indicators of the geologic history of the rock samples from which these minerals were separated.

我提出的研究计划的主要目标是更好地了解化学元素如何融入地球内部所谓的副矿物（例如锆石 (ZrSiO4)）中。  这些矿物在自然界中的丰度相对较低，但它们通常含有大量化学元素，例如铀、钍和稀土元素 (REE)。  该研究计划建立在当前国际研究合作的基础上；新研究领域的一些最新进展；纽芬兰纪念大学地球科学系教师的研究兴趣；以及该机构优秀的分析地球化学设施。  为了完成一些拟议的研究项目，我将建立一个实验高温/高压地球化学设施来进行本提案中概述的实验；以及拉曼光谱和阴极发光成像实验室，以表征作为该研究计划的一部分合成的材料。  以前已经研究过化学元素如何融入副矿物中，但控制这种分配的机制和过程（即电荷平衡、压力和温度的影响、流体或熔体成分、矿物结构和熔体结构等）至今仍知之甚少。  在接下来的五年中，我计划开发一个综合研究计划，将精心策划的高温/高压实验与精心挑选的自然样本的分析相结合。  该研究计划的结果将有助于更好地了解这些副矿物可以在多大程度上用作分离这些矿物的岩石样本的地质历史的指标。