Combining ultratrace speciation and isotopic analyses of minerals and fluids; metal migration and sequestration in ore deposit and environmental research

结合矿物和流体的超痕量形态分析和同位素分析；

• 批准号: RGPIN-2022-03369
• 负责人: Leybourne, Matthew
• 金额: $ 3.72万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=754991
• 关键词: Combining; ultratrace; speciation; isotopic; analyses

The unifying vision of my research is to develop new geochemical process models and use advances in analytical techniques to: (i) push detection limits to much lower levels, through in situ chemical chromatography and ultra-trace preconcentration, and (ii) enhance our ability to measure novel isotopic systems at ultra-trace concentrations, with a particular focus on combined speciation and isotope determination. This long-term vision will advance our understanding of critical metal mobility and attenuation in the geosphere (primary ore deposit and secondary dispersion processes) and across the interface between the geosphere and the biosphere. The novelty and expected significance of this research is in the combination of greatly improved detection limits and integration with a multi-isotope approach. The research will focus in particular on isotope systems not widely used in geological and environmental research, and in application to fundamental and applied problems across geological and astroparticle physics research. I plan to support and train 1 PDF for 2 years, 3 PhD students, 4 MSc students and 5 BSc students in geochemistry and low-level background determinations in astroparticle physics in this proposal. Real advances in our understanding of metal sources in mineral deposit systems and migration in the secondary environment will be achieved by, for the first time, a systematic combination of speciation (in terms of the minerals metals bind to in Earth materials and how metals are complexed in solution) and isotopic measurements of individual species. Many of the processes of elemental migration from natural accumulations of metals (ore deposits) are poorly understood; lower detection limits, particularly of isotopes and redox sensitive species will enable my research group to better deconvolute different elemental sources and therefore to understand better the processes involved. There is also a need to improve in situ analytical techniques, in particular in terms of isotopic determinations, which are hampered by the inability to perform chromatographic separations, as is traditionally done for isotopic determinations, to isolate the analyte of interest from interfering isotopes. The infrastructure at QFIR, including new equipment purchased with my recently awarded CFI grant, is critical to my research vision and agenda. Because of my position in both Geological Sciences and the Arthur B. McDonald Canadian Astroparticle Physics Research Institute (MI), my research long-term vision and shorter-term goals must address the needs of both communities. Thus, the combination of the research group in the Queen's Facility for Isotope Research, which I co-direct, with the tools and expertise within MI, represents a unique opportunity for geology and astroparticle physics to inform advances across these disciplines. My background and my research group are ideally suited for this cross-disciplinary work.

我研究的统一愿景是开发新的地球化学过程模型并利用分析技术的进步来：（i）通过原位化学色谱法和超痕量预浓缩将检测限降低到更低的水平，以及（ii）增强我们的能力测量超痕量浓度的新型同位素系统，特别关注组合形态形成和同位素测定。这一长期愿景将增进我们对地质圈（原生矿床和二次分散过程）以及地质圈和生物圈之间界面的关键金属流动性和衰减的理解。这项研究的新颖性和预期意义在于大大提高了检测限并与多同位素方法相结合。该研究将特别关注在地质和环境研究中未广泛使用的同位素系统，以及应用于地质和天体粒子物理研究的基础和应用问题。我计划在本提案中支持和培训 1 个 PDF 学生、3 名博士生、4 名硕士生和 5 名理学士学位生，涉及地球化学和天体粒子物理学的低水平背景测定。我们对矿床系统中的金属来源和次生环境中的迁移的理解的真正进步将首次通过物种形成的系统组合来实现（就地球材料中与金属结合的矿物以及金属如何络合而言）在溶液中）和单个物种的同位素测量。 人们对金属自然堆积（矿床）中元素迁移的许多过程知之甚少；较低的检测限，特别是同位素和氧化还原敏感物质的检测限，将使我的研究小组能够更好地解析不同的元素来源，从而更好地了解所涉及的过程。还需要改进原位分析技术，特别是在同位素测定方面，该技术由于无法像传统同位素测定那样进行色谱分离以将感兴趣的分析物与干扰同位素分离而受到阻碍。 QFIR 的基础设施，包括我最近获得的 CFI 资助购买的新设备，对我的研究愿景和议程至关重要。由于我在地质科学和 Arthur B. McDonald 加拿大天体粒子物理研究所 (MI) 的职位，我的研究长期愿景和短期目标必须满足两个社区的需求。因此，我共同领导的女王同位素研究设施的研究小组与 MI 内的工具和专业知识的结合，为地质学和天体粒子物理学提供了一个独特的机会，以促进这些学科的进步。我的背景和我的研究小组非常适合这项跨学科的工作。