Impact of metamorphism and deformation on metal mobility at the microscale to nanoscale in orogenic gold systems

造山金系统中变质作用和变形对微米级至纳米级金属流动性的影响

• 批准号: RGPIN-2022-04118
• 负责人: Brueckner, Stefanie
• 金额: $ 1.89万
• 依托单位: University of Manitoba
• 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=754962
• 关键词: Impact; metamorphism; deformation; metal; mobility

Metamorphism and deformation impact the mobility of metals (e.g., Au, Bi, Te) in hydrothermal mineral systems including orogenic gold systems which are a major contributor to Canada's leading role as Au producer. The impact of deformation and metamorphism is well constrained on the district and deposit scale but poorly understood on the microscale to nanoscale specifically within sulfides and quartz. The proposed research program investigates how metal mobility in orogenic gold systems within the Uchi Subprovince of Manitoba and Ontario is impacted by varying degrees of metamorphism and deformation. Specifically, the role of microstructures in pyrite and quartz is investigated regarding metal (Au, Bi, Te) mobility and variations in metal abundance on the grain scale. The program will provide opportunities to train ten highly qualified personnel by exposing them to a variety of fieldwork methods including the use of handheld instrumentation in combination with cutting-edge micro- and nano-technologies to constrain the research questions. This training will prepare HQP for highly sought-after roles in the natural sciences including economic geology, geometallurgy, material sciences, engineering and/or geochemical analyses. The results of my program will impact our understanding what role metamorphism and deformation play in pyrite and quartz regarding metal mobility; what processes cause metal mobility during metamorphism and deformation at different metamorphic conditions; and how metals are transported during deformation and metamorphism on the microscale and nanoscale. This advances our knowledge of metal mobility on the grain scale in metamorphosed and deformed orogenic gold systems and the used methods can be applied to other metamorphosed and deformed mineral systems domestically and globally. Additionally, the results will improve metal recovery rates and hence impact metallurgical processes since knowledge is gained where and how metals accumulate in deformed sulfides and quartz. Finally, the research program will make meaningful advancements on the combined field of microtexture, microstructure, and geochemical micro- and nano-analyses applied to geological processes, which is currently under-represented in its investigation within Canada.

变质作用和变形作用影响热液矿物系统中金属（如Au、Bi、Te）的流动性，包括造山金系统，这是加拿大作为金生产国的主要贡献者。变形和变质作用对地区和矿床规模的影响受到很好的限制，但对微至纳米尺度特别是硫化物和石英的影响知之甚少。提出的研究计划调查了在马尼托巴省和安大略省的Uchi副省的造山带金系统中的金属流动性如何受到不同程度的变质和变形的影响。具体而言，研究了黄铁矿和石英中金属（Au, Bi, Te）迁移率和晶粒尺度上金属丰度变化的微观结构的作用。该项目将提供培训10名高素质人员的机会，让他们接触各种实地工作方法，包括使用手持仪器与尖端微纳米技术相结合，以限制研究问题。该培训将为HQP在经济地质学、地质冶金学、材料科学、工程和/或地球化学分析等自然科学领域的热门职位做好准备。我的项目结果将影响我们对变质和变形在黄铁矿和石英中对金属流动性的作用的理解；在不同变质条件下，是什么过程导致了变质过程中的金属迁移和变形？以及金属在微观和纳米尺度的变形和变质过程中是如何运输的。这进一步提高了我们对变质和变形造山带金系统中金属在颗粒尺度上的流动性的认识，所采用的方法可应用于国内外其他变质和变形成矿系统。此外，该结果将提高金属回收率，从而影响冶金工艺，因为可以获得金属在变形硫化物和石英中积聚的位置和方式。最后，该研究项目将在应用于地质过程的显微结构、微观结构和地球化学微观和纳米分析的综合领域取得有意义的进展，这些领域目前在加拿大的研究中代表性不足。