Genesis of gold mineralisation in the Detour-Fenelon belt, Northern Abitibi subprovince

北阿比蒂比省Detour-Fenelon带金矿化成因

• 批准号: 566914-2021
• 负责人: WilliamsJones, Anthony
• 金额: $ 6.37万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=720857
• 关键词: Genesis; gold; mineralisation; Detour; Fenelon

The Abitibi is the World's largest greenstone belt and is mainly responsible for the ~75% of Canadian gold production coming from Ontario and Québec valued at ~$8.4 billion annually. Most of the Abitibi production has come from its well-exposed southern regions. In comparison, the northern regions have seen limited exploration, due to poor outcrop, limited field access and a general sentiment that this part of the Abitibi has lower potential for the discovery of large gold orebodies. This view, however, has changed following the development of the Detour Mine and the recent discovery of a large gold system at Fenelon by the partner, Wallbridge Mining. Although the structural setting is consistent with Fenelon being an orogenic-type deposit, it is atypical in that the gold is accompanied by a relatively high content of copper, pyrrhotite is the dominant sulphide mineral instead of pyrite, and quartz-carbonate veins are conspicuously absent in the main mineralised zones. The research, which will be conducted by a team selected using EDI best-practices, will involve characterising the mineralisation and alteration and their relationships to microstructural and metamorphic features in order to establish the nature of the mineralisation and associated alteration and their relationships to deformation and metamorphism. This will be complemented by mineral and bulk chemical, stable and radiogenic isotope, and fluid inclusion studies study that, in conjunction with a thermodynamic analysis of phase equilibria, will be used to determine the physicochemical conditions of mineralisation and alteration. The resulting framework will be used, in combination with geochronological data, to develop a genetic model for Fenelon that will be applied locally and refined regionally for the Detour-Fenelon belt where Wallbridge has significant interests. The project will provide the company with access to research products that will enable it optimise its exploration strategy for gold mineralisation at Fenelon and for the discovery of new deposits in the Detour-Fenelon belt. Canada will benefit from the development of new tools for exploring for gold in greenstone terrains and from the training of highly qualified personnel needed to conduct such exploration.

阿比蒂比是世界上最大的绿岩带，加拿大约 75% 的黄金产量主要来自安大略省和魁北克省，年产值约 84 亿加元。大部分阿比蒂比产量来自其光照充足的南部地区。相比之下，北部地区的勘探有限，原因是露头较差、现场进入有限，而且普遍认为阿比蒂比地区发现大型金矿体的潜力较低。然而，随着 Detour 矿的开发以及合作伙伴 Wallbridge Mining 最近在 Fenelon 发现大型金矿系统，这种观点发生了变化。虽然构造背景与 Fenelon 是造山型矿床一致，但其非典型性在于金伴生相对较高的铜含量，磁黄铁矿是主要的硫化物矿物而不是黄铁矿，并且在主要矿化带中明显缺乏石英碳酸盐脉。该研究将由使用 EDI 最佳实践选出的团队进行，将涉及表征矿化和蚀变及其与微观结构和变质特征的关系，以便确定矿化和相关蚀变的性质及其与变形和变质作用的关系。这将得到矿物和散装化学、稳定和放射性同位素以及流体包裹体研究的补充，这些研究与相平衡的热力学分析相结合，将用于确定矿化和蚀变的物理化学条件。由此产生的框架将与地质年代学数据相结合，用于开发芬内隆的遗传模型，该模型将在当地应用，并在 Wallbridge 拥有重大利益的绕道-芬内隆带进行区域性完善。该项目将为该公司提供研究产品，使其能够优化 Fenelon 金矿化勘探策略以及在 Detour-Fenelon 带发现新矿床。加拿大将受益于在绿岩地区勘探黄金的新工具的开发以及进行此类勘探所需的高素质人员的培训。