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.

Abitibi是世界上最大的绿岩带，加拿大75%的黄金产量来自安大略省和魁北克省，每年价值约84亿美元。Abitibi的大部分产量来自风险敞口很大的南部地区。相比之下，北部地区的勘探有限，原因是露头较差，野外通道有限，以及普遍认为Abitibi这部分地区发现大型金矿的潜力较低。然而，随着Detour矿的开发，以及合作伙伴Wallbridge Mining最近在Fenelon发现了一个大型金矿系统，这种观点已经改变。虽然构造背景与菲尼隆为造山型矿床一致，但不典型的是，金的伴生铜含量较高，磁黄铁矿而不是黄铁矿是主要的硫化物矿物，主要矿化带明显缺乏石英-碳酸盐矿脉。这项研究将由采用EDI最佳实践挑选的团队进行，将涉及矿化和蚀变的特征及其与微结构和变质特征的关系，以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。矿物和大宗化学、稳定和放射性同位素以及流体包裹体研究将与相平衡的热力学分析相结合，用于确定矿化和蚀变的物理化学条件。所产生的框架将与地质年代学数据相结合，用于开发菲尼隆的遗传模型，该模型将在当地应用，并在沃布里奇拥有重大利益的德图菲尼隆带进行区域改进。该项目将为该公司提供研究产品，使其能够优化其在Fenelon金矿成矿的勘探战略，并在Detour-Fenelon带发现新的矿床。加拿大将受益于开发在绿岩地区勘探金矿的新工具，以及培训进行这种勘探所需的高素质人员。