Structural controls on Ni-Cu sulfide mineralization and metal mobility at the Garson Mine, Sudbury

萨德伯里加森矿对镍铜硫化物矿化和金属流动性的结构控制

• 批准号: 340329-2006
• 负责人: Lafrance, Bruno
• 金额: $ 1.21万
• 依托单位: Laurentian University of Sudbury
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=399173
• 关键词: Structural; controls; Ni; Cu; sulfide

The Garson Mine is one of several nickel-copper mines in the world-class Sudbury mining camp in Ontario.  Two thirds of Canada's annual nickel production is from Sudbury mines.  The nickel-copper deposits occur at the base of the 1850 million years old Sudbury Igneous Complex.  They formed as heavy sulphide metal droplets segregated from the cooling magma and accumulated along the floor of the igneous complex.  Several millions of years after crystallization of the complex, the Sudbury rocks were faulted, folded, and sheared during tectonic collisional growth of the North American continent.  Several deposits, including the Garson deposit, were deformed during this tectonic event.  This changed the shape of the deposits, their metal content, and distribution of sulphide minerals.  At the Garson Mine, Ni-Cu sulfide mineralization occurs within two main shear zones.  The degree to which shear deformation has affected the nature and distribution of the mineralization is uncertain.  Mineralization either remained largely in place during deformation, or was mobilized during ductile flow of sulfide minerals as high-temperature malleable pastes and during transport of metals and sulfur in solution within hydrothermal fluids that migrated along the shear zones.  The proposed research will establish the degree to which sulfide minerals have been affected by this deformation and will determine the relative importance of solution transport versus ductile solid flow during mobilization of the sulfides.  It will further characterize favorable structural sites for the concentration of metals along the shear zones and will identify geochemical enrichment /depletion signatures that can be used to vector toward nickel-copper mineralization.

加森矿是安大略省世界级萨德伯里矿区的几个镍铜矿之一。加拿大每年镍产量的三分之二来自萨德伯里矿。镍铜矿床位于拥有 18.5 亿年历史的萨德伯里矿床底部。它们形成为从冷却的岩浆中分离出来的重硫化物金属液滴，并沿着火成岩的底部积累。复杂的结晶后数百万年，萨德伯里岩石在北美大陆的构造碰撞生长过程中发生断层、褶皱和剪切。包括加森矿床在内的一些矿床在这次构造事件中发生了变形。矿床的形状、金属含量以及硫化物矿物的分布 在 Garson 矿，镍铜硫化物矿化发生在两个区域内。主要剪切带。剪切变形对矿化性质和分布的影响程度尚不确定。矿化要么在变形过程中大部分保留在原处，要么在硫化物矿物作为高温可延展性膏体的延性流动过程中以及在运输过程中被移动。沿着剪切带迁移的热液溶液中的金属和硫。​拟议的研究将确定硫化物矿物的程度受到这种变形的影响，并将确定硫化物移动过程中溶液传输与延性固体流动的重要性。它将进一步表征沿着剪切带的金属富集的有利结构位置，并将识别地球化学富集/消耗相对特征，用于引导镍铜矿化。