Volcanological, structural, and metamorphic reconstruction of the Snow Lake VMS district

雪湖 VMS 区的火山、构造和变质重建

• 批准号: 430238-2012
• 负责人: Gibson, Harold
• 金额: $ 3.14万
• 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: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=552540
• 关键词: Volcanological; structural; metamorphic; reconstruction; Snow

Volcanogenic massive sulphide (VMS) deposits are copper, zinc and lead deposits that form by the precipitation of metals from black smokers on the sea floor. The deposits form along mid-oceanic ridges, in oceanic volcanic island arcs, and in basins behind the arcs. In ancient rocks, VMS deposits are typically found in volcanic island arc and back arc environments, likely due to the preservation of arc versus mid-oceanic ridge environments. These deposits produce a significant proportion of the world's supply of zinc and are important source of copper and silver as well as rare metals that are used by the "high-tech" industry sector. In Manitoba, VMS deposits are associated with the Snow Lake volcanic island arc and backarc that formed early during the opening of the ancient Manikewan Ocean and were deformed during closure of this ocean due to the movement and collision of tectonic plates. The goal of our project is to reconstruct the tectonic, magmatic, volcanic and metamorphic evolution of the Snow Lake volcanic island arc in order to better understand the metallogenesis of its contained VMS deposits, and to provide new constraints on the evolution and metallogeny of ancient arc volcanic sequences in northern Manitoba and Saskatchewan. The direct beneficiary of the new knowledge generated, and of the highly-qualified geoscientists trained during this research, is the Canadian mining and exploration industry who explore for VMS and related ore deposits in Canada, and globally, and indirectly the many rural, northern Canadian communities that depend on mining as their main economic driver. The minerals and mining sector contributes significantly to the Gross Domestic Product (GDP) of Canada, ($32 billion in 2009) and mining accounts for 19% of Canada's goods exports. Successful exploration is crucial to the sustainability of the Canadian Mining Industry and, therefore, to the well being of all Canadians.

火山块状硫化物 (VMS) 矿床是铜、锌和铅矿床，由黑烟囱中的金属在海底沉淀而形成。这些沉积物沿着洋中脊、海洋火山岛弧和弧后的盆地形成。 在古代岩石中，VMS 沉积物通常发现于火山岛弧和弧后环境中，这可能是由于火山岛弧与大洋中脊环境的保存所致。 这些矿床生产的锌占世界供应量的很大一部分，也是铜、银以及“高科技”工业部门使用的稀有金属的重要来源。 在马尼托巴省，VMS 沉积物与雪湖火山岛弧和弧后有关，这些火山岛弧和弧后形成于古代马尼科湾海洋开放期间，并在该海洋闭合期间由于构造板块的运动和碰撞而变形。 本项目的目标是重建雪湖火山岛弧的构造、岩浆、火山和变质演化过程，以更好地认识其所含VMS矿床的成矿作用，为古岛弧的演化和成矿提供新的约束马尼托巴省北部和萨斯喀彻温省的火山序列。所产生的新知识以及在这项研究中接受培训的高素质地球科学家的直接受益者是加拿大采矿和勘探行业，他们在加拿大和全球范围内勘探 VMS 和相关矿床，并间接受益于加拿大北部的许多农村地区。依赖采矿作为主要经济驱动力的社区。矿产和采矿业对加拿大国内生产总值 (GDP) 做出了重大贡献（2009 年为 320 亿加元），采矿业占加拿大货物出口的 19%。成功的勘探对于加拿大采矿业的可持续发展至关重要，因此也关系到所有加拿大人的福祉。