Development of a magmatic-hydrothermal model for the genesis of platinum-group element (PGE) deposits in porphyry and epithermal settings in the Canadian Cordillera

开发加拿大科迪勒拉山脉斑岩和浅成热液环境中铂族元素 (PGE) 矿床成因的岩浆热液模型

• 批准号: 341762-2012
• 负责人: Hanley, Jacob
• 金额: $ 2.77万
• 依托单位: Saint Mary's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572358
• 关键词: Development; magmatic; hydrothermal; model; genesis

Porphyry and epithermal deposits, traditionally mined for Cu-Au-Mo-Ag, may host important resources of platinum-group elements (PGE; notably Pd and Pt). In Canada, the province of B.C. hosts porphyry deposits that contain zones that may potentially be classified as significant future PGE resources (~1-6 grams/ton of Pd; Ref. 1). Compared to deposits in traditional mafic-ultramafic settings, PGE-bearing porphyry and epithermal systems are economically and environmentally preferable to most known magmatic sulfide deposits because of the lower cost of mining by open pit methods, and the high acid-buffering potential of ores and wastes. With increasing pressure on Canadian industry and the public as energy consumers to meet emissions targets set in motion under the Copenhagen Accord (17% reduction from 2005 levels by 2020), there is a growing urgency for multi-million ounce supplies of PGE that will play a vital role in the production of catalysts, exchange membranes for hydrogen purification, fuel storage media and components for a variety of alternative energy technologies (wind, solar thermal, tidal). However, the overall success rate for PGE exploration is very low, and it is unlikely that an adequate long-term resource base from "traditional" settings in Canada will stabilize. In porphyry-epithermal settings, understanding of the origin of PGE is very poor and prevents cost-effective and successful discrimination between geological host environments that may or may not contain economic concentrations of the metals. The proposed study will increase our scientific knowledge of the origin of PGE deposits in atypical, non-traditional geological environments, and in general, will elucidate uncertainties about the geochemical and petrological processes active in orogenic belts that are responsible for the transfer ore metals from the mantle to the shallow crust. The research will also provide mining exploration companies in Canada and elsewhere with field-tested geological criteria to enable discrimination between PGE-barren and PGE-fertile arc terranes.

传统上开采铜-金-钼-银的斑岩矿床和浅成热液矿床可能蕴藏着重要的铂族元素（PGE；特别是钯和铂）资源。在加拿大，BC省拥有斑岩矿床，其中包含可能被归类为未来重要 PGE 资源的区域（约 1-6 克/吨 Pd；参考文献 1）。与传统镁铁质-超镁铁质环境中的矿床相比，含铂族元素的斑岩和浅成热液系统在经济和环境上都优于大多数已知的岩浆硫化物矿床，因为露天开采方法的采矿成本较低，并且矿石和矿床具有较高的酸缓冲潜力。废物。随着加拿大工业和公众作为能源消费者面临越来越大的压力，要求实现《哥本哈根协议》规定的排放目标（到 2020 年比 2005 年的水平减少 17%），供应数百万盎司的 PGE 的紧迫性越来越大，这将发挥作用在催化剂、氢纯化交换膜、燃料储存介质和各种替代能源技术（风能、太阳能热能、潮汐能）组件的生产中发挥着至关重要的作用。然而，铂族金属勘探的总体成功率非常低，加拿大“传统”环境中的充足长期资源基础不太可能稳定下来。在斑岩-浅成热液环境中，对铂族元素的起源了解非常少，并且阻碍了对可能含有或不含有经济浓度的金属的地质宿主环境进行具有成本效益和成功的区分。拟议的研究将增加我们对非典型、非传统地质环境中铂族元素矿床起源的科学认识，并且一般来说，将阐明造山带中活跃的地球化学和岩石学过程的不确定性，这些过程负责将矿石金属从造山带转移出来。地幔到浅地壳。该研究还将为加拿大和其他地方的采矿勘探公司提供经过现场测试的地质标准，以便区分贫瘠和富含 PGE 的弧地体。