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: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=595476
• 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.

传统上为Cu-au-Mo-Ag开采的斑岩和表皮沉积物可能会拥有铂类元素的重要资源（PGE；尤其是PD和PT）。在加拿大，卑诗省寄主的斑岩沉积物包含可能被归类为可分类为重要的未来PGE资源的区域（〜1-6克/吨的PD；参考文献1）。与传统的镁铁质 - 乌尔特拉玛菲克环境中的沉积物相比，含有PGE的斑岩和表皮系统在经济和环境上比大多数已知的岩浆硫化物沉积物在经济和环境上更可取，因为开放坑方法的采矿成本较低，并且矿石和废物的高酸性延误潜力。随着对加拿大工业和公众作为能源消费者的压力越来越大，要满足哥本哈根协定中设定的排放目标（从2005年到2020年，从2005年的水平降低了17％），越来越紧迫的PGE供应将在PGE供应量供应数百万盎司的供应，这将在催化剂和促进型材料的替代媒体中的能源技术中起着至关重要的作用。热，潮汐）。但是，PGE探索的总体成功率非常低，并且不可能从加拿大的“传统”环境中获得足够的长期资源基础。在斑岩表皮环境中，对PGE起源的理解非常差，并且可以防止在可能包含或可能不包含金属经济浓度的地质寄主环境之间进行成本效益和成功的歧视。拟议的研究将提高我们对非典型，非传统地质环境中PGE沉积物的起源的科学知识，并且一般而言，将阐明有关造成造基质带的地球化学和岩石学过程的不确定性，这些过程是导致负责从地幔转移到浅层甲壳的矿石转移矿石金属的造成山地。这项研究还将在加拿大和其他地方提供经过现场测试的地质标准，以歧视PGE-Barren和PGE-Fertile Arc Terranes。