Source-migration-trap models for precious metal deposits

贵金属矿床的源-迁移-圈闭模型

• 批准号: 227487-2009
• 负责人: Olivo, Gema
• 金额: $ 2.19万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=496946
• 关键词: Source; migration; trap; models; precious

The processes related to the formation of anomalous concentrations of elements in the earth crust, also known as ore deposits, can be unraveled by evaluating source-migration-trap models at various scales of observation (from global to deposit-scale). My research over the next years will concentrate mainly on understanding the processes that are critical in the formation of world-class gold deposits (>3 million ounces of gold) hosted in sedimentary sequences. Two areas have been selected to focus the investigations over the next five years: Northern Nevada which hosts the Goldstrike Deposit (> 50 million ounces gold) and the Brazilia Belt, which hosts the Morro do Ouro Deposit (> 18 million ounces gold). This research program involves both regional and local-scale multidisciplinary studies, and the application of state-of-the art techniques to bring new insights into understanding the formation of large accumulations of gold in the upper crust. This will lead to the development of integrated source-migration-trap models and will help to refine exploration strategies of mining companies, increasing the potential for successful exploration programs in Canada, in areas sharing similar characteristics. Furthermore, the new integrated approach to investigate the mode of occurrence of gold and trace elements in sulfides also has important applications to the field of material and environmental sciences. Although arsenian pyrite, an arsenic-bearing iron sulphide, is widely known for its role as an important host for gold in ore deposits, it is also a major source of arsenic in sedimentary rocks, mine wastes and tailings. Understanding its crystal structure and crystal chemistry will be very important to evaluate its behavior during processing and weathering, and to mitigate problems related to environmental contamination by arsenic and related elements. This research program will involve training of highly qualified geoscientists who will be working in multidisciplinary collaboration between industry, government agencies, and colleagues from other research centers.

与地壳中元素异常浓度形成相关的过程，也称为矿床，可以通过评估各种观察尺度（从全球到矿床尺度）的源-迁移-陷阱模型来解开。在接下来的几年里，我的研究将主要集中在了解沉积序列中世界级金矿（> 300万盎司黄金）形成的关键过程。已选定两个地区作为今后五年的调查重点：拥有Goldstrike存款（> 5000万盎司黄金）的北方内华达州和拥有Morro do Ouro存款（> 1800万盎司黄金）的巴西带。该研究计划涉及区域和地方规模的多学科研究，以及最先进技术的应用，为理解上地壳中大量黄金积累的形成带来新的见解。这将导致综合源-迁移-圈闭模型的发展，并将有助于完善矿业公司的勘探战略，增加加拿大在具有相似特征的地区成功勘探计划的潜力。此外，综合研究硫化物中金和微量元素赋存状态的新方法在材料和环境科学领域也有重要应用。虽然砷黄铁矿是一种含砷的铁硫化物，因其作为矿床中金的重要宿主而广为人知，但它也是沉积岩、矿山废物和尾矿中砷的主要来源。了解其晶体结构和晶体化学对于评估其在加工和风化过程中的行为以及减轻砷和相关元素对环境的污染问题非常重要。该研究计划将涉及培训高素质的地球科学家，他们将在工业，政府机构和其他研究中心的同事之间进行多学科合作。