Modelling of complex hydrothermal ore-forming fluids in multi-episodic tectonic terranes

多幕式构造地体复杂热液成矿流体模拟

• 批准号: 217031-2008
• 负责人: Marshall, Daniel
• 金额: $ 1.82万
• 依托单位: Simon Fraser 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=496919
• 关键词: Modelling; complex; hydrothermal; ore; forming

Ore deposits and their associated alteration haloes are rare and unique geologic occurrences that provide valuable windows through which to observe and document the tectonic and fluid evolution of Earth over a wide range of pressure, temperature and time conditions. Detailed examination of selected deposit types including; epithermal, intrusion-related and shear-zone hosted gold, iron-oxide copper gold, and gemstones (specifically emerald) will be utilized to establish ore deposit models and tectono-metamorphic histories of their host terranes in key areas of the Canadian Cordillera and other comparative orogens. This research will determine the pressures and temperatures of specific mineral equilibria within selected economic and sub-economic ore deposits, using detailed mapping, petrography, thermodynamic equilibria and a variety of modern analytical techniques including scanning-electron microscopy, energy dispersive spectroscopy, electron microprobe mineral analyses, fluid inclusion studies, laser-ablation inductively coupled mass spectrometry, Raman spectroscopy, C, O, and S stable isotope analyses. The ages of the ore and host rocks will be determined using geological mapping and radiometric dating techniques such as Ar/Ar, Rb/Sr, Sm/Nd and U/Pb isotope studies where applicable. These data will also provide information pertinent to continental break up and fluid mineralizing hydrothermal fluid events in this tectonic setting. In addition, the development of a novel technique to study fluid inclusion compositions using sonoluminescence and sonochemistry will be undertaken.

矿床及其相关的蚀变晕是罕见和独特的地质现象，通过它们可以观察和记录地球在各种压力、温度和时间条件下的构造和流体演化。对选定的存款类型（包括浅成热液、与侵入有关的和剪切带托管的金、氧化铁铜金和宝石（特别是祖母绿））进行详细检查，将用于建立加拿大科迪勒拉和其他比较造山带关键地区的矿石存款模型和其主矿的构造变质历史。这项研究将利用详细的绘图、岩相学、热力学平衡和各种现代分析技术，包括扫描电子显微镜、能量色散光谱、电子探针矿物分析、流体包裹体研究、激光烧蚀感应耦合质谱、拉曼光谱、C、O、S稳定同位素分析。矿石和寄主岩石的年龄将使用地质测绘和放射性测年技术确定，如Ar/Ar、Rb/Sr、Sm/Nd和U/Pb同位素研究（如适用）。这些数据还将提供有关大陆断裂和流体成矿热液流体事件在这个构造背景。此外，还将开发一种利用声致发光和声化学研究流体包裹体成分的新技术。