Metallogeny of the Avalon Terrane During the Late Neoproterozoic

新元古代晚期阿瓦隆地体成矿作用

• 批准号: RGPIN-2017-05037
• 负责人: Layne, Graham
• 金额: $ 1.6万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=656857
• 关键词: Metallogeny; Avalon; Terrane; During; Late

This research program is focused on multiple, regionally extensive, metallogenetic episodes in the Neoproterozoic Avalon Terrane in Newfoundland (NL), and closely equivalent terranes in Nova Scotia (Mira Terrane) and New Brunswick (Caledonia Terrane). To date we recognize at least three distinct episodes of granitoid plutonism within the Avalon Terrane of NL (ca. 620 Ma, 585-575 Ma and 565 Ma) that show potential as fertile episodes for intrusion-related mineral deposits. These are under-examined, and under-explored, in terms of their potential for economic mineral resources. The program will provide detailed characterization of the features of both shallow epithermal Au-Ag and related porphyry-Cu(-Au) deposits within this terrane, incorporating determinations of the timing, depositional environment, and tectonic affinity of both the host volcano-sedimentary rocks and the parent plutons. This knowledge will be used to inform models for evolution of the Avalon Terrane in Atlantic Canada.******The scientific and technical approach will include:***- Petrographic, lithogeochemical and radiogenic isotope analysis (εNd) of host rocks, with particular relevance to establishing the exact style of arc volcanism that was contemporaneous with episodes of ore formation.***- U-Pb geochronology of parent granitoids and affiliated volcanic rocks, and Re-Os geochronology of molybdenite mineralization, to determine explicit timing of ore-forming events.***It will emphasize development and application of advanced microanalytical technologies, in particular,***- Sulfur isotope microanalysis, specifically to discern pyrite genetically associated with epithermal ore mineralization from that biogenically precipitated in sediments in near-surface (or shallow subsurface) intra-caldera waters contemporaneous with ore deposition.***- Integrated macro- (Visible/Infrared Reflectance Spectroscopy (VIRS)) and micro-scale analysis of phyllosilicate minerals to model alteration styles and zoning at the deposit scale. This will include advancement of Raman Spectroscopy, including micro- to nano-scale Tip Enhanced Raman Spectroscopy (TERS), for the study of alteration minerals in ore deposits. TERS has exciting potential to characterize extremely small volumes of alteration intimately associated with precious metal mineralization, enabling a deeper understanding of the mechanisms of Au-Ag precipitation in these systems.******The research program is designed to provide HQP (Highly Qualified Personnel) training and geoscience that drives innovation in mineral exploration. The knowledge developed in this study is directly transferable to the effective exploration, development and mining of mineral deposits in the Avalon Terrane. A longer term goal is to enhance understanding of the subaerial paleo-environment during the emergence of the first metazoan fauna in the Ediacaran period (635-541Ma). **

该研究计划的重点是纽芬兰（NL）的新元古代阿瓦隆地座（NL）的多个区域广泛的金属遗传发作，以及新斯科舍省（Mira Terrane）和New Brunswick（Caledonia terrane）的近等效式地形。迄今为止，我们至少认识到NL的Avalon Terrane（大约620 Ma，585-575 MA和565 MA）中至少三个不同的花岗岩纯化发作，这些发作显示出可能作为侵入相关矿物质的肥沃发作的潜力。就其具有经济矿产资源的潜力而言，这些都是不足的，并且探索了不足。该程序将详细描述浅层表皮Au-ag和相关的斑岩-Cu（-au）沉积物的特征，并结合了宿主火山式岩石岩石和父型Plutons的时机，沉积环境和构造亲和力的确定。这些知识将用于告知模型以进化加拿大大西洋的阿瓦隆地座。花纹型和关联火山岩以及钼矿化的重新体系学，以确定矿石形成事件的明确时机。近地表（或浅层地下）中的沉积物中的矿物质水域具有矿石沉积。这将包括拉曼光谱的进步，包括微型至纳米尺度的尖端增强的拉曼光谱法（TERS），以研究矿石沉积中的矿物质矿物质。 TER具有令人兴奋的潜力，可以表征与珍贵金属矿化密切相关的大量改变，从而更深入地了解这些系统中Au-Ag精度的机制。这项研究中发展的知识直接转移到了阿瓦隆地层中矿藏的有效勘探，开发和采矿。一个长期的目标是在Ediacaran时期（635-541ma）中提高对第一个后生动物动物区系的出现期间对亚地区古环境的理解。 **