The source of fluids associated with critical-mineral formation in the Mulgrave Lake, Barrington, Shelburne, and Port Mouton plutons, Nova Scotia

新斯科舍省马尔格雷夫湖、巴灵顿、谢尔本和木顿港岩体中与关键矿物形成相关的流体来源

• 批准号: 571305-2021
• 负责人: Fayek, MostafaM
• 金额: $ 3.28万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=751060
• 关键词: source; fluids; associated; critical; mineral

The goal of the proposed research is to provide an understanding of the processes required to form critical element deposits in Nova Scotia. To achieve our goal, we plan to: (1) develop an inventory and paragenesis for the critical minerals in the plutons south and east of the main body of the South Mountain Batholith; (2) analyze the H and O isotopic composition of the micas/feldspars that are associated with or host critical elements such as Nb and Li, using our in situ SIMS technique to determine the source of the fluid (magmatic vs. hydrothermal); (3) date these micas/feldspars using Ar-Ar to determine the timing of these fluids; and (4) analyze the bulk rare earth elements (REE) contents of these intrusive rocks to determine if they have unique REE patterns that can be used as an exploration tool.Our research will focus on the Nb-rich Mulgrave Lake pluton and the Be-Mo-rich Port Mouton, Shelburne, and Barrington Passage plutons and associated pegmatites. The Nova Scotia Geological Survey (NSGS) will use these data to ultimately refine the geological and geochemical models for critical element deposits in Nova Scotia. Data interpretation and presentation include statistical analyses that incorporate both spatial and temporal relations of the mineralogical and geochemical data, identification of key processes that resulted in ore formation, and estimates of the duration of fluid events required to generate critical element ores. This work will significantly contribute to our knowledge of igneous systems that host these deposits, and in particular the processes that transport, concentrate, and modify critical elements. The proposed research will train 1 MSc student and 1 undergraduate student in critical element ore deposits. Geologists from the NSGS will contribute to the training of these students in field work techniques.

拟议研究的目标是了解新斯科舍省形成关键元素矿床所需的过程。 为实现我们的目标，我们计划：（1）对南山岩基主体以南和以东的岩体进行关键矿物的清查和共生； (2) 使用我们的原位 SIMS 技术分析与 Nb 和 Li 等关键元素相关或含有关键元素的云母/长石的 H 和 O 同位素组成，以确定流体来源（岩浆与热液）； (3) 使用 Ar-Ar 测定这些云母/长石的年代，以确定这些流体的出现时间； (4) 分析这些侵入岩的大量稀土元素 (REE) 含量，以确定它们是否具有可用作勘探工具的独特稀土元素模式。我们的研究将集中在富铌 Mulgrave Lake 岩体和 Be 岩体上。 - 富含钼的木顿港、谢尔本和巴林顿通道岩体及相关伟晶岩。新斯科舍省地质调查局 (NSGS) 将利用这些数据最终完善新斯科舍省关键元素矿床的地质和地球化学模型。 数据解释和呈现包括统计分析，其中结合了矿物学和地球化学数据的空间和时间关系，识别导致矿石形成的关键过程，以及估计生成关键元素矿石所需的流体事件的持续时间。 这项工作将极大地有助于我们了解这些沉积物的火成系统，特别是运输、浓缩和改变关键元素的过程。 拟议的研究将培训 1 名硕士生和 1 名本科生，研究关键元素矿床。 NSGS 的地质学家将为这些学生提供现场工作技术培训。