Xenoliths in 2.7 Ga diamondiferous lamprophyres: a record of upper mantle compositions and metasomatism during orogeny

2.7 Ga含钻辉岩中的包体：造山运动期间上地幔成分和交代作用的记录

• 批准号: 250585-2007
• 负责人: Hollings, Peter
• 金额: $ 1.77万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=455725
• 关键词: Xenoliths; 2.7; Ga; diamondiferous; lamprophyres

This study will use upper mantle fragments, or xenoliths, from lamprophyres associated with the world's oldest in situ diamond deposits to investigate the formation of the 2.7 Ga lithosphere. The xenoliths were permeated by hydrous fluids prior to emplacement and therefore are a window into both the composition of the upper mantle and the nature of metasomatic processes during orogeny. The volatile-rich lamprophyres were emplaced at the same time as nearby gold deposits. Understanding the origin and distribution of deep fluid plumbing systems recorded in the xenoliths will resolve the mechanisms responsible for gold mineralisation and will provide an improved understanding of the links between tectonics and metasomatism. These results will have significant implications for the development of ore deposit models and will potentially lead to new discoveries.

这项研究将使用上地幔碎片，或捕虏体，从Lamberres与世界上最古老的原地金刚石矿床，调查的形成2.7 Ga岩石圈。包体在侵位前被含水流体渗透，因此是了解上地幔成分和造山运动期间交代过程性质的一个窗口。富含挥发分的层状岩体与附近的金矿同时侵位。了解捕虏体中记录的深部流体管道系统的起源和分布将解决金矿化的机制，并将提供对构造和交代作用之间联系的更好理解。这些结果将对矿床存款模型的发展具有重要意义，并可能导致新的发现。