Origin of High Grade Gold in Greenstone Gold Deposits and its Relation to Regional Hydrothermal Activity

绿岩金矿床高品位金的成因及其与区域热液活动的关系

• 批准号: 9205646
• 负责人: Stephen Kesler
• 金额: $ 12.4万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-11-15 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9205646&HistoricalAwards=false
• 关键词: Origin; Grade; Gold; Greenstone; Deposits

9205646 Kesler This is a study of several important features of greenstone gold deposits, the largest hypogene gold deposits in the world. Research will be on the Porcupine district, Ontario, where high-grade gold ore is well developed and where we have collected over 400 barren veins from an area of 2000 km2 surrounding the deposits. Work will involve study of the structural setting of high-grade ore, fluid inclusion petrography and microthermometry of ore and barren veins, and inclusion gas, stable isotope and radiogenic isotope analyses of barren and high-grade veins. The research will include analysis of inclusions in gold and related minerals, and an attempt to obtain isotopic ages on minerals from different pasts of sheeted veins to determine the period over which the deposits formed. The results are expected to provide insights into the source of the gold-forming fluid and its relation to the evolution of Archean greenstone terrains, as well as structural and geochemical parameters that could guide exploration for these deposits.

[205646]这是对世界上最大的下第三系金矿——绿岩金矿的几个重要特征的研究。研究将在安大略省的豪猪区进行，那里的高品位金矿很发达，我们已经在矿床周围2000平方公里的区域内收集了400多条贫瘠的矿脉。工作将包括研究高品位矿石的构造背景、矿石和贫矿脉的流体包裹体岩石学和显微测温，以及贫矿脉和高品位矿脉的包裹体气体、稳定同位素和放射性成因同位素分析。这项研究将包括分析黄金和相关矿物中的包裹体，并试图获得来自不同过去的片状矿脉的矿物的同位素年龄，以确定矿床形成的时期。研究结果将为金矿成矿流体的来源及其与太古宙绿岩地形演化的关系，以及指导矿床勘探的构造和地球化学参数提供新的思路。