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

9205646凯斯勒这是对绿岩金矿的几个重要特征的研究，绿岩金矿是世界上最大的浅成金矿。研究将在安大略省的波丘派恩区进行，那里的高品位金矿很发达，我们在那里从矿藏周围2000平方公里的面积中收集了400多个贫瘠的矿脉。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相学和显微测温，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同位素分析。这项研究将包括分析金和相关矿物中的包裹体，并试图获得不同板状矿脉过去矿物的同位素年龄，以确定矿床形成的时期。这些结果有望为成金流体的来源及其与太古宙绿岩地体演化的关系提供见解，以及可能指导这些矿床勘探的构造和地球化学参数。

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.