澳大利亚伊尔岗地块诺斯曼-维卢纳绿岩带金矿成矿作用

诺斯曼-维卢纳金成矿带位于澳大利亚西澳克拉通伊尔岗地块东部黄金省次级地体内，是澳大利亚最重要的绿岩带型金矿成矿区。区内矿床可分为3类：剪切带中的蚀变晕±石英脉型，是区内最为重要的矿化类型，典型矿床为卡尔古利金哩矿床，矿床赋存在金哩粗玄岩中，矿化发生在绢云母-黄铁矿化蚀变带内；石英网脉型，典型矿床为卡尔古利夏洛特山金矿床。矿床也产于金哩粗玄岩中，矿化主要发生在硅化外围的碳酸盐-黄铁矿化蚀变带内；纹层状石英脉型，矿化表现出层控的特点，并多发育绿泥石化。通过对区域和典型矿床地质特征和区域成矿特征的总结，认为诺斯曼-维卢纳金成矿带的金主要赋存于铁硫化物或毒砂中，矿化与大规模的蚀变作用联系密切，太古宙绿岩带和条带状铁建造、深大断裂、褶皱等因素控制了矿床的分布。在此基础上，总结了绿岩带型金矿的找矿标志，并为在区内找矿提出若干建议。

An analysis of gold mineralization in Norseman-Wiluna greenstone belt,Yilgarn carton,Australia

Located in Eastern gold ore fields terrane of Yilgarn block, Western Australia craton of Australia, the Norseman-Wiluna gold metallogenic belt is the most important gold concentration area in Australia. Three kinds of mineralization can be identified. The altered shear zone＋quartz vein type is the most important mineralization type, and the Golden Mile deposit hosted in Golden Mile diorite is a typical example, whose mineralization mainly occurs in the sericite-pyrite alteration zone; the quartz vein stockwork type is typically exemplified by the Mount Charlotte deposit hosted in Golden Mile diorite, whose mineralization mainly occurs in the carbonate-pyrite alteration zone in the periphery of the silicic zone; the laminated quartz vein type is of stratabound characteristics with well developed chloritization. Based on geology and mineralization characteristics of the gold concentration areas and ore deposits, the authors hold that the Norseman-Wiluna gold metallogenic belt contains extensive hydrothermal alteration and its gold mineraliza- tion is mainly hosted in Fe-sulfide or arsenopyrite, with Archean greenstone belt, BIF, deep fracture and fold being essential to the distribution of gold deposits. The indicators for exploration are summarized in this paper, and some suggestions for exploration are al- so put forward.