摘要
澳大利亚坎宁顿银-铅-锌矿床是在艾萨山内围层东段发现的一个重要的富银布罗肯希尔型隐伏矿床,赋矿围岩与东段其他地层的关系还不清楚。艾萨山与成矿有关的地层时代为1677±9Ma,与布罗肯希尔铅-锌-银矿床的赋矿围岩时代一致,后期构造将坎宁顿矿床分为南北两矿区,南矿区是目前开发的重点。坎宁顿矿床南矿区包括5个主要的经济矿脉层和9种矿化类型。主要的硫化物是方铅矿和闪锌矿,其世代和共生关系复杂。坎宁顿矿床的所有矿化类型都极度富银,主要以含银方铅矿与银黝铜矿包裹体的形式产出。某些矿化类型Sb、Cd、As、Cu和F浓度高。全面投产以后,坎宁顿将成为世界上最大的银生产商之一。介绍了Walters等提出的一个高温交代已有富Fe-Ca-Mn-Pb-Zn-Ag含矿体系的成矿模型图。
The Cannington Ag-Pb-Zn deposit represents an important discovery of Ag-rich Broken Hill-type mineralization in the eastern segment of the Mount Isa inlier. Lithostratigraphic correlations of the host lithologies with other units in the eastern segment are unclear. Limited dating of probable stratigraphic equivalents has given an age of 1677±9Ma, which is basically coeval with host depositional ages for Pb-Zn-Ag mineralization at Mount Isa and Broken Hill. The orebodies are divided on the basis of late structural displacement of the zone into Northern and Southern zones. The Southern zone is the focus of current development, and its mineralization occurs as crudely stratabound massive sulfide lenses that display complex brittle and ductile disruption. Mineralization within the Cannington Southern zone is divided into five main economic lode horizons that comprise nine mineralization types. Dominant sulfides are galena and sphalerite, which show multiple generations and variable intergrowths. Extreme Ag enrichment is a consistent association of all mineralization types in the Cannington deposit, and is mainly related to argentiferous galena with freibergite inclusions. High levels of Sb, Cd, As, Cu, and F are also a feature of specific mineralization types. When in full production, Cannington will be one of the world＇s largest Ag producers. A genetic model is proposed that involves high-temperature metasomatic zone refining of a preexisting Fe-Ca-Mn-Pb-Zn-Ag-rich mineralized system.
出处
《地质通报》
CAS
CSCD
北大核心
2015年第6期1077-1085,共9页
Geological Bulletin of China
基金
中国地质调查局项目(编号:12120115065901
12120115068701
1212011120326)
作者简介
刘春花（1985-），女，博士，从事岩石学和矿床学研究。E-mail：chunhua91052@126．com
通讯作者：聂凤军（1956-），男，研究员，博士生导师，从事金属矿床和地球化学研究。E—marl：nfjj@mx．cei．gov．cn
