【作者】 付治国； 李战明； 马红义； 王鵾； 班宜红； 刘建军； 吴飞；

【Author】 Fu Zhiguo,Li Zhanming,Ma Hongyi,Wang Kun,Ban Yihong,Liu Jianjun,Wu Fei (No.IGeoexploration Party of Henan Provincial Bureau of Geo -exploration and Mineral Development, Xuchang 461000,China;)

【机构】 河南省地质矿产勘查开发局第二地质勘查院；

【摘要】 河南许昌铁矿田含矿岩系的赋矿地层为晚太古界登封群,其在嵩山区和许昌区均为登封群,而在鲁山区和舞阳区则为太华群,在济源区为林山群,总之在较大区域内可对比。登封群自下而上分为草庙张组（Ar₂c）、武庄组（Ar₂w）、花杨组（Ar₂h）。其中武庄组是铁矿的含矿岩系（含铁岩系）。武庄组又分为下、上两段,下段（Ar₂w¹）不含矿,主要岩性为角闪斜长片麻岩、黑云斜长变粒岩及角闪斜长片岩等;上段（Ar₂w²）主要含两层矿,下矿带1-3层角闪石英岩型贫磁铁矿,上矿带含1-2层角闪石英岩型贫磁铁矿。从武庄组上段含矿岩系整体岩性上看,以变粒岩类为主,为中深变质岩系。这是一套以拉斑玄武岩、中酸性火山岩夹少量基性火山岩以及与沉积岩的原岩组合,代表以基性火山熔岩强烈活动为主的间歇性喷发沉积环境,揭示了太古代地球上地幔浅部向形成地壳变迁的过渡性演变历史。更多还原

【Abstract】 In Xuchang iron ore field of Henan Province,the ore - bearing strata are late Archean Dengfeng group,both are Dengfeng group in Songshan area and Xuchang area,while Taihua Croup in Lu Mountain and Wuyang area,and Linshan Group in Jiyuan District In a word,it can be compared in a larger area.The Dengfeng group is divided into Caomiaozhang formation（Ar2 c ） and Wu zhuang formation（Ar₂ w ）, Huayang formation（Ar₂h ） from bottom to top.Among them,Wu zhuang formation is the ore - bearing rock series of the iron mine.Wu zhuang formation is divided into lower and upper sections,the lower（Ar₂w₂） section contains no ore,the rocks are mainly amphibolite plagioclase gneiss,biotite plagioclase,amphibolite etc;the upper section mainly contains two layers ore,lower one contains 1-3 layers of hornblende quartz rock type lean magnetite,upper one contains 1-2 layers of the hornblende quartz rock type lean magnetite ore.From the overall lithology ofthe ore - bearing rock series in the upper part of Wu zhuang formation,the most is granulite,pertain to medium and high metamorphic series.It’s a set of protolith association based on tholeiite,acidic volcano rock intercalated with a minor amount of basic volcanics and sedimentary rocks, which is on behalf of intermittent eruptive depositional environment mainly based on basic volcano lava strong activity,revealing the transitional evolution history from Archean earth mantle shallow part to earth crust formation.更多还原