济宁市汶上泰山岩群张楼铁矿床特征及成因探讨

鲁西地区济宁汶上张楼铁矿床位于著名的汶上东平成矿带,广泛发育前寒武纪条带状铁建造( BIF),赋矿层位为泰山岩群山草峪组,岩性以黑云变粒岩为主,次为黑云角闪片岩,黑云斜长片麻岩、片岩,条带、条纹状磁铁石英岩,BIF与其形成均为新太古代晚期。矿床由4条矿带22个矿体组成,呈层状、似层状、透镜状产出,矿石的矿石矿物主要为磁铁矿,其次为少量的赤铁矿、褐铁矿、黄铁矿等,常见矿石的结构主要为粒状变晶结构,次为鳞片粒状变晶结构。类型归属海相火山沉积变质铁矿床类型中的变质铁硅建造铁矿,即鞍山式铁矿。

Study on Characteristics and Origin of Zhanglou Iron Deposit in Taishan Group in Wenshang County of Jining City

Zhanglou iron deposit in Wenshang county of Jining city in Luxi area locates in famous Wenshang-Dongping metallogenic belt. Precambrian banded iron formation (BIF) developed well in this area. Ore bearing strata are Shancaoyu formation of Taishan group. The lithology is mainly composed of biotite granulite, and accompanied with biotite hornblende schist, biotite plagioclase gneiss, schist, strip and stripe like magnetite quartzite. BIF and its forming age are Neoarchean era. The deposit is composed of 4 ore belt and 22 ore bodies, and outcropped as layered, stratoid, lenticular type. Ores are mainly magnetite, and a small amount of hematite, limonite and pyrite. The structures of common ores are mainly granoblastic texture, and accompanied with granoblastic texture. It is marine-volcano sedimentary metamorphic iron silicon type deposit, that is Anshan type iron deposit.