山东省兰陵县小闫庄铁矿床地质特征及找矿方向

Geological Characteristics and Prospecting Direction of Xiaoyanzhuang Iron Deposit in Lanling County in Shandong Province

小闫庄铁矿位于鲁西苍峄铁矿带中部,属"鞍山式"沉积变质型铁矿床,矿体隐伏于地下90~403m,赋存于新太古代泰山岩群山草峪组地层中。矿床由2个矿体组成,矿体呈鞍状、似层状近平行产出,矿体的展布受石闫背斜控制,走向NW,倾向S或N,倾角33°~52°。含矿岩石为磁铁角闪石英岩及磁铁石英角闪岩,黑云变粒岩与黑云角闪片岩为矿体顶底板围岩,矿石工业类型为需选弱磁性贫铁矿石。在阐述小闫庄铁矿床地质特征基础上,总结出铁矿找矿标志,建立了预测找矿模型,探讨了矿床成因,为区域内寻找同类型铁矿具有一定借鉴意义。

Xiaoyanzhuang iron deposit is located in the central of Cangyi iron ore belt in Luxi area.It belongs to"Anshan type"sedimentary metamorphic iron deposit.Ore bodies buried in the depth of 90~403m.It occurred in Shancaoyu formation i Neo-Archean Taishan group.The iron deposit is composed of two ore bodies,and the ore bodies is saddle-shaped and appears to be nearly parallel to the strata.The distribution of the ore body is controlled by Shiyan anticline with the trend of NW.The inclination is S and N,the dip angle is 33°~52°.The ore-bearing rock are magnetite hornblende quartzite and magnetite quartz amphibolite,and the biotite granule and the biotite amphibole schist are the surrounding rock of roof and floor of ore body.The ore industry type is weakly magnetic poor iron ore which should be chosen.Based on the study of geological characteristics,prospecting indicators of Xiaoyanzhuang iron deposit have been summarized,the metallogenic model has been established,and the origin of the deposit has been studied.It will provide some reference for searching for the same type of iron ore in this area.