山东枣庄杨家堡子铁矿床地质特征及成因探讨

Geological Characteristics and Its Origin of Yangjiabuzi Iron Deposits in Zaozhuang City of Shandong Province

杨家堡子铁矿位于山东省枣庄市峄城区峨山镇,隶属苍峄铁成矿带,矿体赋存于新太古代泰山岩群山草峪组上部的变质岩中。该矿床内圈定磁铁矿体11个,求得铁矿石(333)资源量3 378.2万t,矿床平均品位TFe 33.30%,mFe 22.64%。主矿体为Ⅲ-6矿体,占矿床总资源量的83.69%,其长度1 137 m,最大斜深1 065 m,埋深707~1 369m,形态复杂程度中等,品位变化属均匀类型。含矿岩石为磁铁石英角闪岩。矿石中的主要有用组分为Fe,伴生元素含量较低,均无综合回收利用价值,有害组分S、P的含量均较低,经选矿后可达到炼钢及炼铁要求。矿石结构主要有粒状变晶结构和柱状变晶结构;矿石的构造主要为条带状构造,块状构造的矿石较少,但品位相对较高。矿石自然类型为原生磁铁矿石,工业类型属需选磁性铁矿石。该矿床成因与苍峄铁矿一脉相承,为典型的BIF型铁矿。根据区内以及邻区的见矿情况结合磁异常特征分析,杨家堡子矿区有良好的找矿前景。

Yangjiabuzi iron deposit locates in E＇shan town of Yicheng district in Zaozhuang city. It is subordinated to Cangyi iron metallogenic belts. The ore bodies occur in metamorphic rocks in the upper part of Shancaoyu formation in Neoarchean Taishan group. 11 magnetite ore bodies of this deposit have been circled. The amount of iron ore resources（ 333） obtained is 33782000 tons,the average grade of TFe is 33.30%,and the grade of mFe is 22.64%.The main orebody is Ⅲ-6 deposit,and accounts for 83.69% of the total amount of the mineral resources. Its length is 1137 m,the maximum oblique depth is 1065 m and the depth is 707 - 1369 m. The shape is complex,and the grade change is uniform. The ore-bearing rocks are quartz magnetite amphibolites. The main useful components in the ore bodies are Fe,the content of the associated elements is low,and there is no comprehensive recovery and utilization value. S and P are harmful components. Their contents are low,but can meet the requirement of steelmaking and ironmaking after beneficiation. The ore textures are mainly allotriomorphic granoblastic texture and nematoblastic texture,the structure is mainly banded type,and block structure is less,but the grade is relatively high.The natural type of ore bodies is primary magnetite ore. It is needed to choose magnetic iron ores for industry use.This kind of ore has the same genesis with Cangyi iron ore. They both are typical BIF iron ore. Yangjiabuzi iron deposit has good prospecting potential according to the amount of mineral resources in this area and adjacent areas with magnetic anomaly characteristics.