山东省东平-汶上铁矿带西侧低缓磁异常区铁矿初步验证及意义——以李官屯隐伏低缓磁异常铁矿为例

Preliminary Verification and Significance of Iron Deposit in the Low Magnetic Anomaly Area in Dongping-Wenshang Area in Shandong Province——Taking Liguantun Low and Slow Magnetic Iron Deposit as an Example

研究区位于鲁西地区重要的东平—汶上铁矿带西侧,为低缓磁异常区。通过高磁测量、井中三分量磁测、钻探验证等手段,在梁山李官屯附近低缓磁异常区发现铁矿一处,矿床类型为条带状铁建造(BIF)型铁矿。该区下伏地层主要为新太古代泰山岩群山草峪组,岩性为黑云变粒岩,局部夹磁铁石英岩、磁铁角闪石英岩,矿石的主要组成矿物为磁铁矿、黄铁矿、黄铜矿。研究区山草峪组大面积分布,根据成矿时代、赋矿层位、含铁建造及岩石组合,结合成矿规律研究分析,梁山地区的大面积条带状分布的低缓磁异常区是寻找隐伏铁矿体的有利部位。

The study area is located at the west of Dongping-Wenshang iron ore belt in western Shandong province.It is low magnetic anomaly area.By means of high magnetic measurement,Inaka Mi component magnetic measurement and drilling verification,one iron deposit has been found in low magnetic anomaly area.It is a banded iron formation(BIF)type iron deposit.The underlying strata in this area are mainly Shancaoyu formation in new Archean Taishan rock group.The lithology is biotite granulite,accompanying with magnetite quartzite and magnetite hornblende quartzite.Major mineral compositions are magnetite,pyrite and chalcopyrite.Shancaoyu formation is widely distributed in the study area.According to metallogenic epoch,ore bearing horizon,iron bearing formation and rock assemblage,combining with metallogenic regularity,the low and slow magnetic anomaly area with banded type distributed widely in Liangshan area is suitalbe location for searching for hideen iron ore bodies.