摘要
旧县地区位于东平县城区西北部,东平湖的东北部。隐伏发育泰山岩群山草峪组黑云变粒岩、斜长角闪岩、条带状磁铁角闪石英岩等,是铁矿体的主要赋矿层位。发育2条NNW向断裂构造,岩浆岩仅分布有新太古代傲徕山序列条花峪单元和中生代沂南序列铜汉庄单元。研究区位于汶上-东平-阿城NW向区域航磁测带的北段,磁场等值线分布比较均匀,规律性较好,以东、北、西侧为低背景,中、南部相对较高,圈定1处走向NW—SE近椭圆形异常,发现2个铁矿体。矿体呈层状赋存于新太古代泰山岩群山草峪组中下部,为沉积变质型铁矿,赋矿岩石为条带状磁铁石英岩、角闪磁铁石英岩。
Jiuxian area is located in the northwest of Dongping county and the northeast of Dongping Lake.There are concealed development of biotite granulite,plagioclastic amphibolite and banded magnetite amphibolite of Shancaoyu formation in Taishan group.They are orebearing layers of iron ore bodies.There are two fault structures with the trend of NNW,and the magmatic rocks are only distributed in Tiaohuayu unit in Neoarchean Aolaishan sequence and Tonghanzhuang unit in Mesozoic Yinan sequence.Jiuxian area is located in the north section of WenshangDongpingAcheng regional aeromagnetic survey belt with the trend of NW.The magnetic field contours in this area are relatively uniformly distributed with good regularity.The east,north,and west sides are low backgrounds,while the south part is relatively high.An elliptical anomaly with the trend of NW—SE has been circled,and two iron ore bodies have been circled as well.The ore bodies occur in layers in the middle and lower parts of Shancaoyu formation in Neoarchean Taishan group.They are sedimentary metamorphic iron deposits.The orehosting rocks are banded magnetite amphibolite and amphibolite magnetite quartzite.The long axis of the magnetic anomaly in the region is about 1200m,the short axis is about 640m,and the peak value of the anomaly is 800nT.The intensity and scale are relatively large,and the magnetic anomaly in the region is a mineralinduced anomaly.
作者
李宗成
刘彦
田晓明
于本秀
王莉
曲守全
张念朋
程凤
LI Zongcheng;LIU Yan;TIAN Xiaoming;YU Benxiu;WANG Li;QU Shouquan;ZHANG Nianpeng;CHENG Feng(No.5 Exploration Institute of Geology and Mineral Resources, Shandong Tai'an 271000, China;Pingyi Bureau of Natural Resources and Planning, Shandong Pingyi 273300, China)
出处
《山东国土资源》
2021年第11期15-22,共8页
Shandong Land and Resources
基金
山东省国土资源厅财政“山东省东平县旧县地区铁矿普查”(鲁国土资字〔2015〕310号文)。
关键词
铁矿床特征
沉积变质型
找矿前景
旧县地区
东平
Characteristics of iron deposit
prospecting prospect
Jiuxian area
Dongping county
