单县龙王庙铁矿地质地球物理特征及找矿意义

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鲁西南地区发育有沉积变质型铁矿,且与航磁异常密切相关.龙王庙航磁异常位于山东省单县东南部地区,该异常具有寻找隐伏铁矿的潜力.为了进一步查明该异常区的异常源属性和铁矿地质特征,对以往地质、物探等资料进行了综合研究,并投入了大比例尺重磁测量等物探工作;通过优选区内成矿有利部位的基础上,利用钻探施工进行异常查证.区内物探测量工作将龙王庙航磁异常区进一步分解为大刘庄异常和龙王庙西南异常2个次级异常.龙王庙西南异常和大刘庄异常的重磁特征较为相似,总体呈现NW-SE向.与大刘庄异常区相比,龙王庙异常区的面积较大,且磁异常强度总体较高(磁测值约为420 nT).在综合分析该异常的基础上,在龙王庙西南异常选定了成矿有利部位,并施工了LZK01孔.在钻孔在—740.80~—1653.03 m标高处陆续揭露了12层铁矿体,累计厚度为58.37m矿体呈层状、似层状,矿石类型为条带状磁铁石英岩、磁铁透辉石英岩和磁铁角闪石英岩等.矿石平均品位为全铁—28.09%,磁性铁22.81%.龙王庙西南异常区的铁矿勘查工作表明,该异常是由隐伏铁矿体引起,铁矿类型与大刘庄铁矿床一致,均属沉积变质型铁矿.通过对区域重磁异常的对比分析认为,龙王庙西南异常的铁矿资源潜力巨大;此外,单县龙王庙地区的铁矿勘查工作也表明,磁法测量是区内的最重要的铁矿勘查手段,重力测量工作是区内的重要找矿手段之一. The depositional metamorphic iron ore is developed in the southwestern Shandong Province and closely related to the aeromagnetic anomaly.The Longwangmiao aeromagnetic anomaly is located in the southeastern part of Shanxian County of Shandong Province and has the potential of finding hidden iron ore.To further identify the anomaly And the geological characteristics of iron ore. The geology and geophysical data were comprehensively researched and geophysical work such as large-scale gravity and magnetic surveying was put into operation. Based on the favorable metallogenic parts in the area, drilling was carried out Anomaly verification.The geophysical survey in the area further decomposed the Longwangmiao aeromagnetic anomaly area into two sub-anomalies: the large Liuzhuang anomaly and the southwestern anomaly of the Dragon King Temple.The anomalous gravity and magnetic characteristics of the Southwest Longwangmiao and the large Liuzhuang are similar, Showing the NW-SE direction.Compared with the large Liuzhuang anomaly area, the anomaly area of ​​the Longwangmiao area is larger and the magnetic anomaly intensity is generally higher (magnetic measurement is about 420 nT) .Based on the comprehensive analysis of the anomaly area, In the southwest of Longwangmiao, the ore-forming favorable sites were selected and LZK01 holes were constructed.The 12-level iron ore bodies were exposed at the elevation of -740.80 ~ -1653.03 m with a cumulative thickness of 58.37m. ,like The ore types are banded magnetite, magnetite diopside quartzite and amphibole quartzite, etc. The average ore grade is -28.09% of the total iron and 22.81% of the magnetic iron ore.Exploration of iron ore in the anomaly area southwest of the Dragon King Temple It is indicated that this anomaly is caused by a concealed iron ore body and the type of iron ore is consistent with that of the Dazhuangzhuang iron ore deposit.According to the comparative analysis of the anomalies of heavy and magnetic anomalies in the area, In addition, the iron ore exploration work in the Longwangmiao area in Shanxian County also shows that magnetic measurement is the most important iron ore exploration method in the region. Gravimetric measurement is one of the important means of prospecting in the area.
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