东平——汶上铁成矿带西侧低缓磁异常区找矿前景分析

Analysis on Ore Prospecting Prospective in Low Magnetic Anomaly Area in the West of DongpingWenshang Iron Metallogenic Belt

摘要:

梁山东丁庄铁矿位于东平汶上铁成矿带西侧的低缓磁异常区，为区内新发现的沉积变质型铁矿床。通过1∶1万高精度磁法面积测量工作，在区内圈定3个磁异常，并进行钻探验证，证实其中2个为隐伏磁铁矿体引起，矿体赋存于泰山岩群山草峪组中。通过研究矿体的地质特征、磁异常特征，并与区域铁矿成矿条件对比分析，认为区内矿致磁异常特征一般表现为在数十纳特的平缓背景场基础上，突然升高至数百纳特的相对高值异常，具突变特征。该类异常一般呈NW走向，与东平汶上铁成矿带走向基本一致，其形态一般呈规则的长条带状、椭圆状或串珠状。区域上存在较多与研究区具有相似特征的低缓磁异常，且具备有利的成矿地层条件，因此认为区域上低缓磁异常区具有较大的找矿潜力，找矿前景良好。

Abstract:

Dongdingzhuang iron deposit is located in low magnetic anomaly area in the west of DongpingWenshang iron metallogenic belt. It is a newly discovered sedimentary metamorphic iron deposit in the area. Through high precision magnetic measurement with the scale of 1∶10000, three magnetic anomalies have been circled. By drilling verification, it is confirmed that two of them are caused by concealed magnetite bodies, and the ore bodies occur in Shancaoyu formation of Taishan group. Based on the study of geological characteristics of ore bodies and the characteristics of magnetic anomalies, and comparative analysis with the metallogenic conditions of regional iron deposits, it is concluded that the characteristics of the oreinduced magnetic anomalies in the area are generally relatively highvalue anomalies rising suddenly to hundreds of nates on the basis of gentle background field of tens of nates, with the characteristics of mutation. This kind of anomaly is generally NW trending, and is basically consistent with the trend of Dongping Wenshang iron metallogenic belt. Its shape is generally regular strip, ellipse or beaded. it is concluded that there are many low and slow magnetic anomalies with similar characteristics as those in the study area with favorable metallogenic stratigraphic conditions. Therefore, it is considered that there is a high prospecting potential and a good prospecting prospect in the area.