| 刘明军,许宗宪,于昌明.基于高精度磁测的鞍山齐大山铁矿深部找矿潜力分析[J].地质找矿论丛,2018,33(3):458-465 |
| 基于高精度磁测的鞍山齐大山铁矿深部找矿潜力分析 |
| The high precision survey data-based analysis of prospecting potential to depth of Qidashan iron mine, Anshan-Benxi area, Liaoning Province |
| 投稿时间：2018-04-02 修订日期：2018-07-10 |
| DOI：10.6053/j.issn.1001-1412.2018.03.017 |
| 中文关键词: 高精度磁测 磁法解译 找矿预测 齐大山铁矿 辽宁省 |
| 英文关键词:high-accuracy ground magnetic survey magnetic interpretation ore prediction Qidashan iron deposit Liaoning province |
| 基金项目:国家自然科学基金项目（编号：41672078）资助。 |
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| 中文摘要: |
| 鞍山齐大山矿集区存在2条明显的磁异常带：一条为齐大山露天开采铁矿引起的异常带，另一条为齐大山铁矿西侧的陈台沟深部隐伏铁矿体引起的磁异常带，结合铁矿区地质特征和岩（矿）石物性特征，对矿区地面高精度磁测数据开展综合研究。8个不同高度上延断面磁异常等值线图显示，磁异常形态具上窄下宽特征，总体形态未发生大的改变，上延3 000 m的异常强度仍然超过5 000 nT；磁法数据的小波分析表明，在四阶细节等值线图中的2条磁异常带合二为一，而五阶逼近值线图反映的磁源体深度为2 647 m，推测其下为区域背景场特征；对3760剖面线开展的2D/2.5D人机对话式的拟合反演和3D正演研究的结果均表明，西侧的陈台沟隐伏铁矿与东侧的齐大山铁矿在-3 000 m以上呈向形形态连接，推测2个铁矿体的深部连接部分存在厚大的磁铁贫矿体或富铁矿体，预测矿区深部仍然存在铁矿资源找矿潜力。 |
| 英文摘要: |
| There are two obvious magnetic anomly belts in Qidashan iron deposit-clustered area. One of the two is caused by the open-pit mined Qidashan iron deposit and the other by deeply buried Chentaigou iron deposit. Combined with geological characteristics of mining area and physical property of the ores and rocks this paper carries out a comprehensive study on the ground high precision magnetic survey data. The anomly contour of a section with upward continuation from 8 elevations shows that the anomly is generally wide at top and narrow at bottom without such morphological change. Upward continuation of 3000m the magnetic anomly is still 5000 nT. Small wave analysis of magnetic data shows that in 4 step detail contour the two anomlies are merged and in the 5 step approaching value line drawing the magnetic source mass is buried to depth of 2647m under which is the deduced background feature. Both of the 2D/2.5D human-computer interactive inversion and 3D forward modeling study all show that the Chentaigou iron deposit in the west and Qidashan iron deposit in the east are integrated in a synform above -3000m thus a prediction is made that huge and thick poor magnetic iron ore body or rich ore body occurs at the integration part of the iron ore deposit and it is potential for prospecting to depth. |
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