山东齐河地区航磁磁场特征与深覆盖区铁矿靶区预测

Aeromagnetic field feature and iron ore target prospecting in deep coverage area of Qihe in Shandong Province

通过开展1∶5万直升机航磁测量,进一步研究山东齐河深覆盖区侵入岩体与矽卡岩铁矿的赋存特征和分布规律。以高精度航磁资料为基础,结合地质和钻探成果,研究该区岩浆岩的航磁异常及断裂分布特征,编制了航空物探推断岩性构造图。通过研究深覆盖区不同规模及埋深磁铁矿石模型ΔT异常曲线特征、航磁ΔT异常对比结果及重点剖面L8040线航磁ΔT人机交互反演结果,获得了深覆盖区铁矿的航磁磁场特征,建立了矽卡岩铁矿的地质、地球物理找矿标志,预测了铁矿找矿远景区。共圈定了7个铁矿找矿远景区和8个铁矿找矿靶区,预测铁矿资源量达1.5亿t。该成果对山东齐河地区基础地质研究和深覆盖区铁矿靶区预测具有重要参考价值。

Through the 1∶50000 helicopter aeromagnetic survey,the authors investigated the saving status and distribution characteristics of intrusive rock and skarn iron ore in deep coverage area of Qihe in Shandong Province.Based on the high precision aeromagnetic data and the geology and drill hole data,the authors studied the aeromagnetic anomaly and the fracture distribution character of magmatic rock in this area,and compiled the stratigraphic structure deduced from aeromagnetic data in Qihe of Shandong Province.According to the study of magnetic iron oreΔT abnormal curve characteristics for different scale and burial depth in deep coverage area,aeromagnetic ΔT abnormality comparison result and the human-computer interactive inversion of aeromagnetic ΔT in important section L8040,the aeromagnetic field characters in deep coverage area were acquired and the geological and geophysical ore prospecting marks were built.Besides,the ore-forming favorable areas were also predicted.Seven iron ore prospecting areas and eight iron ore prospecting targets were determined and the amount of iron ore resources was predicted to be 150 million tons.This research has reference significance for basic geological research and deep coverage iron ore prospecting in Qihe of Shandong Province.