Delineation of Sedimentary Metamorphic Rich Iron Ore Bodies Based on Geophysical Techniques:Case Analysis of Qidashan Iron Ore in Anshan,Liaoning
Anshan-Benxi Area of Liaoning Province is one of the most important iron resource bases in Northern China.There are various iron-rich orebodies distributed in this area.The studies on the iron-rich ore metalloge-ny are fruitful for the past decades but the prospecting technology for iron-rich ores is relatively lacking.Based on the discrepancy of physical parameters between the iron-poor and-rich orebodies,we selected surface high-precision magnetic and high-density resistivity methods to perform the comprehensive geophysical exploration of the iron-rich orebodies in the Qidashan iron mine area in Anshan,Liaoning Province.The study results show that the high-precision magnetic method is able to delineate the spatial distribution range of the magnetic anoma-lies caused by the enriched iron bodies in the magnetic anomaly field with a poor iron grade through limiting the magnetic field intensity at＞16,000 nT.The high-density resistivity method can accurately characterize the shape and scale of iron-rich bodies in the high magnetic anomaly field by limiting the resistivity at＜2200 Ω·m.This can be considered as a constraint threshold to build a forward and inverse models for the ground magnetic method as to identify and locate the iron-rich bodies in iron-poor ore layers.We also found that the intersection area of the NNW strike and NEE lateral fault in Qidashan iron mine area has a higher potential to form thick and enriched iron orebodies.
Anshan-Benxi Areairon-rich minehigh-precision magnetic methodhigh-density resistivity methodore identification and location
万方数据
维普
