低空航磁在浅覆盖区预测成矿靶区的勘查效果评价

Exploration Effect Evaluation of Low Altitude Aeromagnetic in Predicting Metallogenic Target Areas in Shallow Coverage Areas

我国黄土覆盖区面积广阔,黄土浅覆盖区岩(矿)石出露较少,地质及地球化学等地表勘查技术难以发挥作用,矿产资源勘查程度总体偏低,在黄土覆盖区如何快速、有效地圈定成矿有利区靶区,是目前存在的主要难题。本文主要介绍了在黄土浅覆盖区开展低空航磁测量,通过对取得的磁测ΔT做化极处理,结合实地调查划分了区内的主要断裂构造,进一步对化极后的ΔT做向上延拓处理,以及垂向二阶导数等处理,根据地表花岗岩体出露情况,结合地质及成矿理论,有效圈定了成矿靶区。通过地面查证、槽探揭露和钻探验证,在钻孔深度131.52 m、150.1 m、162.32 m处见得三层钨矿体,在146.24 m处见得一层铷矿体。并提交了小型矿产地一处,取得了较好的找矿效果,可为其他类似黄土覆盖区找矿提供参考。

In the context of China’s vast loess-covered areas,the rock(ore)in the shallow loess-covered area is far less exposed.The role geological and geochemical surface exploration techniques play is comparatively lacking,and the degree of mineral resources exploration is generally low.How to quickly and effectively delineate the target area of favorable metallogenic areas in the loess-covered area is the urgent problem we are facing.This paper mainly introduces the low altitude aeromagnetic survey carried out in the shallow loess coverage area.Through the polarization treatment of the obtained magnetic surveyΔT,this study classified the main fault structures in the area according to the field investigation,and conducted an upward continuation treatment with theΔT polarization and the vertical second derivative treatment.According to the exposure of the surface granite mass,combined with the geological and metallogenic theory,the metallogenic target area was effectively delineated.Through the ground inspection,channel exploration,drilling verification,three layers of tungsten ore bodies were detected at the depths of 131.52 meters,150.1 meters and 162.32 meters,and a layer of rubidium ore body was found at 146.24 meters.A small mining area has been submitted and a good prospecting effect has been achieved.