摘要
根据以往的经验,在找矿勘查中,通常应用高精度磁法和电法,很少应用重力方法.本文通过小面积的大比例尺高精度重力工作,展示了重力工作在找矿勘查中所起的作用.尤其是在高纬度覆盖区,地表地质不甚明了、电法工作比较困难的情况下,可以发挥重力工作受环境干扰小的优势,寻找高密度地质体.在本矿区中,重力工作作为高精度磁测工作的重要补充,有利于更准确地确定矿体的位置和平面形态特征.由于高精度磁测方法寻找的是有磁性矿物,当矿体无磁性时,磁异常不能反映矿体的位置和形态.本文根据重力方法和磁测方法的原理,对矿区的地球物理场进行研究,给出本矿区识别矿体异常的原则,根据磁性矿物与铅锌矿伴生的特点,结合磁异常,如果重磁异常中心吻合较好,重磁异常幅值和梯度也较大,表明矿体异常的可靠性很大;当然,对磁异常表现为负磁异常的高频重力高异常也不能忽视,有可能是埋藏浅的无磁性金属矿的反映.所以,需要密切关注幅值大、梯度大的高频重力高异常.
Based on past experience, in the exploration of ore prospecting,normally, we used high accuracy magnetic and electrical method, gavity is rarely used. this paper shows the role of gravity metod in prospecting exploration with small area of large-scale high accuracy gravity work. Espacially in the higher latitudes coverage area,the surface geological uncertain, electrical method is relatively difficult , play the advantage of the small environmental impact to find high density geological body. In this mine, gravity is the important added of high accuracy magnetic metond to more accurately determine in underground orebody characteristics, when the ore body without magnetic, magnetic anomaly can＇t reflect the position of the ore bodies and form. This paper according to the principle of gravity and magnetic measurement method, studied the earth＇ s physical field of the mining area, and gives the principle to recognize the abnormal of ore body. If the magnetic anomaly center and gravity anomaly center is consistent, amplitude and gradient of anomaly is bigger, show that may be the reflection of the ore body of course, themagnetic anomaly performance for negative magnetic anomaly , and high frequency gravity high abnormal also cannot ignore, may be the reflection of shallow buried without magnetic metal. So, need to pay close attention to amplitude, high frequency of gravity gradient big high abnormalities.
出处
《地球物理学进展》
CSCD
北大核心
2013年第3期1472-1482,共11页
Progress in Geophysics
基金
国家重大仪器专项(2011YQ05006011)
国家地质矿产调查评价项目(1212010050235)联合资助
关键词
重力方法
磁法
大比例尺
高精度
grvity method, magnetic method, large-scale, high accuracy
