高精度磁测在陕西省秋树坪地区金矿勘查中的应用

The Application of High-precision Magnetic Prospecting to Gold Mine Exploration in Qiushuping Area of Shaanxi

高精度磁法测量能够准确地反映与金成矿相关的目标物的磁性变化,认识隐伏的控矿岩体、含矿蚀变破碎带和构造的分布,可以达到间接寻找金矿的目的。通过在秋树坪地区某金矿普查区进行了地面高精度磁测法扫面测量,根据磁法测量结果圈定了中粒、细粒、中细粒角闪辉长岩的岩性接触带,掌握了控矿岩体的分布范围,在矿化带上方表现为正值磁测异常区为主以及正值磁测异常区与负值磁测异常区的接触带,进而缩小了找矿靶区。最终在圈定的重点综合异常区范围内,找到了达到工业品位的金矿石,表明了该方法在金矿勘查中发挥了有效的作用。

The method of high-precision magnetic prospecting can reflect accurately the magnetic change of target body related to the gold mine.The distribution of rock bodies,structures and alteration crush belts,is helpful to find gold deposit indirectly.The accuratecy magnetic prospecting on earth surface was used in the gold exploration in Qiushuping area of Shaanxi province,and based on the results of magnetic survey,the lithologic contact boundary of medium grain,fine grain and medium-fine grained sediments is delineated and the ore controlling distribution is mastered.On the top of gold mine,the positive magnetic prospecting is as the main abnormal area and the contact boundary is between the abnormal areas of the positive magnetic prospecting and the negative magnetic prospecting,which is helpful to reduce the prospecting target area.Finally,in the delineation of themain comprehensive abnormal areas,the industrial grade of gold ore is found which shows the method is effective in the use of gold ore.