在外来物覆盖区,特别是外来黄土覆盖的西北地区,开展化探次生晕找矿工作,如果只按照正规的测网进行取样,往往因采不到由基岩风化所形成的B、C层残坡积物,而得不到较好效果。为了能使化探工作在这类地区起到应有作用,我们进行了次生晕随机取样方法试验,获得较好成果。 In the area covered by alien materials, especially in the northwestern area covered by alien loess, exploration for secondary faint halogenic gas exploration is carried out. If sampling is carried out only according to the formal network, it is often impossible to obtain the B and C formed by bedrock weathering Layer residual slope accumulation, but not good results. In order to make the geochemical exploration work in such areas play a role, we conducted a random sampling of secondary halo test, get better results.