流体成矿地球化学界面是成矿环境条件变化、流体性质演化、流体—环境作用的突变部位,这些部位往往是流体成矿定位的重要场所。在巴西金矿田,应用X射线荧光测量方法可以探测流体成矿过程中元素在浅地表的地球化学异常及蚀变分带,识别流体成矿定位地球化学界面在浅地表的位置及分布特征;地气测量方法可以查明深部的地球化学异常和断裂破碎带的位置及特征,确定深部地球化学界面的分布。 Fluid metallogenic geochemical interface is a sudden change of metallogenic environmental conditions, evolution of fluid properties and fluid-environment interaction, and these sites are often the important places for fluid metallogenic localization. In the goldfield in Brazil, the geochemical anomalies and alteration zoning of elements in the shallow mineralization process can be detected by X-ray fluorescence spectrometry, and the location and distribution of fluid-bearing geochemistry interface in the shallow surface can be identified. Geogas measurements can identify deep geochemical anomalies and the location and characteristics of the fault zone, and determine the distribution of deep geochemical interfaces.