勘查地球化学数据处理,分析和综合研究,在找矿靶区圈定、成矿规律研究以及矿产资源潜力的定性、定量预测中发挥重要的作用。数据处理过程中的关键问题是地球化学背景的正确确定。传统方法基于统一的背景值,适用于地质背景相对单一的地区。而地球化学勘查区域多数比较复杂,可能出现多种岩石类型。水系沉积物是上游汇水域内岩石及其风化产物经剥蚀、搬运和迁移而形成的,由于受到复杂岩性的影响,往往表现出多个成分母体的特点(焦保全等,2009)。传统方法忽略了岩性的影响,可能会把高背景值区 Exploration geochemical data processing, analysis and comprehensive research, in the prospecting target delineation, metallogenic regularity and qualitative and quantitative prediction of mineral resources play an important role. The key issue in data processing is the correct identification of the geochemical background. The traditional method is based on a uniform background value and is suitable for a relatively single area with a geological background. The geochemical exploration area most of the more complex, there may be a variety of rock types. Water sediments are formed by denudation, transport and migration of rocks and their weathered products in the upper catchment waters. Due to the complex lithology, they often exhibit the characteristics of multiple parent materials (Jiao et al. 2009). The traditional method ignores the influence of lithology and may put a high background value area