地球化学基线的确定方法研究--以攀枝花地区为例

地球化学基线指的是地球表层物质中化学元素浓度的自然变化，是区分自然的和人为的环境影响的重要参照。地球化学基线的确定方法和相关方法技术研究是目前国内外地球化学基线研究的重点和难点。作者采用标准化方法、相对累积频率方法、地层对比方法确定了攀枝花地区土壤的地球化学基线，结果表明，根据不同方法确定的地球化学基线值略有不同。应根据研究对泉、研究目标的不同并结合地质地球化学分析，选择合适的方法确定地球化学基线。

APPROACH OF DETERMINING GEOCHEMICAL BASELINES:A STUDY CASE FROM PANZHIHUA REGION

A geochemical baseline for an element refers to its variations in concentration in the surficial environment . A geochemical baseline can be used as a reference to monitor the change from some specific data without concern with whether the baseline determination is pure and natural or has been changed by human activity. Determining approach and relative techniques are the focal point and difficulty of the geochemical baseline study. This paper uses normalization procedure, relative cumulative frequency analysis and stratigraphic correlation to determine the geochemical baseline of the soil in the Panzhihua region . The results show that to use different methods can have different baseline values. The authors propose to select the methods of determining geochemical baseline according to the study object and geological background of study area.