甘肃武都地区1:5万水系沉积物地球化学数据信息处理

Information processing of 1∶50000 stream sediment geochemical data in Wudu area,Gansu Province

化探背景与异常的划分即异常下限的确定是矿产勘查中勘查地球化学重要的组成部分。本文以武都地区1∶5万水系沉积物测量数据为研究对象,主要研究主成矿元素Au通过传统数据处理方法、EDA箱图法、分形法确定异常下限,圈定异常。结合研究区内的地质特征及已知矿点分布,EDA箱图法更适合本区数据处理,能较好地识别区内异常,更好地指导区内矿产勘查工作。

The division of geochemical background and anomaly,i.e.the determination of anomaly threshold,is an important part in mineral geochemistry exploration.This paper took the 1∶50000 stream sediment survey data in Wudu area as the research object,mainly studied the main ore-forming element Au,and determined the anomaly threshold by the traditional data processing method,EDA box plot method,and fractal method.Considering the geological features and known ore distribution in the study area,the EDA box plot method was more suitable for the data processing in this area,which could better identify the anomalies in the area,and guide the mineral exploration work in the area.