摘要
地球化学异常下限的确定对圈定成矿有利靶区及指导找矿非常关键。本文以青海省锡铁山地区水系沉积物测量中As、Cr、Ni、Sn、Th等5个元素为例,分别运用剔除法、EDA法、迭代法对数据进行处理,确定异常下限,圈定异常。通过三种方法圈定异常结果对比发现,剔除法和EDA法确定的异常下限值偏高,不能够有效的圈出成矿有利靶区,而迭代法确定的异常下限,圈出了很多弱异常,与客观实际相符,故迭代法是适合本区比较合理的方法。
Determination of lower limit of geochemical anomaly is very important to delimitation of favorable mineral exploration targets and guiding the survey. With survey of 5 elements of As, Cr, Ni, Sn and Th in stream sediments in the Xitieshan area, Qinghai Province as example, this paper applied scalping method, EDA method and iterative method to data processing respectively to determine anomalous lower limit. By comparison, scalping method and EDA method gave a bit higher lower limit, incapable of effectively delimiting favorable mineralization targets, while iterative method-determined lower limit did not miss any significant weak anomalies. So, iterative method is reasonably applicable to this area.
出处
《安徽地质》
2013年第1期74-77,共4页
Geology of Anhui
关键词
地球化学
异常下限
剔除法
EDA法
迭代法
geochemistry
lower limit of anomaly
scalping method
EDA method
iterative method
