地质体方法圈定化探异常——以张家口某地区为例

Geochemical anomalies lineation by means of geological bodies——Taking an area in Zhangjiakou as an example

如何确定元素异常下限是化探工作的关键问题。由于元素在不同的地质体内具有不同的分布形式和背景含量,因此在地质情况较复杂地区采取统一值作为元素异常下限值存在一定缺陷。文章以张家口某地区1?20万水系沉积物数据为例,在分析不同地质体内元素分布规律的基础上,确定了不同地质体内元素异常区域,研究表明该方法可有效弥补全区采用统一值圈定异常所造成的不足。

Determination of lower limits of the element anomalies are the key problem in geochemical exploration.Because distribution patterns and background values of elements in different geological bodies are quite different it is not proper to adopt a identical value in an area with compliex geology.As an example of the river sedement geochemical data at scale 1：200000 for an area in Zhangkou of Hebei province the authors lineated elements anomalies for different geological bodies on basis of analyzing the element distribution law.The result is better than that of adopting an identical value.