岩石地球化学异常下限的确定方法对比——以云南思姑锡矿区为例

Comparison of low limit determination methods of petro-geochemical anomly—Taking Sigu area of Yunnan as an example

文章以云南思姑锡矿区周边岩石的X荧光化探样品中的Sn元素为研究对象,分别采用传统统计法、勘查数据分析法和多重分形法确定异常下限,并对各方法在研究区的使用效果进行了对比。勘查数据分析法圈定的异常比已知矿床、矿化带范围小,异常较为分散;传统统计法圈定的异常与已知矿床、矿化带范围基本吻合,且较为连续,但漏掉很多弱小异常;多重分形法圈定的异常与已知矿床、矿化带范围几乎完全吻合,异常连续性好,没有漏掉弱小异常,并圈定出一些未知的异常区域,为下一步矿区外围找矿工作提供了重要参考。

The article takes the Sn analysis of X-ray fluorescence of geochemical exploration in Sigu area of Yunnan as an example. Results of the traditional statistical method, EDA method and multi-fractal ap- proach are compared. Anomlies outlined with EDA method are smaller and more discontinuous and scat- tered than the known ore deposit and mineralization; Anomlies outlined with the traditional statistical method basically coincided with the known ore deposit and mineralization and more continuously but some weak and small anomlies disappeared; Anomlies outlined with multi-fractal approach basically coincided with the known ore deposit and mineralization and more continuously with appearance of unknown anom- lies and without disappearance of the weak and small anomlies thus providing more possible targets for further prospecting.