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

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。

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

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 approach are compared. Anomlies outlined with EDA method are smaller and more discontinuous and scattered 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 anomlies and without disappearance of the weak and small anomlies thus providing more possible targets for further prospecting.