基于S-A多重分形滤波方法的深层土壤Au元素异常识别—以皖东张八岭—管店地区为例

张八岭—管店地区位于皖东张八岭构造带北部,区内已发现多处金多金属矿点,但尚未取得显著突破。近年来,多维分形理论与地球化学勘查相结合的方法已被广泛应用于Au、Cu矿床的找矿勘查工作,其中S-A(能谱密度-累计面积)方法是一种建立在能谱空间上的分形滤波技术,能够利用傅里叶变换对物化探数据进行异常和背景分解。以张八岭—管店地区深部土壤Au元素为例,利用S-A方法对研究区深部土壤中Au元素地球化学场进行异常识别。结果显示,该方法能够有效分离地球化学背景,识别已知金铜矿点的矿致异常信息,在区内已知矿点以外识别出多个Au元素异常区域。研究成果可为进一步找矿勘探提供新的目标和方向。

Identification of Au anomaly in deep soil with S-A multifractal filtering method: A case study in Zhangbaling-Guandian area, eastern Anhui Province

Located in the north of Zhangbaling tectonic belt, the Zhangbaling-Guandian area is the one of the most important Au prospective areas of eastern Anhui Province. Several Au deposits have already been discovered, but the lack of significant breakthrough calls for further prospecting. Recently, the multifractal theory together with geochemical exploration has been widely used in exploration of Au and Cu deposit. As a multifractal filtering technology based on power spectrum space, S-A method can be used to separate the anomaly from background of geophysical and geochemical data using Fourier transform. Taking Au in deep soil in the Zhangbaling-Guandian area as an example, this paper identifies its geochemical anomaly using S-A method. The results show that S-A method can effectively separate the anomalies from geochemical background, identify the anomalies caused by Au and Cu mineralization. Meanwhile, several Au anomalous areas have been newly identified, providing a new direction and target for further exploration.