广西右江盆地金异常分布分形特征与成矿预测

Fractal analysis of Au anomaly separation and metallogenic prediction,Youjiang basin of Guangxi

在分析区域成矿地质背景的前提下,基于右江盆地广西境内Au水系沉积物数据,利用含量-面积模型(C-A)、分形滤波技术(S-A)与奇异性指数等分形方法,研究了Au元素富集规律和异常分布情况。C-A模型提取了大部分致矿异常,S-A模型和奇异性指数识别并增强了局部弱异常或隐伏异常,并刻画了区内北西向主构造。同时,根据异常提取结果,利用模糊证据权模型,对右江盆地内的金矿床进行了成矿预测,圈定了成矿潜力区。

Based on the analysis of geological setting and Au element stream sediments geochemical survey in the Youjiang basin of Guangxi,this paper use concentration-area（C-A）model,multifractal spectrum,spectrum-area（S-A）model and singularity index to analyze the enrichment of element and anomaly separation.The C-A model extracts most of the ore-induced anomalies.The S-A model and singularity index identify and enhance the local weak or hidden geochemical anomalies,and depict the NW structure.According to the abnormal extraction results,this paper make metallogenic prognosis and outline the prospects in the Youjiang basin using the fuzzy weights of evidence model.