基于分形理论的桂中盆地典型成矿元素地球化学异常提取

Fractal analysis on typical element anomaly separation in Guizhong basin

以桂中盆地Mn、Sn元素水系沉积物地球化学数据为研究对象,利用含量-面积模型(C-A)、能谱-面积模型(S-A)与奇异性指数等分形方法,研究了Mn、Sn元素富集规律和异常分布情况。其中,C-A模型提取了大部分矿致异常,S-A模型和奇异性指数识别了局部弱异常和高背景值下未叠加矿致异常的情况。奇异性指数能够进一步识别和区分局部矿致异常和非矿致异常,重点辅助判别元素高背景叠加高异常情况下的矿化作用,并圈定有利成矿区。

Based on the Mn and Sn element stream sediments geochemical survey in Guizhong basin,this paper uses concentration-area(C-A) model,multifractal spectrum,spectrum-area(S-A) model and singularity index to analyze the enrichment of elements and anomaly separation.The C-A model extracts most of the ore-induced anomalies.The S-A model identifies the local weak anomalies and the high background without ore-induced geochemical anomalies.The singularity distinguishes local metallogenic anomaly and inmetallogenic anomaly,identifies mineralization under high background with high anomaly,and delineations the favourable metallogenic area.