摘要
从多维分形理论出发,利用C-A多维分形模型方法对宁镇铜多金属成矿带1∶200 000水系沉积物地球化学数据进行研究,分析区内与成矿相关元素的含量与面积双对数关系,得到元素的区域异常下限及局部异常下限,并通过与85%累计频率法及均值加2倍标准离差法对应的异常下限进行对比分析,认为研究区内C-A多维分形模型方法确定的局部异常下限及其异常范围更为合理,并体现了最小面积最大含矿率的原则,同时,还从多维分形的角度验证了研究区内成矿的多期性,并且认为Cu、Pb、Zn的成矿潜力较好,Ag次之,Au要稍差一些。
Based on the multifractal theory,the C-A method of Multifractal model is used to study stream sediment geochemical data of 1∶200 000 scale in Nanjing-Zhenjiang copper-polymetallic metallogenic belt,and the regional anomaly lower limit and local anomaly lower limit of the elements are obtained by analyzing area-concentration double logarithmic chart of the ore-forming elements.The research results show that the local anomaly lower limit and the corresponding anomaly area obtained by the C-A method of multifractal model is more reasonable than that obtained by the method of cumulative percentage of 85% and the method of Mean plus 2 times the standard deviation and it is also consistent with the principle of maximum potential rate with minimum area through comparing with the local anomaly lower limit of different methods and comparing with the relationship between mineral and the anomaly area of different methods.The result of multi-phase of mineralization in this region is also recognized by the multifractal theory,and the mineralization potential of Cu,Pb,Zn is adequate,followed by Ag and then Au.
出处
《金属矿山》
CAS
北大核心
2012年第12期79-83,共5页
Metal Mine
基金
中国地质调查局项目(编号:1212010881615)
关键词
多维分形
C-A模型
异常下限
地球化学异常
成矿潜力
宁镇
Multifractal theory
C-A multifractal model
Local anomaly lower limit
Geochemical anomaly
Mineralization potential
Nanjing-Zhenjiang region
