收稿日期: 2007-01-25
修回日期: 2007-05-08
网络出版日期: 2007-06-10
基金资助
国家自然科学基金项目“基于小波变换的多重分形分析与地球物理和地球化学异常的分解”（编号：40674073）资助.
Multifractal Mode Study of Geochemical Fields Based on “Element Area Concentration” Method
Received date: 2007-01-25
Revised date: 2007-05-08
Online published: 2007-06-10
从多重分形理论出发，在赤峰地区的2个区域应用“元素含量—面积（C-A）”模型方法。对“元素含量—面积”双对数图的形态进行分析，将地球化学异常多重分形特征模式分为3种类型：模式Ⅰ为可拟合为2条直线段的简单多重分形模式，具有该模式的元素在研究区内没有成矿富集的趋势，不存在实质性的致矿异常；模式Ⅱ为可以拟合为3条直线段的高富集多重分形模式，它在模式Ⅰ的基础上叠加有高含量的异常场，具有该模式的元素在研究区内存在较强的局部富集，成矿的可能性很大；模式Ⅲ为可拟合成3条直线段的低富集多重分形模式，它在模式Ⅰ的基础上叠加的是较弱的异常场，具有该模式的元素在研究区内有较弱的矿化作用。在此基础上，分析了元素的成矿富集规律和空间分布特征，确定了区域异常和局部异常的异常下限，划分了地球化学背景、区域异常和局部异常。
关键词： 多重分形模式; 地球化学异常; C-A多重分形模型
文战久 , 姚振兴 , 高星 . 基于“元素含量—面积”模型方法的地球化学场的多重分形模式分析[J]. 地球科学进展, 2007 , 22(6) : 598 -604 . DOI: 10.11867/j.issn.1001-8166.2007.06.0598
Based on the C-A method of the multifractal theory, two geochemical fields in Chifeng area, Inner Mongolia are studied.The results show that the geochemical fields have three different multifractal modes：The first one is a simple multifractal model with only two parts and the geochemical elements have no mineral enrichment；The second one is a mighty enrichment multifractal model with three parts,and it has a superposition of strong enrichment anomaly in the first one；The third one is a weak enrichment multifractal model with three parts and it has a superposition of weak enrichment anomaly in the first one. Based on these,The enrichment mode of the geochemical elements and their distribution in space are discussed and the anomaly lower limit can be obtained and then the geochemical backgrounds、regional anomalies and local anomalies are distinguished.
Key words： Geochemical anomaly; Multifractal mode; C-A; Multifractal model.
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