山东大磨曲家矿区成矿元素多重分形特征  

Multifractal characteristics of various metallogenic elements in Damoqujia ore deposit,Shandong province.

作　　者：万丽[1] 王庆飞[2] 杨立强[2] 

机构地区：[1]广州大学数学与信息科学学院,广州510006 [2]中国地质大学地质过程与矿产资源国家重点实验室,北京100083

出　　处：《岩石学报》2007年第5期1211-1216,共6页Acta Petrologica Sinica

基　　金：国家自然科学基金项目(No.40572063);教育部"跨世纪人才培养计划"和地质过程与矿产资源国家重点实验室开放基金(GPMR200626);中国博士后科学基金(2005038361)

摘　　要：通过矩方法,以无序数据集中不同品位级次内的频率为测度,研究了胶东大磨曲家金矿矿体及玲珑花岗岩、胶东群等近矿围岩的Au、Ag、As等主要成矿元素分布的广义谱曲线(D_q-q)和多重谱曲线(f(α)-α)特征。在权重-0.2≤q≤1. 6时,结果显示矿体与近矿围岩中成矿元素品位分布的广义谱和多重谱特征存在明显的区别。矿体中三种成矿元素的广义谱曲线近似直线,而多重谱曲线的宽度较小,显示成矿元素品位级次密集,较为均匀,接近简单分形;近矿围岩中广义谱曲线弯曲明显,多重谱曲线的宽度较大,显示近矿围岩中元素品位级次范围较宽,相对不均匀。同时,矿体中多重谱曲线f(α)的极值所对应的α比近矿围岩中的小,代表最或然子集的品位增加,指示成矿元素在矿体中富集。多重分形分析显示矿体中的成矿元素较近矿围岩中变得更为富集而均匀。Via the method of moments, the frequency in the different scaled grade segments in a sorted data series taken as the measure, the generalized spectrum（ Dq -q） and multifractal spectrum （f（α） -α） of various elements in different geological bodies in the Damoqujia deposit are studied. In case of that the order of moment （q） ranges from -0.2 to 1.6, the multifractal characteristics of the various elements in the orebody and the wallrocks, including Ling, long granite and Jiaodong group, are obviously different. The generalized spectrum （Dq -q） in the orebody is like straight line and the width of multifractal spectrum is narrow; However, generalized spectrum in wallrocks is bended obviously and the width off（α） is wider than that in the non-mineralized area. The spectrum differences reveal the element grade distribution in the oredody is denser and more homogeneous than that in the wallrocks. In addition, in the multifractal spectrum, the α value corresponding to peak off（α） in the oredody is small than that in wallrocks, reflecting the grade increment of most probable subset and the enrichment of metallogenic elements in orebody. Therefore, Multifractal analysis reveals that metallogenic elements are more concentrated and homogeneous in orebody than those in wallrocks.

关 键 词：成矿元素 品位分布 多重分形谱 大磨曲家 胶东 

分 类 号：P612[天文地球—矿床学]