Method of MF-DFA and distribution characteristics of metallogenic elements: example from the Dayin′gezhuang gold deposit,China
Method of MF-DFA and distribution characteristics of metallogenic elements: example from the Dayin′gezhuang gold deposit,China
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发表时间：
2012
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通讯作者：
Shao Ren-xiang
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作者：
Shao Ren-xiang
在正态检验和增广Dickey-Fuller检验的基础上，应用多重分形化波动分析和多重分形谱分析方法，研究了山东大尹各庄金矿床-290m水平漂移中Au的长程相关性和多重分形谱特征，并对多重分形谱的宽度差异和不对称性进行了分析。结果表明，剔除若干二阶非线性趋势后，消除趋势波动函数FQ(S)与标度具有良好的幂函数关系。广义赫斯特指数是一个关于q的非线性函数，h(2)均小于1但大于0.5，表明矿体在特定地质背景下的发育相对稳定，与大尹各庄金矿床的实际情况一致。研究还表明，各漂移带的多重分维奇异谱曲线具有不对称性和差异性，表明该区金的品位序列具有多重分维特征，而多重分形谱的形状差异可能为矿化强度的识别提供依据。并为进一步确定矿床集中程度和圈定目标矿化带光谱提供指导。
Based on the tests of normality and stability respectively by Jarque-Bera statistics and Augmented Dickey-Fuller test,the methods of multifractal detrended fluctuation analysis(MF-DFA)and multifractal spectrum analysis were applied to study the long-range correlations and multifractal characteristics of Au in the drifts on-290 m level of Dayin′gezhuang gold ore deposit in Shandong province,China.The width difference and asymmetry of multifractal spectrum were also analyzed.The results show that after elimination of a number of second-order non-linear trends,the detrended fluctuation function Fq(s) has a good power-law relation with scale s,the generalized Hurst exponent is a nonlinear function respect to q,and all the values of h(2) is less than 1 but greater than 0.5,which indicates the long-range correlation,and means the development of the orebodies is relatively stable under the specific geologic background and consistent with the facts in Dayin′gezhuang gold ore deposit.The results also show that the multifractal singular spectrum curves of the drifts are non-symmetrical and differ from each other,which indicates the grade series of Au in the region is characterized by multifractal features,while the shape differences of multifractal spectrum may offer an evidence for the identification of mineralization intensity,and provide guidance for further determination of the extent of deposit concentration and delineation of a target mineralization zone spectrum.