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| 多重分形方法在水系沉积物地球化学异常下限中的应用—以老挝丰沙里省窑房地区为例 |
| Application of Multifractal Method in Geochemical Anomaly Threshold of Stream Sediments: The Case of Yaofang Area in Phongsaly Province, Laos |
| 投稿时间：2014-04-25 修订日期：2014-04-25 |
| DOI： |
| 中文关键词: 分形 异常下限 水系沉积物 含量-求和法 地球化学 |
| 英文关键词:fractal threshold stream sediment fractal-summation method geochemistry |
| 基金项目:其他项目:境外商业性区化项目(YNKC2012) |
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| 中文摘要: |
| 本文较详细的阐述了传统的统计学方法与分形含量-求和法求取异常下限的理论模型及步骤，并利用Q-Q图直观地检验了老挝丰沙里省窑房地区水系沉积物中Au、Cu、Pb、Zn元素在地球化学场中不满足正态分布或对数正态分布，而是满足两个层次的分形分布，从而利用最小二乘法拟合各个层次的直线方程求出分维数D，直线相交处对应的ri为各元素的异常下限。此外，通过对比发现：地球化学异常场分维数的大小可代表地球化学过程的强烈程度；分形方法圈定的异常范围较大、较连续，利于圈定隐伏、半隐伏矿体形成的弱异常，在红层建造的地层中效果更为显著。 |
| 英文摘要: |
| This paper describes the theoretical model and steps of calculating the threshold by the traditional statistical method and the fractal-summation method. It intuitively tests with the Q-Q diagram that Au, Cu, Pb, Zn elements in stream sediments of Yaofang area in Phongsaly Province in Laos do not meet the normal distribution or lognormal distribution in the geochemical field, but to meet the fractal distribution of two levels. Thus calculating dimension D by least square method fitting the linear equation at all levels. It’s the threshold for each element in the line corresponding to ri. In addition,Sfound by contrast: The geochemical anomaly field fractal dimension can represent the strong degree of geochemical processes. If anomaly range delineated by fractal anomaly is larger, more continuous, it will conducive to the delineation of weak abnormal of concealed, half concealed orebody . The effect is more significant in the Stratum of red layer construction. |
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