多重分形方法在金属成矿潜力评价中的应用

首先探讨了运用多重分形矩方法过程中数据网格化对结果的影响,随后研究了粤北韶关地区4292km2内1448个基岩样品的25项元素的分形分布规律.结果表明,金属地球化学场元素的α-f(α)曲线上凸且连续;地球化学场中元素在空间上的分布具有连续多重分形特征,与成矿密切相关的微量元素一般显示左侧开口明显大于右侧开口,而非主要成矿元素则右侧开口较大;f(α)曲线的形态特征对于判断金属成矿潜力具有一定的指示意义,所提出的非对称指数能很好地反映这一点.

Application of multifractal to ore-forming potential evaluation

It is of great significance to study the distribution patterns of geochemical elements by using (fractal) and multifractal methods. Based on a typical multifractal method, the moment method, this paper first studies the effect of different grid densities on some results and then, the multifractal spectrum (function) shapes of some elements in metallic geochemical fields. The data used include 25 elements of 1447 whole rock samples from a region of 4290 km~2 in North Guangdong. The results indicate that it is (ubiquitous) that metallic geochemical fields are multifractal. For major ore-forming elements, the range of the left-side of the multifractal spectrum is larger than that of the right-side, but those non-ore-forming (elements) are on the contrary. The shape of multifractal spectrum may provide directions in the study of ore-forming potential. This can be reflected well by the asymmetric index put forward by the authors in the paper.