广西平果堆积型铝土矿成矿元素多重分形特征

Multifractal Characteristics of Metallogenic Elements of Pingguo Accumulated Bauxite in Guangxi

以桂西平果堆积矿为研究对象,采用矩分析法对采集于太平和那豆分矿区的14 421个堆积矿样品含量数据进行了多重分形分析,探讨了堆积矿中铝、铁和硅元素的分形分布特征。结果表明堆积矿铝、铁和硅元素含量分布符合多重分形模型,说明外生矿床成矿元素含量分布也符合多重分形特征。通过对比分析那豆和太平分矿区堆积矿的铝、铁和硅元素的多重分形谱和特征谱参数,表明那豆分矿区富集铝元素,而太平分矿区富集铁元素。分形特征参数的差别代表了两分矿区堆积矿元素分布的差异性;导致两分矿区堆积矿矿化和元素含量分布差异可能的原因是矿区堆积矿所受风化剥蚀强度的不同,并据此初步探讨了堆积矿在风化剥蚀环境中元素分离的趋势。

In western Guangxi the accumulated bauxite was taken as the study object. The method of mo- ments is used to analyze the grade data of 144 421 samples collected from Taiping and Nadou ore deposits. Then the multifractal characteristics of aluminum, iron and silicon in accumulated bauxite are studied. Fi- nally, the result illustrates that the grade distributions of aluminum, iron and silicon in Pingguo bauxite are in line with the model of multifractal obviously, and so this leads to the conclusion that the distribution of metallogenic elements of exogenic deposit is in line with the model of multifractal. The comparative a- nalysis of the multifractal spectrum and parameters of aluminum, iron and silicon from Taiping ore deposit and Nadou ore deposit shows that aluminum is enriched in Nadou ore deposit and iron is enriched in Taip- ing ore deposit. The differences of multifractal spectrum parameters indicate the differences of grade distri- bution between the two ore deposits. This may be attributed to the different intensity of denudation acting on the accumulated bauxite. Accordingly, the trend of elemental detachment of the accumulated bauxite in the weather-worn environment is Dreliminarilv discussed.