因子分析在成矿多样性定量化研究中的应用--以滇西北富碱斑岩矿产类型成矿多样性分析为例

成矿多样性是复杂成矿系统中矿化地质体外在表现的基本特征,当前成矿多样性研究的难点是成矿特征的定量化问题.因子分析是多元统计中常用方法之一,以往地质研究中常用其解决复杂的地质成因及矿化叠加问题.作者运用因子分析对滇西北富碱斑岩相关矿产类型成矿多样性定量化问题进行了尝试性探讨.根据主要控矿岩体岩石化学成分及岩石学指标,通过R型因子分析,得到了5个具有重要地质成因意义的主因子,并进一步计算了5个主因子的因子得分.结果显示,不同矿产类型其R型主因子的因子得分存在明显差异,而这种差异可以作为矿产类型成矿多样性的定量化表征.

Application of factor analysis to quantitative research for minerals type diversity related to alkali-rich porphyry in northwest of Yunnan, China

Ore-forming diversity is a seemingly basic character of mineralized geologic body in a complicated metallogenic system. Currently, the difficulty of the ore-forming diversity research is the quantification of metallogenic characteristics. Factor analysis is a kind of common method within multi-statistics and usually used to solve the genesis problem of a complex geologic body or a mineralizing superimposed body. In this paper, the authors try to use it to approach the quantification of ore-forming diversity. They also discuss a case concerning minerals type diversity related to akali-rich porphyry in the northwest of Yunnan. Based on lithochemical components and petrologic indexes, through R-type factor analysis, five principal factors implying important geologic significances are found. Furthermore, the authors calculate the score of every principal factor. The inclusion shows that the score of principle factors are notablely different between principle factors. Therefore, this difference can be a kind of quantitative expression for different mineral types.