河北省一个铁矿钠质交代岩石的多元统计研究

河北省的一个接触交代型铁矿是一个富铁矿床。铁矿与燕山期中性岩浆侵入杂岩有成因联系,中性岩浆侵入杂岩包括角闪闪长岩-闪长岩和二长岩-闪长岩两个岩石系列。与铁矿关系最密切的岩体侵入在中奥陶统马家沟碳酸岩地层中。

THE MULTIVARIATE STATISTICAL STUDIES ON THE NATROREPLACEMENT ROCKS IN AN IRON DEPOSIT OF PROVINCE HEBEI

This paper deals with the synthetic applications of several multivariate statistical methods such as discriminant analysis for two groups, discriminant analysis for several groups, stepwise regression analysis, cluster analysis, factor analysis, and in connection with the investigations of natroreplacement rocks occurring in an iron deposit of Province Hebei it indicates the importance of natroreplacement rocks as a guide for iron deposit exploration. Here the natroreplacement rocks in an investigated region have been divided into four classes, i.e. non-replacement rocks, natroreplacement rocks, intensive natroreplacement rocks and altered rocks of superim-position, with various degree of natroreplacement and mineral constitution. For the purpose of classification of natroreplacement rocks and gradation of natroreplacement intensity, the discriminant analysis both for two groups and for several groups offer satisfactory results. The application of stepwise regression analysis, cluster and factor analyses provides new approach and results for the studies on paragenesis of elements and the genetic relationship between the iron deposit and the natroreplacement. In addition, the authors demonstrate that synthetic application of several multivariate statistical methods in solving geological problems has attracted attention in mathematical geology.