云南个旧南部地区元素地球化学特征

ELEMENT GEOCHEMICAL CHARACTERISTCS IN THE SOUTH OF THE GEJIU ORE DISTRICT, YUNNAN PROVINCE

在野外调研和大量样品采集分析的基础上 ,运用数学地质中对应分析和因子分析两种方法对样品和变量进行分类划分和成因解释。首先 ,将样品和元素进行综合计算 ,按第一、二因子轴作出样品 元素因子平面图 ,在图上划分四个象限 ,按象限进行分类 ,探讨其样品 元素分类规律。其次 ,按象限计算因子载荷矩阵 ,分析各因子轴所代表的元素共生组合规律和成矿期次。根据上述研究认为第一因子轴 (F1)所代表的Sn、Cu、Pb、Zn、Au、Ag等元素为主成矿元素组合和主成矿期次 ,而其它因子轴所代表的Mo、W、Bi、Be等元素为次成矿元素组合和次成矿期次。成矿作用是在区域构造应力驱动力的作用下 ,与花岗岩侵入有关。成矿溶液除来自深源以外 ,还与周围基性岩体 (脉 )和围岩密切相关 ,矿液实质是一种混合矿浆 ,在上升运移过程中 ,充填在有利的构造部位和有利的地层层位中形成矿体。

On the basis of study and analysis of a number of samples, the authors have studied them using the mathematic method. Firstly , samples and elements are comprehensively calculated using the theory and methods of corresponding analysis. The sample and element factor plane diagram is made according to the first and second factors. On the diagram four quadrants are parted and the rules of sample element classification are approached. Secondly, the factor loading matrix is calculated according to quadrant using factorial analysis and elementary paragenetic rules of combination and metallogenic epoch represented by factor axis are analyzed. Finally, it is concluded that Sn, Cu, Pb, Zn, Au, Ag and so on represented by the first factor axis are main metallogenic element grouping and main metallogenic epoch and Mo, W, Bi, Be and so on represented by other factor axes are secundarii metallogenic element grouping and secundarii metallogenic epoch. Metallization acted by driving force from region tectonic stress is granite intrusion. Ore solution not only comes from the deep of earth but also has intimate correlation to basites(basic vein) and wall rock. The propitious structures and strata are filled by ore solution during the course of ascending migration. Thus, the orebody is formed.