甘肃寨上金矿床构造地球化学特征

寨上金矿位于西秦岭中部岷-礼成矿带西部,所发现的三十余条金矿化脉体的空间分布及其产出特征严格受断裂和褶皱的双重控制,以扎麻树背斜为界分为南北2个成矿带,产出的已知矿脉均严格受控于NWW向断裂.通过对寨上金矿50件构造地球化学样品16种微量元素数据的聚类分析、因子分析,以及对样品元素的组合特征研究,北矿带含矿断裂的元素组合为Au,Bi,Pb,Zn;南矿带的为Au,Sb,Hg,Cu,Zn,Pb,Co,Bi,As.以已知的矿与非矿构造样品为母体,利用多元统计判别分析,建立了断裂含矿性的判别函数,并对未知的17个样品进行判别分析,其判别结果与野外验证一致.

Tectonic geochemistry of the Zhaishang gold deposit, Gansu

The Zhaishang gold deposit is located in the middle of west Qinling and west part of the Min-Co-Li mineralization belt. There are more than 30 gold mineralization vein-bodies discovered and their spatial distribution and occurrence features are strictly controlled by both fault and fold. The deposit is divided into 2 mineralization belts (North and South belt) by the Zhamashu anticline, and the known ore bodies occurred in the two belts are strictly controlled by the NWW fault. By cluster and factor analysis to 16 types of microelements data for 50 tectonic geochemistry samples in the Zhaishang gold deposit, and study of the group features to the sample elements, it's found that the element group of the ore-bearing fault in North belt consist of Au,Bi,Pb,Zn; and the group in South belt consist of Au, Sb, Hg, Cu, Zn, Pb, Co, Bi, As. Taking the known ore or non-ore samples as the parent, by using multinariate statistical and discriminant analysis, the discriminant fuction of fault ore-bearing feature has been established, and the discriminant analysis to the unknown 17 samples has been taken. The result is as same as the field works and could be used as guide for gold prospecting works.