新疆阿舍勒铜矿区及外围表生地球化学分散特征

研究了阿舍勒铜矿区及外围区域岩石-土壤-水系沉积物风化作用体系的地球化学特征,发现:①Ca是研究区最活跃的元素,在土壤40-200cm深度上形成碱性碳酸盐地球化学障──钙积层.②不同地质背景对元素表生活动有制约作用,背景区和异常区元素的表现有明显差异.③从风化岩石→土壤→水系沉积物,Cu、Zn的存在形式发生明显变化,从以硫化物相为主变成以有机相为主.④大多数铜矿化指示元素都富集在<0.5mm的水系沉积物中,并可沿水系迁移到矿区下游7km以外.

SUPERGENE GEOCHEMICAL DISPERSION CHARACTERISTICS OF THE ASHELE COPPER ORE DISTRICT,XINJIANG

Based on a study on the geochemical of the weathering system of regional rook-soil-stream sediments is the Ashele copper ore district ed its outskirts,the authors have found the following regularities:(1)Ca is the most active elements in study area, which has formed an alkaline carbonate geochemical barrier-caliche layer at the soil depth of 40-200cm;(2) different geoingical backgrounds play different roles is gaverning supergene activities of elements, and the behaviors of elemots in the background area are obviously different from their behaviors in the anomaly area; (3)from weathering rocks through soils to stream sediments,the modes of occurrence of Cu cad Zn change remarkably from the dominance of sulfide facies to the dominance of organic facies; (4)most indicator elements of copper mineralization are concentrated in stream sediments with grain size <0.5mm, and can mingrate 7 km along the drainage beyond the ore district.