攀枝花矿区水系沉积物的组成及其环境效应

Composition of Water Sediments in Panzhihua mine Area and Its Environmental Effect

研究了攀枝花矿区水系沉积物的矿物成分、粒度组成特征,并用X射线荧光分析法分析了不同粒度样品中重金属的含量。结果表明:攀枝花市区水系沉积物以矿物集合体形式存在,其矿物组成以石英为主,粘土矿物次之,矿物含量基本为石英>伊利石>绿泥石>方解石>长石,另有少量白云石或钠闪石;细粒水系沉积物中的粘土矿物含量高于粗粒样品。沉积物呈不规则状,棱角明显,磨圆度差,主要为自然风化冲刷物,同时夹杂有人为的工业活动产物。由于粘土矿物有较强的吸附能力,因此重金属在细粒样品中的含量明显高于粗粒。

The mineral composition and size distribution of the water sediments in Panzhihua mining area are studied and the heavy metal content in the samples of different size fractions is analyzed. The results shows that the water sediments in the mining area of Pazhihua City occurs in mineral aggeregates consisting of mainly quartz and secondarily clay minerals. They contain mainly quartz 〉 illite 〉 chlorite 〉 calcite 〉 feldspar, and also small amount of dolomite or riebekite. The water sediments have a content of fine clay mineral higher than that of course one. The sediments are irregular shaped and poorly rounded and have clear edges and corners. They are mainly the naturally weathered and eroded materials and mean-while have some products of industrial activity. As the clay minerals have a strong adsorption capacity, the heavy metal content in fine samples is evidently higher than that in course samples.