吉林省东部森林覆盖区地球化学测量的方法试验

Orientation Survey for Geochemical Prospecting in Forest-covered Area in East Jilin Province

以吉林省东部和龙地区的水系沉积物、土壤为研究对象,进行了森林覆盖区地球化学测量的条件试验,研究了不同季节、不同粒级水系沉积物与不同层位、不同粒级土壤中元素的分布规律,以及有机质含量对元素含量的影响;综合样品粒级组成、有机质对元素含量影响等因素,确定出水系沉积物样品粒级为-10^+60目,土壤采样的层位为B层土,样品粒级为-60目;根据确定的样品粒级,进行了1∶5万水系沉积物和土壤地球化学测量的异常圈定效果对比,得出水系沉积与土壤物地球化学测量对已知金属矿点(床)均有较好的识别能力,说明所确定的水系沉积物和土壤样品粒级是合理的。

An orientation survey for geochemical prospecting in the forest-covered area in East Jilin Province was carried out through sampling stream sediment and soil samples.The distribution of elements both in stream sediment with different size fractions from varied sampling seasons,and in soils with different size fractions in various horizons were investigated,and the effects of organic contents to the element distributions in stream sediements and soils were evaluated.The results show that the suitable size fractions for stream sediment samples were-10 - ＋ 60 mesh,while those for soil samples from B horizon were less than 60 mesh.With above size fractions of stream sediments and soils,a comparison between the anomalies delineated by geochemical surveys of stream sediments and soils with a scale of one to 50 000 were made,which shows that both the stream sediment and soil geochemical surveys had the similar capability in tracing the locations of some given metal ore occurrences.