佳木斯隆起带乌拉嘎断裂西缘 1:5万水系沉积物测量方法研究

前人研究成果表明,有机质吸附作用使样品中的元素产生一定的富集,这种影响随着有机质含量增加而越加强烈,将掩盖元素真实含量的起伏,造成假异常.通过对佳木斯隆起带乌拉嘎断裂西缘水系沉积物样品的分配及有机质含量特征、主要成矿元素的表生地球化学分布特征的研究,认为野外截取-10～+60目粒级段作为采样介质,可完全满足工作需要,获得真实可靠的地球化学异常,取得较好的地质找矿效果.

1:50 000 STREAM SEDIMENT SURVEY ON THE WESTERN MARGIN OF WULAGA FAULT IN JIAMUSI UPLIFT ZONE

Previous researches show that organic adsorption can concentrate elements in the sample to some extent. Such an effect becomes stronger with the increasing organic contents and can shield the real undulation of the elements and even form false anomalies. Based on a study of the stream sediments on the western margin of Wulaga fault in Jiamusi uplift zone in such aspects as sample distribution, characteristics of organic matter and supergene geochemical features of major ore-forming elements, the authors hold that the adoption of -10～+60 mesh as the sampling media can meet the need of the work, obtain real and reliable geochemical anomalies and attain fairly satisfactory ore-prospecting result.