北山戈壁荒漠景观1∶5万地球化学测量方法研究

1∶50000 GEOCHEMICAL PROSPECTING METHODS AND TECHNIQUES IN GOBI DESERT LANDSCAPE IN THE BEISHAN AREA, NORTHWESTERN CHINA

通过在西北北山地区进行剖面和面积性方法试验,研制出了一套适合于西北荒漠戈壁景观条件的地球化学测量方法,即包括样品布局、采样密度、样品介质、样品粒级以及不同类型的地球化学测量方法技术。试验结果证实,每平方千米采集>20目的沟谷粗碎屑介质样品,能够圈定出清晰的矿化异常,而且异常元素组合齐全,指示意义明确,较准确地反映了矿体或矿化体的形态和延伸方向。同时辅助采集植物———红莎样品和<80目细粒级样品(提供热释汞分析),可以提取掩埋矿化体的信息。

A suite of geochemical survey methods including sampling distribution, sampling density, sample medium, sample grade, which are appropriate for geochemical survey in Gobi desert, have been proposed through method testing in cross section and surface area in the Beishan area, northwestern China. The test results indicated that the methods could clearly circle mineralizing anomalies with complete element association, definite indicating effect and reflecting exact shapes and extended directions of ore and mineralizing bodies, by collecting >20 mesh coarse clastic rock samples in gullies in each 1km^2. Meanwhile, plant Hongsha samples and <80 mesh fine grade samples for heating-release mercury measurement should be collected to extract information of buried mineralizing bodies.