云南某地1:5万区调各种化探方法找矿经济效果对比

本文通过对云南西南部两个1:5万图幅地球化学水系沉积物测量、土壤测量和岩石测量三种区域化探方法的试验,从找矿、经济两个方面进行对比,得出了三种化探方法找矿效果相近的结论,但水系沉积物测量以其异常衬度高、野外采样工作量小、样品分析费用少而明显优于土壤测量。在试验中得到的另一发现是低密度(每平方公里约2个样)的岩石测量在发现异常信息和了解微量元素分布区域性变化规律方面有好的效果。岩石测量作为一种有效的区域化探方法值得重视和进一步研究。

A COMPARISON OF ECONOMIC EFFECTS OF VARIOUS GEOCHEMICAL PROSPECTING TECHNIQUES IN1:50,000 REGIONAL GEOLOGICAL SURVEY PERFORMED IN A CERTAIN AREA OF YUNNAN PROVINCE

Three geochemical prospecting techniques, i. e., geochemical stream sediment survey, soil survey and rock survey, have been conducted experimentally in two 1:50,000 map areas of southwest Yunnan, and a comparison of these three geochemical methods in the light of their ore prospecting and economic results leads to the conclusion that they have quite similar ore prospecting effects. Nevertheless, the stream sediment survey is obviously better than the soil survey in that it has high contrast for anomaly, less field work for sampling and is comparatively inexpensive in sample analysis. Another conclusion the author has reached in the test is that geochemical rock survey carried out at sparse survey grid, e.g.,approximately two samples for each square kilomreter,can attain fairly satisfactory result in obtaining information of anomalies and understanding regional variation regularity of the distribution of minor elements. Therefore, as an effective regional geochemical prospecting technique, rock survey deserves due attention and further research.