二连盆地砂岩型铀矿土壤氡异常模型及应用

二连盆地是我国北方重要的砂岩型铀矿产地之一。为提取地表弱矿化信息,建立直接找矿标志,在盆地内实施面积型土壤氡及其子体测量,通过剖面、平面叠合铀矿化信息分析,建立了砂岩型铀矿土壤氡异常模型:即土壤氡气异常往往位于铀矿体上游一侧,异常值高达15000 Bq/m3以上,矿体上方大多为氡气背景值,而矿体下游一侧多为氡的偏高晕。此模型揭示二连盆地具有较好的铀成矿潜力,指明了进一步铀矿找矿方向。

Model and application of radon anomaly in soil of sandstone type uranium deposits in Erlian Basin

Erlian Basin is one of the most important sandstone?type uranium fields in northern China. In order to get the weak minerali?zation data at surface and establish the direct prospecting criteria, the authors carried out measurement of areal?type soil radon and its daughter in the basin. According to the analysis of uranium mineralization data as well as the section and plane data, soil radon anomaly of sandstone?type uranium deposits can be built, i.e., radon anomalies in soil are always located in the upstream direction of uranium, with the anomaly value higher than 15 000 Bq/m3 . In general, the upper part of the deposit has the background value of radon, while the larger halos of radon are distributed in the downstream direction of the deposit. On the basis of this model, it can be inferred that Erlian Basin is characterized by fairly favorable potential of uranium mineralization. On such a basis, further prospecting targets can be delineated.