四川盆地地质构造演化特征与可地浸砂岩型铀矿找矿前景

本文通过对四川盆地地质构造演化特征的分析,指出由于该盆地基底、盖层结构横向分块的不均一性,在盆地中构造活化弱的地段或抬升剥蚀较早的地段构造形变弱,深埋时间相对短,岩石固结程度较低;其隆坳过渡部位有条件形成较大范围的自流斜坡,有利于形成长期渗入的水文地质条件,是寻找可地浸砂岩型铀矿的目标区。赋存疏松砂体的三叠纪和侏罗纪地层是找矿的目的层。

Geologic-tectonic evolutional characteristics and prospecting potential for ISL-amenable sandstone-type uranium deposits in Sichuan basin

Through the analysis on geologic-tectonic evolution of Sichuan basin,authors of this paper suggest:because of the heterogeneity of the basin basement and cover structures resulting from the lateral dividing,those segments in the basin that experienced only weak tectonic activation,and those that were uplifted and eroded earlier have not been intensely deformed,and have not experienced long-period burying.Rocks in those segments are poorly consolidated and there exist conditions for the formation of large-area artesian slope at the transitional sites between uplifted and subsided areas,possessing favourable hydrogeologic conditions for long-term infiltration of groundwater.These areas must be the targets for prospecting for ISL-amenable sandstone-type uranium deposits.Correspondingly,the Triassic and Jurassic where loose sand bodies are hosted are prospecting target horizons for uranium.