吐哈盆地西南缘铀成矿的层位标定

吐哈盆地是中国最近发现的核资源基地，但在2000年以前，这里的地层问题一直困扰着铀矿的勘探和生产。针对目标地层的时代判别与对比，作者除了运用传统的生物地层学和岩石地层学方法外，还成功地将泥岩矿物学和元素地球化学作为辅助标志应用其中。研究结果认为，目标地层形成于早侏罗世晚期至中侏罗世早期，属于水西沟群，主要由八道湾组、三工河组、西山窑组下段、西山窑组中段和西山窑组上段5个地层单位构成。铀矿化主要发育于西山窑组，其下段和上段是最主要的含矿层，中段为次要含矿层。八道湾组和三工河组基本上无矿化。

THE IDENTIFICATION OF URANIUM METALLOGENIC STRATA AT THE SOUTHWEST MARGIN OF THE TURPAN-HAMI BASIN

The Turpan-Hami Basin is a new nuclear resource base, but before 2000, its uranium prospection and production enforced difficulty because of the stratum problem of the uranium bed. The authors distinguish and compare the strata by using not only biological stratigraphy and rock stratigraphy but also mudstone mineralogy and element geochemistry. The research finds that the target strata, which are named Shuixigou Group, were formed from late Lower Jurassic stage to early Middle Jurassic stage. It has five stratum units, which are Badaowan Formation, Sangonghe Formation, Lower Member, Middle Member and Upper Member of Xishanyao Formation. Uranium mineralization mainly develops in Xishanyao Formation, especially Lower and Upper Member of Xishanyao Formation. Badaowan Formation and Sangonghe Formation generally have no mineralization.