摘要
吐鲁番—哈密盆地十红滩铀矿床属层间氧化带型砂岩铀矿床,位于吐鲁番—哈密自流水盆地南缘的艾丁斜坡带上,含矿含水层赋存于中侏罗统水西沟群西山窑组含煤碎屑岩中,主要岩性为砾岩、含砾粗—中粒长石石英砂岩,赋存孔隙承压水,渗透系数为0 .14～0 .5 3m/ d,现代地下水流向总体由南向北,地下水为高矿化度的Cl·SO4 —Na型水,地下水中铀含量最高可达2 .2 4 5 1mg/ L,其主要以U O2 (CO3) 2 形式迁移。研究认为:区域上有利的地下水补—径—排系统是形成该矿床的前提条件,局部构造作为局部补给源影响着地下水的流向,进而控制层间氧化带及铀矿化的形成及展布方向,铀矿化主要产于含水层渗透性相对较好的疏松砂岩中。铀矿床的形成经历了成岩过程的预富集和后期层间氧化带成矿作用两个阶段。至今,铀成矿作用仍处于发展演化过程中。
The Shihongtan uranium deposit in Turpan-Hami basin, Xinjiang, is an interlayer oxidized zone type sandstone uranium deposit. It is located in the Aiding Lake slope zone, southwest of the Turpan artesian basin. The ore-bearing aquifer occurs in the coal-bearing detrital rocks of the Middle Jurassic Xishanyao Formation. The main rocks include conglomerate and gravel-bearing arkosic quartz sandstone, containing confined pore water, and the permeability coefficient ranges 0.14 to 0.53 m/d. The groundwater generally flows from south to north at present, and is of the highly mineralized Cl·SO 4-Na type. The maximum uranium content may reach 2.245 mg/L, and the uranium mostly migrates in the form of UO 2(CO 3) 2. The authors consider that the favorable groundwater recharge-runoff-drainage system in the region is the premise condition for formation of the uranium deposit. The local structure as a local recharge source has effects on the groundwater flowing direction, and further controls the formation and contribution of the interlayer oxidation and uranium mineralization zones. Uranium mineralization mainly occurs in loose and permeable sandstone. The formation of the uranium deposit has experienced two phases: pre-concentration of uranium in the diagenetic process and metallogenesis in the interlayer oxidation zone in the later phase. The uranium mineralization is still in the processes of development and evolution.
出处
《地质论评》
CAS
CSCD
北大核心
2005年第3期257-263,共7页
Geological Review
基金
国家计委Ⅰ类重点资助项目 (编号 970 3 110 1)的成果
关键词
吐哈盆地
十红滩
铀矿床
水文地质特征
矿床成因
hydrogeology
confined water
interlayer oxidation zone
sandstone-type uranium deposit
metallogenesis
Shihongtan
Turpan-Hami basin
Xinjiang
