论文部分内容阅读
新疆十红滩铀矿床是中国近年发现的层间氧化带型砂岩铀矿床。该矿床位于吐鲁番—哈密盆地西南部的艾丁湖斜坡带西侧,赋矿地层为中侏罗统西山窑组辫状河—曲流河相的含煤碎屑岩系;矿体严格受发育于河道砂体中的层间氧化带前锋线控制,矿体形态呈卷状或板状;含矿岩石主要为灰—深灰色疏松和次疏松细—粗粒长石石英砂岩,铀主要以吸附形式存在;全岩Pb同位素测定的主成矿年龄为24 Ma。研究认为:晚侏罗世后,持续干热气候条件下,层间氧化带的充分发育,高含氧水在富铀地层砂体中持续向前运移,在富还原剂地球化学障形成铀沉淀富集,是该铀矿床的成因。
The Shihongtan uranium deposit in Xinjiang is an interlayer oxidation zone type sandstone uranium deposit discovered in recent years in China. The deposit is located on the west side of the Aiding Lake slope belt in the southwestern Turpan-Hami basin. The ore-bearing strata are coal-bearing clastic rocks of braided river-meandering river facies in the Xishayao Formation of the Middle Jurassic. The ore bodies are strictly developed The interlayer oxidation zone in the channel sand body is controlled by the strike forward line, and the ore body is in the shape of a roll or plate. The ore-bearing rocks are mainly composed of gray-dark gray loose and sub-loose fine-coarse feldspathic quartz sandstone, The main mineralization age of total Pb isotopic dating is 24 Ma. The study shows that, after the Late Jurassic, under the continuous dry-hot climate, the interlayer oxidation zone is well developed, the high-oxygenated water continues to move forward in the enriched-uranium formation sand body, and the uranium Precipitation enrichment is the cause of this uranium deposit.