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在很多砂岩型铀矿床中 ,可以发现铀与有机质之间有着密切关系 ,这种关系可以是数理统计意义上的、空间上的或化学的。本文以吐哈盆地十红滩地区砂岩型铀矿为研究对象 ,对有机质在后生砂岩型铀矿成矿中的作用进行了探索。研究区砂岩型铀矿含矿岩系中的有机质属腐殖型 ,其原始母质为陆生高等植物 ,有机质成熟度很低 ,处于热演化作用的褐煤阶段。铀与有机碳的相关性分析和分离实验表明铀成矿富集与有机质关系密切 ,在铀矿石中铀与有机质主要以腐殖酸吸附或腐殖酸盐形式存在。笔者认为 ,在氧化带有机质被氧化破坏 ,形成可溶性的铀腐殖酸络合物淋滤进入地下水 ,在过渡带以腐殖酸盐的形式沉淀下来 ,并造成过渡带矿石中有机碳含量的增高
In many sandstone-type uranium deposits, uranium can be found closely related to organic matter, and this relationship can be mathematical, spatial or chemical. In this paper, the sandstone-type uranium deposits in Shihongtan area of Turpan-Hami basin are taken as the research object to explore the role of organic matter in the mineralization of lateritic sandstone-type uranium deposits. The organic matter in the ore-bearing rock series of sandstone-type uranium deposits in the study area is of humic type. Its original parent material is terrestrial higher plants. The organic matter has a low degree of maturity and is in the lignite stage of thermal evolution. Uranium and organic carbon correlation analysis and separation experiments show that enrichment of uranium mineralization and organic matter closely related to uranium ore uranium and organic matter mainly humic acid adsorption or humic acid salt form. The author believes that oxidation of organic matter is oxidative damage, the formation of soluble uranium humic acid complex leached into groundwater, in the transitional zone as a form of humate precipitation, and cause the transition zone ore of organic carbon content increased