虽然砂岩型矿石中铀的来源大都还是不清楚的,但根据硫同位素资料仍能断定,铀矿床是由于细菌成因硫化氢的沉淀作用而形成的。过去认为某些地区的沉积作用与天然气有关,但同位素证据却不支持这种成因看法。一些断裂控制的矿床和角砾管状矿床也具有某些同位素证据,说明其形成条件与砂岩型矿石相似。地球化学关系表明,盐丘构造以及横切碳酸质沉积物的断裂构造可能是铀矿堆积的有利地点。某些特点为评价盐丘铀矿资源提供了唯一的根据。反映铀矿床中细菌成因的硫同位素资料绝不排斥铀最初作为火成射气物的可能性;而凝灰岩淋滤的机制却能提供一个更适用的模型,以作为美国某些地区勘查的基础。在构制应用于以后勘查中的铀矿分布模型时,本文所讨论的概念将会有很大的助益。 Although most of the sources of uranium in sandstone ore are still unclear, it can be concluded from the sulfur isotope data that the uranium deposit was formed by the precipitation of hydrogen sulfide by bacteria. In the past, it was thought that the sedimentation in some areas was related to natural gas, but the evidence of isotope did not support this genetic reasoning. Some of the fault-controlled deposits and the brecciated tubular deposits also have some isotopic evidence suggesting that they are similar in formation to sandstone-type ores. The geochemical relationships suggest that the salt domes and the fault structures that traverse the carbonate deposits may be favorable sites for uranium accumulation. Some characteristics provide the only basis for evaluating salt uranium resources. Sulfur isotope data reflecting the genesis of bacteria in uranium deposits in no way exclude the possibility that uranium was originally used as an igneous material; the mechanism of leaching by tuffs, however, provides a more applicable model as a basis for exploration in selected areas of the United States. The concept discussed in this article will be of great help in shaping the uranium distribution model that is applied to future exploration.