摘要
地殼上所有岩石與自然水中大部含有極微量之鈾元素，但含原生鈾最豐富者為較酸性之侵入岩或噴出岩。如在此類岩石中鈾能富集成礦，卽造成與火成岩有關之鈾礦床。原生鈾礦物甚易氧化而溶解於地面水及地下水中。此含鈾溶液如流經具有還原物質之砂岩或礫岩時，卽不再被吸收而沉澱成沉積鈾礦床。一般鈾礦床可分為三類型，卽礫岩型、砂岩型、與礦脈型。最後一型係泛指一切以裂隙為控制成礦作用之鈾礦床而言。
關鍵字
無資料並列摘要
Uranium occurs in low concentrations in all rocks and natural waters. Primary uranium concentrations ars greatest in acid intrusive and extrusive rocks in which some leading uranium deposits related to igneous rocks are found. Primary uranium minerals oxidize readily and are soluble in surface and ground waters. Uranium may be preciptated or absorbed to form important sedimentary uranium deposits when such solutions pass through permeable sandstone or conglomerate strata containing reducing substances. Three main types of uranium deposits are known: sandstone-type, conglomerate-type, and "vein" type. The last type includes all deposits in which fractures are the major control of uranium mineralization.