作为碱性岩主体的霞石正长岩是贫铀还是富铀的,在霞石正长岩发育地区里能否找到有价值的工业铀矿床,这是摆在铀矿床和铀地球化学研究者们面前的一个新问题。直到不久以前,在地质界和地球化学界有着这样一种传统的观念,即与花岗岩类酸性岩相比,碱性岩,尤其是富钠的霞石正长岩是贫铀而富钍的,在霞石正长岩中寻找铀的工业矿床是没有什么希望的。费尔斯曼(А.Е.Ферсман)在他的名著“地球化学”第四卷中曾指出:钍“主要进入富碱的 Whether nepheline syenite, which is the main body of alkaline rocks, is depleted uranium or enriched uranium can find valuable industrial uranium deposits in nepheline syenite developmental areas, which was put on by researchers of uranium deposits and uranium geochemistry A new problem before us. Until recently there was a conventional notion in geology and geochemistry that alkaline rocks, especially sodium-rich nepheline syenite, are depleted of uranium and thorium-rich compared to granitic acidic rocks, There is little hope of finding an industrial uranium deposit in nepheline syenite. А.Е. Ферсман pointed out in his famous book “Geochemistry” Volume IV that thorium "mainly enters the alkali-rich