摘要: What elements should be included in the REE group? This is one of the basic problemsof REE geochemistry. There are different viewpoints about this problem at present. For ex-ample, （1） P. Henderson et al. （1984） consider that, the REE include only lanthanons （Ln）,namely, from lanthanum （La） to lutetium （Lu）, but sometimes they also admit that theyttrium （Y）, showing a similar chemistry to that of the REE, belongs to lanthanons. （2）B. I. Kogon （1979） et al. think that, the REE include n...