REE geochemistry of some alkali-rich intrusive rocks in China

Based on the REE analyses of about 300 samples from 40 alkali-rich intrusive rocks, a systematic study on the features of REE composition was made, and the major factors controlling the REE distribution are discussed. According to REE, trace elements composition and Sr, Nd isotopic characteristics, the source materials and petrogenetic processes of the alkali-rich intrusive rocks were studied. The petrogenetic models of Zijinshan, Saima, Nianzishan and Shanhaiguan alkali-rich intrusive rocks were calculated using multisequence fractional crystallization and assimilation fractional crystallization models.