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通过系统的矿物学、岩石学、地球化学研究 ,确立了阴山地区印支期碱性岩在空间上分为南北两条近东西走向的岩带。南带以霓辉正长岩为主 ,北带以碱性正长岩为主。南北两带岩体均富集轻稀土元素、大离子亲石元素和高场强元素 ,而Cr、Ni等相容元素含量很低。结合Nd、Sr、Pb同位素特征 ,认为该地区印支期碱性岩源自富集地幔 ,并受到不同程度的地壳物质混染
Through the study of mineralogy, petrology and geochemistry, the Indosinian alkaline rocks in Yinshan area have been established to be spatially divided into two north-south near-east-west belt. The south zone is dominated by Ni-Hui syenite and the northern zone is dominated by alkaline syenite. Both north and south rock mass are rich in light rare earth elements, large ion lithophile elements and high field strength elements, and Cr, Ni and other compatible elements content is very low. Combined with the isotopic characteristics of Nd, Sr and Pb, it is concluded that the Indosinian alkaline rocks originate from enrichment of the mantle and are contaminated by crustal materials to varying degrees