西华山花岗岩以富稀土元素为特征,尤其是第二阶段花岗岩(G-b)和第三阶段花岗岩(G-c)中钇含量很高,除了复杂的钇矿物组合外,石榴子石具有特殊的钇环带构造,中心部分既富钇,又含有多相钇矿物显微包裹体,而晶体的边部被称为“净边”,即钇含量很低,而且也不含任何矿物包裹体.我们提出,石榴子石中心部分富钇与岩浆分异作用造成的熔体富钇是一致的;而石榴子石的“净边”现象则可能是岩浆中越来越富流体的直接结果,流体环境不利于稀土元素进入石榴子石晶格. The Xihuashan granite is rich in rare earth elements, especially in the second phase of granite (Gb) and the third phase of granite (Gc) yttrium content is very high, in addition to complex yttrium mineral assemblage, garnet has a special yttrium Structure, the central part is rich in yttrium and multi-phase yttrium mineral micro-inclusions, and the edge of the crystal is called “net edge”, that is, yttrium content is very low, but also does not contain any mineral inclusions.We propose, The yttrium rich in yttrium in the center of garnet is consistent with the yttrium rich in yttrium due to magmatic differentiation. However, the “net edge” phenomenon of garnet may be the direct result of more and more enriched fluids in magma. The fluid environment is not conducive to rare earth Elements into the garnet lattice.