地幔化学不均一性（chemical heterogeneity of mantle）：占地球体积82％和质量67％的地幔，无论是在垂向上还是在横向上二其化学成分都有变化，在较大的尺度上还存在明显变化的界面，称为地幔的化学不均一性。地幔化学不均一性主要是通过对幔源火山岩（或侵入体）的研究获得的。
这表明岩浆起源于受俯冲组分改造或影响的上地幔，且地幔源区存在明显的化学不均一性。
It shows that the magma was derived from the upper mantle which was altered or affected by subduction composition, and the mantle source was of chemical inhomogeneity.
地幔流体ree的研究有助于了解地幔区域化学不均一性、地幔的富集与亏损等地幔地球化学特征。
Study on REE in mantle fluids has significance for understanding of regional geochemical difference, mantle enrichment and depletion.
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