粤西云开前寒武纪基底的麻粒岩、紫苏花岗闪长岩和紫苏闪长岩的放射性元素分布具有明显的规律，Ｋ／Ｒｂ比值分别为１１７～２０２，９４～１２９，７８～８９，Ｔｈ／Ｕ比值分别为１５～３０，１１～２０，２５～７８，Ｕ的含量范围分别为０．５×１０－６～０．９９×１０－６，１．２５×１０－６～１．６９×１０－６，１．６５×１０－６～５．３７×１０－６．这种分布规律反映了在低ＸＨ２Ｏ、高ＣＯ２流体参与下麻粒岩的熔融、紫苏花岗质岩浆形成、难熔铁镁相和副矿物相富集的过程 The radioactive elemental distribution of granulite, peridotite granodiorite and peridotite in the basement of the Precambrian basement in the western Guangdong Province had obvious regularity with K / Rb ratios of 117 ~ 202,94 ~ 129, 78 ~ 89, Th / U ratios were 15 ~ 30, 11 ~ 20, 25 ~ 78, the contents of U were 0.5 × 10-6 ~ 0.99 × 10-6, 1.25 × 10- 6 to 1.69 × 10 -6 and 1.65 × 10 -6 to 5.37 × 10 -6. This distribution reflects the process of granulite melting, peridotitic granitic magma formation, refractory Fe-Mg-rich phase and accessory mineral phase enrichment with low XH2O and high CO2 fluids