Mesoproterozoic granites on Hainan island are composed of granite, granodiorite with the same origination, and show an evolution series evidently from granite to granodiorite and quartz-diorite with the evolution trend to calc-alkalic.

• 海南岛中元古代花岗岩岩体主要由二长花岗岩、花岗冈长岩等岩石组成，构成一个明显的 自花岗岩向花岗闪长岩和英云闪长岩的岩浆演化系列及钙碱性演化趋势。