【摘要】 海南岛中北部三叠纪花岗岩的锶、钕同位素初始比值分别为I(Sr)0. 7080 ~0. 71505、εNd(t) -10 ~-5,表明这些花岗岩属壳源型,其源岩主要为海南岛结晶基底中元古界抱板群,但受到了幔源岩浆的混染。这些花岗岩所表现出来的基本一致的锶、钕同位素特征,表明测区具有统一的前寒武纪基底。更多还原

【Abstract】 The initial Sr and Nd isotope ratios for the intermediate-acid, crust-sourced granite in the central-northern part of Hainan Island in the Hercynian-Indosinian are I（Sr） 0.7080～0.71505 and ε_Nd（t）-10～-5. It is inferred in this paper that the source rock is mainly the Baoban group in the Mid-Proterozoic crystalline basement, which could be contaminated by mantle magma. The fact that the Sr and Nd isotope features show no remarkable difference indicates that a united Precambrian basement occurred in the surveyed area.更多还原