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。
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.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2005年第2期234-241,共8页
Geotectonica et Metallogenia
基金
中国地调局地质调查项目"海南 1: 25万琼海县(E49C001002)区域地质调查(项目编号: 200113000041)"阶段性研究成果.
