摘要
苦海—赛什塘地区变质基性岩墙群由低角闪岩相的斜长角闪岩类岩石组成,成岩年龄为2.213±0.1Ga(Sm—Nd)。其岩石化学、地球化学特征表明岩浆来自亏损的地幔,并显示出这一地区克拉通在古元古代中期发生了一次强烈的裂解事件,形成初始洋盆的古构造背景。
The meta-basic dike swarms is composed of plagioclase amphibolitic rocks of low amphibolite facies in Kuhai-Saishitang area, with a diagenetic age of 2.213+0.1Ga(Sm—Nd). Its petrochemistric and geochemical features indicate that the magma came form the lacked mantle and a strong splitting event of craton landmass was happened in the middle stage of Paleo-Proterozoic era, and the paleostructural setting of initial ocean basin was formed.
