对马里亚纳海槽弧后扩张脊上所采集的玄武岩样品进行了系统的K -Ar定年 ,同时结合研究玄武岩的微量元素以及稀土元素特征后指出 ,马里亚纳海槽的张开及与之伴随发生的玄武岩浆活动自晚中新世以来一直都在进行 ,其主活动期为 2～ 4Ma。海槽玄武岩年龄在空间上具有从南到北逐渐变新的演化规律。据此 ,推断该海槽的扩张演化可能受控于该区内热区的迁移及运动规律 The systematic K-Ar dating of the basalt samples taken from the post-arc extension ridge in the Mariana Trough combined with the study of the trace elements of basalts and the characteristics of rare earth elements indicates that the opening of the Mariana Trough and its correlation with The accompanying basaltic magmatism has been underway since the Late Miocene, and its main active period is 2 ~ 4Ma. The age of trough basalts has the evolutionary law of space gradually changing from south to north in space. Based on this, it is inferred that the expansion of the trough may be controlled by the migration and movement of hot zones in the area