马里亚纳海槽玄武岩K-Ar定年及其地质意义  

K-Ar DATING OF MARIANA TROUGH BASALTS AND ITS SIGNIFICANCE

作　　者：高永军[1] 穆治国[1] 刘玉林[1] 黄宝玲[1] 

机构地区：[1]北京大学地质系,北京100871

出　　处：《地质地球化学》2000年第3期65-68,共4页Geology-Geochemistry

摘　　要：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 。Basalts collected from the spreading ridge of Mariana Through between 14°49′14″ and 18°15′14″ are dated by conventional K\|Ar method, in combination with studies on their petrology and geochemistry, trace elements and REE. The opening and development history of the Mariana Through are discussed as well. The opening and related basaltic magmatism has been lasted since Late Miocene and the peak time was at 2-4 Ma. It is thought that the opening and evolution of the Trough may be controlled by the hot region in this area.

关 键 词：马里亚纳海槽玄武岩 空间演化特征 钾-氩定年 

分 类 号：P588.145[天文地球—岩石学] P597.3[天文地球—地质学]