【摘要】 野外地质和室内岩相学、岩石地球化学特征研究表明 ,东昆仑造山带存在大量后造山期花岗岩。在此基础上 ,对其重要地段的典型样品进行了4 0 Ar/39Ar同位素年龄测定 ,分别得到 14 2 .14± 1.98Ma ,2 0 7.3 5± 0 .86Ma和 2 2 3 .6± 1.3Ma三个坪年龄。结果表明 ,本地区印支末期已经进入后造山作用阶段 ,该阶段延续时间可能较长 ,一直延续到燕山期———典型的陆内碰撞时期。本文从岩石地球化学和同位素年代学角度对本区酸性岩浆活动的构造环境和时限进行了制约。更多还原

【Abstract】 There exist lots of post-collision granites in Eastern Kunlun, based on the field geological work, petrography and petrochemistry study. The ⁴⁰Ar/³⁹Ar isotope ages of typical samples were determined and 142.14±1.98 Ma,207.35±0.86 Ma and 223.6±1.3 Ma are obtained. It concludes that the post-collision event was taken place in the late Indosinian epoch and it might last a long time, till to Yanshan. And the Yanshan magmatism was in the tectonic environment of inner-plate. The time and the tectonic environment of the acid magmatism in the Eastern Kunlun orogenic belt is constrained in this paper.更多还原