江西德兴西湾钠长花岗岩的激光质谱^(40)Ar/^(39)Ar等时年龄  

40 AR/ 39 AR ISOCHRON AGE OF THE XIWAN ALBITE GRANITE IN DEXING,JIANGXI,DETERMINED BY THE LASER MASS SPECTROMETRY

作　　者：胡世玲[1] 郝杰[1] 李曰俊[1] 

机构地区：[1]中国科学院地质研究所

出　　处：《中国区域地质》1998年第1期66-68,共3页Regional Geology of China

基　　金：国家自然科学基金

摘　　要：对采自江西德兴西湾钠长花岗岩的样品进行了激光质谱４０Ａｒ／３９Ａｒ年龄测定，得到等时年龄为（９２７９±１８６）Ｍａ。该年龄代表了赣东北蛇绿岩套中浅色侵入体部分的钠长花岗岩冷却到３５０℃左右时的结晶年龄，把它作为该蛇绿岩套形成时代的上限。结合近年来已经发表的有关该区蛇绿岩套的ＳｍＮｄ、ＵＰｂ和４０Ａｒ／３９Ａｒ同位素年龄数据，本文就该蛇绿岩套的形成年龄和构造侵位年龄进行了讨论。Ar/Ar 39 isochron dating of the Xiwan albite granite in Dexing,Jiangxi,yielded an isochron age of (927 9±18 6) Ma This age is the crystalization age of the albite granite acomponent of the bleached intrusion in the Northeast Jiangxi ophiolite suite when it was cooled to 350℃ The age should be the upper limit of the formation age of the ophiolite suite Through consulting the recently published Sm Nd,U Pb and 40 Ar/ 39 Ar ages of related rocks,the formation and tectonic emplacement ages of this ophiolite suite are discussed in this paper

关 键 词：江西 激光质谱 等时年龄 氩40 氢39 钠长花岗岩 

分 类 号：P588.121[天文地球—岩石学]