摘要
单颗粒锆石U-Pb同位素测年法是测定前寒武纪地体地质年代的较好方法之一。本文利用该方法对福建前寒武纪地体中一些争论较大的地层、岩体进行锆石U-Pb同位素年龄测定,并详细论述了测年数据的地质含义,确定了这些地层和成岩及变质热事件年代。笔者认为目前在闽西北地区地表露头尚未发现太古宙地层,但其中的捕获锆石年龄有太古时期的信息;目前出露最老的地体形成于古元古界,中元古界较多见;加里东时期形成的新生锆石信息也较多。
Today it is an one of better methods to dating ages of forming-rocks of Precambrian terrain to using single grain zincon. Author has used this method and detained geological significance of dating forming-rocks and metamorphic event ages of strata and body that is discussed by many geologists whose have of two opinings, and then consider Archean strate is obsented on ground outcrop in North-West of Fujian Province. But there are information of Archean from enveloped zincon age. The oldest strate on groud outcrop form in paleoproterozoic. Middle Proterozoic widely distributed. There are more informations about new forming zircon in Caledonian movement.
出处
《地质调查与研究》
2007年第1期13-21,共9页
Geological Survey and Research
基金
国土资源部中国地调局1:25万邵武幅
1:25万福州等五幅大调查项目
华南武夷块元古宙演变过程
