摘要
木文据耀岭河群变质火山岩中，获得的Ｓｍ—Ｎｄ等时线年龄值Ｒｂ—Ｓｒ等时线年龄值，单锆石２０６Ｐｂ／２３８Ｕ的年龄值并结合Ｐｂ、Ｏ同位素研究认为本区因多次构造运动的影响，使同位素均一化，Ｓｍ—Ｎｄ及Ｒｂ—Ｓｒ部分等时线年龄偏低，而单锆石的年龄值，证明兴凯运动早期曾在本区产生热事件。结合区域地质资料，本区耀岭河群的年龄应在７１１—８０５．８Ｍａ之间。
Based on the analysis of Sin -Nd and Rb-Sr isochron ages and the single zircon 206Ph/238U ages obtained from the meta-vocanic rocks of Yaolinghe group in northwestern Hubei, combined with the study of Ph, O isotopic geology, it is considered that the iaotopic system have tended to homogeneity and parts of the Sin-Nd, Rb-Sr isochron ages have been on the low side as a result of the various tectonic movements in this area. On the other side, ages obtained from the single zircons comfirm that there occured a thermal event in the early stage of Xingkai movement in this area. Combined with the regional geology data,the age of the protolith of Yaolinhe group is thought to be 711 -805. 8Ma.
出处
《湖北地质》
1996年第1期48-55,13,共9页
基金
地矿部秦巴重点片"八五"找矿科技攻关二级课题
关键词
鄂西北
耀岭河群
同位素
等时线年龄值
Northewestern Hubei, Yaolinghe group, isotope, isochron age.
