|
|||||
|
|
| 北祁连山东段新元古代火山岩的年代学证据 | |
| 引用本文： | 于福生,王春英,杜国民.北祁连山东段新元古代火山岩的年代学证据[J].中国地质,2002,29(4):360-363. |
| 作者姓名： | 于福生 王春英 杜国民 |
| 作者单位： | 1. 中国科学院高能物理研究所,北京,100039 2. 甘肃省第三地质勘察院,甘肃,兰州,730050 3. 宜昌地质矿产研究所,湖北,宜昌,443000 |
| 基金项目： | 原地质矿产部1∶万(石门川幅)区域地质调查项目 |
| 摘 要： | 在1∶5万石门川幅、老龙湾幅区域地质调查时发现,北祁连山东段上吊吊坡地区存在一套不同于下奥陶统阴沟群的火山岩,经全岩样品Sm-Nd同位素测定,获得Sm-Nd等时线年龄为(723±25.0)Ma,表明其形成时代为新元古代。地球化学特征表明该套火山岩形成于岛弧环境,说明当时北祁连东段仍处于洋壳俯冲挤压环境。 |
| 关 键 词： | 新元古代 岛弧 火山岩 祈连山 钐－钕同位素 形成时代 |
| 文章编号： | 1000-3657(2002)04-0360-04 |
Chronological evidence of Neoproterozoic volcanic rocks in the eastern segment of the North Qilian Mountains |
|
| Yu Fu-sheng,WANG Chun-ying,DU Guo-min.Chronological evidence of Neoproterozoic volcanic rocks in the eastern segment of the North Qilian Mountains[J].Chinese Geology,2002,29(4):360-363. | |
| Authors: | Yu Fu-sheng WANG Chun-ying DU Guo-min |
| Institution: | YU Fu-sheng 1,WANG Chun-ying 2,DU Guo-min 3 |
| Abstract: | Abstract: According to the geological survey of 1:50000 Shimenchuan Sheet and Laolongwan Sheet, volcanic rocks different from those in the Early Ordovician Yingou Goup have been found in the Shandiaodiaopo area, Jingtai County in the eastern segment of the North Qilian Mountains. Sm-Nd isochron dating of the volcanic rocks shows that they formed during the Neoproterozoic, about 723 million years ago. REE and trace element and trace element geochemical characteristics suggest that a compressional environment resulting from subduction of oceanic crust occurred there at that time. |
| Keywords: | eastern se gment of the North Qilian Mountains Neoproterozoic island-arc volcanic roc ks |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《中国地质》浏览原始摘要信息 | |
| 点击此处可从《中国地质》下载免费的PDF全文 | |