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| 藏北羌塘地块中部蓝片岩中捕获锆石SHRIMP U-Pb定年及其意义 | |
| 引用本文： | 邓希光,张进江,张玉泉,刘敦一.藏北羌塘地块中部蓝片岩中捕获锆石SHRIMP U-Pb定年及其意义[J].地质通报,2007,26(6):98-702. |
| 作者姓名： | 邓希光 张进江 张玉泉 刘敦一 |
| 作者单位： | 1. 国土资源部广州海洋地质调查局,广东,广州,510760 2. 北京大学地球与空间科学学院,北京,100871 3. 中国科学院广州地球化学研究所,广东,广州,510640 4. 中国地质科学院地质研究所北京离子探针中心,北京,100037 |
| 基金项目： | 国家自然科学基金项目(编号:40202023)，国家重点基础研究发展规划项目(编号:G1998040800)，高等学校全国优秀博士学位论文作者专项资金项目(编号:200022)资助 |
| 摘 要： | 羌塘中部2个蓝片岩样品中锆石的SHRIMp U-Pb定年结果表明,锆石属于残留锆石,不是蓝片岩相变质作用形成的新生锆石,这些年龄代表源区原岩的年龄或原岩捕获锆石的年龄,是不同构造-热事件的响应。首次在藏北羌塘地区获得了锆石SHRIMP U-Pb年龄2533Ma,说明这颗锆石来自新太古代,虽然不一定源自本地,但至少暗示羌塘地区新太古代曾经可能发生过构造-热事件。 |
| 关 键 词： | 锆石SHRIMP U-Pb年龄 蓝片岩 羌塘地块中部 西藏 |
| 文章编号： | 1671-2552（2007）06-0698-05 |
| 收稿时间： | 2006-09-25 |
| 修稿时间： | 2006-09-252006-12-06 |
SHRIMP U-Pb dating of zircons from blueschist in the central part of the Qiangtang block, northern Tibet, China, and its implications. |
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| DENG Xi-guang,ZHANG Jin-jiang,ZHANG Yu-quan,LIU Dun-yi.SHRIMP U-Pb dating of zircons from blueschist in the central part of the Qiangtang block, northern Tibet, China, and its implications.[J].Geologcal Bulletin OF China,2007,26(6):98-702. | |
| Authors: | DENG Xi-guang ZHANG Jin-jiang ZHANG Yu-quan LIU Dun-yi |
| Institution: | 1. Guangzhou Marine Geological Survey, Guangzhou 510760, Guangdong, China; 2. School of Earth and Space Sciences, Peking University, Bering 100871, China; 3. Gnangzhou Institute of Geochemistry, Chinese Academy of Sciences, Gnangzhou 510640, Guangdong, China; 4. Bering SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
| Abstract: | SHRIMP U-Pb dating of zircons from two blueschist samples in central Qiangtang,northern Tibet,suggests that the zircons in blueschist are relict ones rather than neogenic ones formed by blueschist facies metamorphism.These ages stand for those of protoliths in source regions or those of zircons captured by protoliths and are responses to different tectonothermal events.The SHRIMP U-Pb zircon age of 2533 Ma obtained for the first time in the central Qiangtang area,northern Ti- bet,indicates that the zircon originated from the Late Archean rocks,and although the zircon may not necessarily have origi- nated in the study area,its age at least implies that a tectonothermal event may have occurred in the Qiangtang area in the late Archean. |
| Keywords: | SHRIMP U-Pb zircon age blueschist central Qiangtang block Tibet |
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