SHRIMP U-Pb zircon dating for lampro

SHRIMP U-Pb zircon dating for lamprophyre from Liaodong Peninsula: Constraints on the initial time of Mesozoic lithosphe

It is undebated fact that the lithospheric mantle beneath eastern China was considerably thinned during the Mesozoic time. However, it has no adequate evidence for the exact timing when the lithosphere thinning started. The Liaodong Peninsula is located in the eastern segment of the North China Craton and is one of the important domains to explore the event of lithosphere thinning. SHRIMP U-Pb zircon dating and geochemical study were carried out for the lamprophyre dike swarm that intruded into the magnesite ore-beds in the Dashiqiao Formation of Paleoproterozoic Liaohe Group at the Huaziyu magnesite ore district, Liaodong Peninsula. The results indicate that these lamprophyre dikes were intruded in late Jurassic (155±4 Ma) and show some geochemical characteristics of potassic magmas. It is now accepted that the lithosphere thinning took place in the late Mesozoic, and the peak thinning stage occurred in early Cretaceous (130―120 Ma). Considering the potassic mafic magmatism marking the onset of the lithospheric thinning, we therefore suggest that the studied late Jurassic potassic lamprophyre dike swarm could imply that the late Jurassic is the time that lithosphere thinning started.

作 者： JIANG Yaohui JIANG Shaoyong ZHAO Kuidong NI Pei LING Hongfei LIU Dunyi   作者单位： JIANG Yaohui,JIANG Shaoyong,ZHAO Kuidong,NI Pei,LING Hongfei(State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China)

LIU Dunyi(Beijing SHRIMP Center, Beijing 100037, China) 

刊 名： 科学通报（英文版）  SCI 英文刊名： CHINESE SCIENCE BULLETIN  年，卷(期)： 2005 50(22)  分类号： P3  关键词： lamprophyre   SHRIMP U-Pb zircon dating   lithosphere thinning   Liaodong Peninsula  

【SHRIMP U-Pb zircon dating for lampro】相关文章：

U-Pb dating of zircon from the bed parallel anatectic granitic intrusion in the Baoban group in Hainan Island and the te04-26

松辽盆地南部变闪长岩SHRIMP锆石U-Pb年龄及其地质意义04-27

北祁连山西段北大河岩群碎屑锆石SHRIMP U-Pb年代学研究04-27

第111讲：shrimp; crab05-04

北阿尔金巴什考供-斯米尔布拉克花岗杂岩特征及锆石SHRIMP U-Pb定年04-26

东天山阿其克库都克断裂南侧花岗岩和花岗闪长岩锆石SHRIMP U-Pb测年及其地质意义04-27

中国菜名中英文对照-龙虾蟹类Seafood (Lobster, Shrimp, Crab)05-04

东天山红柳河地区蛇绿岩U-Pb同位素年龄04-27

花岗岩锆石U-Pb年龄与全岩Rb-Sr等时线年龄对比研究及其地球化学意义04-26