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| 中国东部岩石圈减薄时间的制约及构造控制因素探讨 | |
| 引用本文： | 袁平,王俊烈,齐成栋,卢兴波,张俊影.中国东部岩石圈减薄时间的制约及构造控制因素探讨[J].吉林地质,2008,27(1). |
| 作者姓名： | 袁平 王俊烈 齐成栋 卢兴波 张俊影 |
| 作者单位： | 1. 吉林省地质调查院,吉林,长春,130061 2. 辽宁省第六地质大队,辽宁,普兰店,116000 3. 吉林省区域地质矿产调查所,吉林,长春,130022 |
| 摘 要： | 华北地块中生代含幔源包体玄武岩同位素年龄、岩石化学、地球化学及Sr-Nd同位素研究成果表明:119 Ma~110 Ma之间华北地块岩石圈地幔性质由富集型岩石圈地幔转化为亏损的软流圈地幔,岩石圈地幔性质的显著变化,说明中国东部岩石圈减薄的主要时间发生在早白垩世晚期119~100 Ma之间。中生代古太平洋伊泽奈崎大洋板块(Izanagi Plate)向欧亚板块俯冲所导致的拆沉,应是岩石圈减薄的重要控制因素。 |
| 关 键 词： | 华北地块 中生代 Sr、Nd同位素 岩石圈减薄 拆沉 |
A research on the time-restricted and structure-controlling of the lithosphere becoming thin in east China |
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| YUAN Ping,WANG Jun-he,QI Cheng-dong,LU Xing-bo,ZHANG Jun-ying.A research on the time-restricted and structure-controlling of the lithosphere becoming thin in east China[J].Jilin Geology,2008,27(1). | |
| Authors: | YUAN Ping WANG Jun-he QI Cheng-dong LU Xing-bo ZHANG Jun-ying |
| Institution: | YUAN Ping1,WANG Jun-lie2,QI Cheng-dong3,LU Xing-bo3,ZHANG Jun-ying31.Institute of Geological Survey of Jilin Province,Changchun 130061,Jilin,China,2.The Sixth Geologic Survey of Liaoning Province,Pulandian 116000,Jilin,China,3.Survey of Regional Geology and Mineral Resources of Jilin Province,Changchun 130022,Jilin,China |
| Abstract: | The isotopic age,petrochemistry,geochemistry and Sr-Nd isotope studies of Mesozoic the mantle inclusion-bearing basalt in north China massif show that during 119Ma-110Ma,the mantle quality of the lithosphere in north China massif was transformed from rich lithosphere mantle into deficiency asthenosphere mantle.The marked changing of the mantle quality of the lithosphere tells the lithosphere in east China is thinned up,that took place during uppermost,Lower Cretaceous 119Ma-100Ma.Mesozoic ancient Pacific Izanagi Plate subducting under Eurasian Plate led to delamination,that should be the important controlling factor of the lithosphere becoming thin. |
| Keywords: | north China massif Mesozoic Sr Nd isotope lithosphere becoming thin delamination |
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