| 华北东部早白垩世花岗岩侵位的伸展地球动力学背景:激光40 Ar/39 Ar年代学证据 |
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| 引用本文： | 杨进辉,吴福元,钟孙霖,罗清华.华北东部早白垩世花岗岩侵位的伸展地球动力学背景:激光40 Ar/39 Ar年代学证据[J].岩石学报,2008,24(6):1175-1184. |
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| 作者姓名： | 杨进辉 吴福元 钟孙霖 罗清华 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京,100029
2. 台湾大学地质科学系,台北,106 |
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| 摘 要： | 早白垩世古道岭岩体位于华北克拉通东部的辽东半岛,主要由三种岩石组成,分别为庙岭变形闪长岩、万家岭片麻状花岗闪长岩和古道岭中粒二长花岗岩及其所含的细粒镁铁质包体.其中闪长岩和花岗闪长岩具有明显的变形组构,其片麻理方向与围岩万福糜棱岩相同,表明该岩体为同构造岩体.利用单颗粒激光40Ar/39Ar年代分析方法测定的岩体不同岩相和糜棱岩中单矿物(角闪石、黑云母、钾长石)的40Ar/39Ar年龄表明,古道岭岩体边缘相和围岩糜棱岩在早白垩世(120～113Ma)共同经历了变形、变质作用,揭示了在早白垩世时期该区的快速冷却(抬升)历史.这一地质事件遍布辽东半岛,乃至华北克拉通东部,并与华北克拉通东部大面积拉伸盆地的形成、大规模金成矿作用、A型花岗岩的就位和变质核杂岩的形成同期,是华北东部早白垩世克拉通破坏和岩石圈强烈减薄作用的浅部地壳响应.
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| 关 键 词： | 古道岭岩体 辽东半岛 华北克拉通 岩石圈减薄 激光40Ar/39Ar年代学 |
The extensional geodynamic setting of Early Cretaceous granitic intrusions in the eastern North China Craton: Evidence from laser ablation 40Ar/39 Ar dating of K-bearing minerals |
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| YANG JinHui,WU FuYuan,ZHUNG SunLin,LUO QingHua.The extensional geodynamic setting of Early Cretaceous granitic intrusions in the eastern North China Craton: Evidence from laser ablation 40Ar/39 Ar dating of K-bearing minerals[J].Acta Petrologica Sinica,2008,24(6):1175-1184. |
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| Authors: | YANG JinHui WU FuYuan ZHUNG SunLin LUO QingHua |
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| Abstract: | Early Cretaceous Gudaoling batholith,distributed in the Liaodong Peninsula,eastern North China Craton,is composed by three types of grantoids,deformed diorite at Miaoling,gnessie granodiorite at Wanjialing,medium-grained monzogranite and enclave at Gudaoling.The diorite and granodiorites have evidently gnessis structures,indicating that they had experienced ductile deformation. The directions of foliations and lineations are accordant with those of host mylonites at the lower plate of a normal fault,suggest... |
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