Zircon U-Pb Ages, Geochemical Characteristics and Geological Significance of Early Cretaceous Granites in Fengcheng Area, Eastern Liaoning Province
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摘要: 辽东凤城地区出露的大面积花岗岩一直是华北克拉通北缘岩石圈减薄的研究热点，但花岗岩的岩石年龄、成因及构造环境等方面的研究尚不够深入.以辽东凤城地区帽盔山二长花岗岩、蛟羊峪花岗闪长岩、清凉山二长花岗岩为研究对象，采用岩石学、岩石地球化学及LA-ICP-MS锆石U-Pb测年方法，讨论了花岗岩的岩石成因及构造意义.帽盔山二长花岗岩、蛟羊峪花岗闪长岩、清凉山二长花岗岩中锆石具有典型的岩浆振荡生长环带和较高的钍铀比（Th/U>0.4），LA-ICP-MS锆石U-Pb年龄分别为127.2±0.6 Ma、122.9±1.1 Ma、129.0±0.8 Ma，均形成于早白垩世.岩石地球化学特征显示帽盔山二长花岗岩和清凉山二长花岗岩为高钾钙碱性A型花岗岩，具有富Si、富碱，贫Al、Fe、Ca、Mg的特征，Eu负异常较为明显；蛟羊峪花岗闪长岩为准铝质到过铝质岩石，微量元素富集Nd、Tb、La，亏损Sr、P、Ti.构造环境判别结果显示，上述3个花岗岩体均形成于伸展拉张的构造环境.以上研究表明，辽东凤城地区在早白垩世时期处于非造山的伸展环境，是华北克拉通岩石圈减薄和克拉通破坏作用的缩影.Abstract: The magmatic rocks, which is widely distributed in Fengcheng area, Liaodong peninsula, is always a hot spot for study of North China Craton (NCC) thinning in recent years. However, due to lack of precise age and geochemical constraints in previous research, its petrogenesis and tectonic setting still remain controversial. In this paper, three granite plutons were studied by the petrology, petrogechemistry and LA-ICP-MS zircon U-Pb ages. The Maokuishan monzogranite, Jiaoyangyu granodiorite and Qingliangshan monzogranite were emplaced with the ages of 127.2±0.6 Ma, 122.9±1.1 Ma and 129.0±0.8 Ma, respectively. These granites were all constrained to Early Cretaceous. The zircons of granites have the characteristics of oscillatory growth zonation and high ratios of Th and U (Th/U>0.4), indicating a magmatic origin for the zircons. Geochemical characteristics suggest that Maokuishan and Qingliangshan monzogranites are both metaluminum A-type and peraluminous high-K calc alkaline granites, and the major elements are characterized by high Si, alk and low Al, Fe, Ca and Mg. The chondrite-normalized REE patterns have a moderate negative Eu anomalies. Jiaoyangyu granodiorites are metaluminum-peraluminous granodiorites, and the trace elements are enriched in Nd, Tb, La, and depleted in Sr, P, Ti. Combined with geological background, the three granite plutons in Fengcheng area discussed above were all formed in anorogenic extensional tectonic setting during Early Cretaceous, and also is the epitome of the lithosphere thinning and cratonic destruction of the North China Craton.
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图 1 辽宁省凤城市帽盔山地区地质简图(a)和大地构造位置图(b)
Fig. 1. Geological sketch map (a) and regional location map (b) of Maokuishan area in Fengcheng, Liaoning Province
图 2 研究区早白垩世花岗岩的宏观和显微特征
a、b.帽盔山二长花岗岩；c、d.蛟羊峪花岗闪长岩；e、f.清凉山二长花岗岩.图中符号：Q.石英；Pth.条纹长石；Pl.斜长石；Bi.黑云母；Hb.普通角闪石
Fig. 2. Macro and micro characteristics of the Early Cretaceous granites from study area
图 3 研究区早白垩世花岗岩的锆石CL图像
Fig. 3. CL images of zircon of the Early Cretaceous granites from study area
图 4 研究区早白垩世花岗岩的锆石U⁃Pb年龄谐和图
Fig. 4. Concordia diagrams showing zircon U⁃Pb ages of the Early Cretaceous granites from study area
图 5 研究区早白垩世花岗岩的含铝指数图(a)和SiO2⁃K2O图解(b)
Fig. 5. Aluminous index (a) and SiO2⁃K2O (b) diagrams of the Early Cretaceous granites from study area
图 6 研究区早白垩世花岗岩的稀土元素配分曲线图(a)和微量元素蛛网图(b)
Fig. 6. REE patterns (a) and trace element spider diagrams (b) of the Early Cretaceous granites from study area
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