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《Journal of Jilin University(Earth Science Edition)》 2012-S3
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LA-MC-ICP-MS Zircon U-Pb Dating of the Luowenyu Granite Intrusions and Its Geological Significance in Eastern Hebei Province

Lu Jilong,Shi Houli,Zhao Yuyan,Hao Libo,Wei Qiaoqiao,Zhao Xinyun College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China  
The Luowenyu granite intrusion is located in the subunit of the yanshan table fold belt in the North China platform-the middle of Malanyu uplift.In order to ascertain the relationship of gold mineralization and Luowenyu stock,a research on LA-MC-ICP-MS zircon U-Pb’s age and petrogeochemical characteristics of Luowenyu stock was performed.The results of Dating show that the formation time of granite was(196.7 ±7.0) Ma.MSWD is equal to 3.8.It belongs to the early Yanshanian time period.The petrogeochemical characteristics:SiO2(69.87%-75.36%),Al2O3(13.18%-14.51%),Na2O(4.18%-4.89%),K2O(3.61%-4.11%).A/NK(1.137-1.168),A/CNK(1.064-1.103).It also belongs to the weakly-peraluminous granite.The rare earth element with content ∑REE ranges from 66.70×10-6 to 232.57×10-6 with ∑LREE/∑HREE between 2.88 and 4.32.It belongs to the light rare earth-enriched type.δEu varies between 0.114 and 0.400,with a significant negative Eu anomaly.The formation age and tectonic environment of Luowenyu stock are consistent with Qingshankou,Niuxinshan,Yuerya and other rocks.The rock type is as I-type granite,belonging to the crustal anatectic granite.The formation age is early Yanshanian.There are large and medium-sized gold deposits in the vicinity of qingshankou,niuxinshan and other rocks,e.g.jinchangyu,Huajian,et al.Therefore,Luowenyu rock surroundings have the potential to form large and medium-sized gold deposit.
【Fund】: 国家公益性行业基金项目(Sinoprobe-04-05-3);; 中央高校基本科研业务费专项(200903043 201103040)
【CateGory Index】: P597.3
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