| 松辽盆地林深3 井火山岩的锆石U——Pb 年龄与Hf 同位素组成 |
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| 引用本文： | 金鑫,葛文春,薛云飞,金玉东.松辽盆地林深3 井火山岩的锆石U——Pb 年龄与Hf 同位素组成[J].世界地质,2011,30(1):7-17. |
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| 作者姓名： | 金鑫 葛文春 薛云飞 金玉东 |
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| 作者单位： | 1． 吉林大学地球科学学院，长春130061; 2． 大庆油田有限责任公司勘探开发研究院，黑龙江大庆163712 |
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| 摘 要： | 根据松辽盆地北部林深3 井火山岩的岩相、全岩主微量元素、锆石U--Pb 同位素和锆石Hf 同位素特征的分析结果，探讨了该火山岩的形成时代和岩浆源区。锆石LA--MC--ICPMS U--Pb 研究结果表明: 林深3 井火山岩形成时代约为120 Ma，处于早白垩世中晚期，属于营城组火山岩。锆石的LA-- MC--ICPMS Hf 同位素研究显示，本区火山岩的锆石εHf ( t) 全部为较高的正值，二阶段Hf 模式年龄为789 ～ 1 494 Ma，表明其主要起源于中--新元古代增生的地壳物质，暗示中--新元古代时期兴蒙造山带东段存在地壳增生事件。
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| 关 键 词： | 松辽盆地 林深3 井 火山岩 锆石U--Pb 年龄 Hf 同位素 |
Zircon U-Pb ages and Hf isotopic composition of volcanic rocks from Well Linshen 3 in Songliao Basin |
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| JIN Xin,GE Wen-chun,XUE Yun-fei,JIN Yu-dong.Zircon U-Pb ages and Hf isotopic composition of volcanic rocks from Well Linshen 3 in Songliao Basin[J].World Geology,2011,30(1):7-17. |
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| Authors: | JIN Xin GE Wen-chun XUE Yun-fei JIN Yu-dong |
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| Institution: | 1． College of Earth Sciences，Jilin University，Changchun 130061，China; 2． Exploration and Development Research Institute，Daqing Oilfild Limited Company，Daqing 163712，Heilongjiang，China |
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| Abstract: | The formation time and the source rocks of volcanic rocks from Well Linshen 3 in the northern Songliao Basin have been discussed through the petrography，major and trace elements，zircon U--Pb isotopic data and zircon Hf isotopic data of three samples． Zircon U--Pb dating by LA--ICP MS technique indicated that the volcanic rocks from Well Linshen 3 were erupted at ca． 120 Ma，the middle--late Early Cretaceous，belonging to of the Yingcheng Formation． Zircon Hf analysis conducted by LA--MC--ICPMS showed that all of the volcanic rocks had high εHf( t) positive values with Hf modal ages of 789 ～ 1 494 Ma，indicating the crust in the Songliao Basin extracted from mantle during Meso- and Neoproterozoic，which provides the important evidence of crustal growth during Meso-and Neoproterozoic in eastern Xing--Meng orogenic belt． |
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| Keywords: | Songliao Basin Well Linshen 3 volcanic rocks zircon U--Pb age Hf isotope |
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