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| 吉林东部大蒲柴河adakites锆石U-Pb年龄、Hf同位素特征及其意义 | |
| 引用本文： | 刘燊,胡瑞忠,冯彩霞,冯光英,于晓飞,李才,贾大成,齐有强,王涛.吉林东部大蒲柴河adakites锆石U-Pb年龄、Hf同位素特征及其意义[J].岩石学报,2009,25(12):3153-3164. |
| 作者姓名： | 刘燊 胡瑞忠 冯彩霞 冯光英 于晓飞 李才 贾大成 齐有强 王涛 |
| 作者单位： | 1. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳,550002;西北大学大陆动力学国家重点实验室,西安,710069 2. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳,550002 3. 吉林大学地球科学学院,长春,130061 4. 吉林大学地球探测科学与技术学院,长春,130061 |
| 基金项目： | 国家自然科学基金，西北大学大陆动力学国家重点实验室开放课题基金 |
| 摘 要： | 地球化学研究表明,大蒲柴河岩体具有典型的埃达克岩特征,来自加厚下地壳的部分熔融作用.本文采用激光等离子质谱对该岩体进行了U-Pb同位素定年,结果表明该岩体为晚侏罗世(165Ma)岩浆活动的产物.锆石的LA-MC-ICPMS Hf同位素研究结果显示,ε_(Hf)(165Ma)范围为-5.02～5.43,二阶段Hf模式年龄(t_(DM2))范围为965～1622Ma,暗示原始母岩浆为两种不同源区岩浆的混合.另外,Hf同位素研究表明,研究区在中-新元古代时(965～1304Ma)曾经历了一次重要的地壳增生事件. |
| 关 键 词： | 埃达克岩 锆石U-Pb年龄 锆石Hf同位素 侏罗世 |
Zircon U-Pb age, Hf isotopic compositions of Dapuchaihe adakites in eastern Jilin Province and their significance |
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| LIU Shen,HU RuiZhong,FENG CaiXia,FENG GuangYing,YU XiaoFei,LI Cai,JIA DaCheng,QI YouQiang,WANG Tao.Zircon U-Pb age, Hf isotopic compositions of Dapuchaihe adakites in eastern Jilin Province and their significance[J].Acta Petrologica Sinica,2009,25(12):3153-3164. | |
| Authors: | LIU Shen HU RuiZhong FENG CaiXia FENG GuangYing YU XiaoFei LI Cai JIA DaCheng QI YouQiang WANG Tao |
| Abstract: | Based on geochemical evidence, the quartz diorites from Dapuchai, eastern Jilin Province, belong to typical adakites derived from partial melting of thickened lower crust. Zircon U-Pb dating by LA-ICPMS technique indicates that the studied plutons were emplaced during Late Jurassic with an age of 164.9 ± 0.8Ma. Zircon Hf analyses conducted by LA-MC-ICPMS show that these adakites have variational ε_(Hf) (165Ma)values from -5.02 to 5.43, and Hf model ages from 965Ma to 1622Ma, indicating that the primary magma of the adakites originated from mixing of two different magma, one from partial melting of pre-existing crustal source that was separated from a depleted mantle source during the Middle Proterozoic; While the other magma from asthenospheric mantle through underplating during 985 ～ 1304Ma, indicative of an important crustal growth beneath the studied area. |
| Keywords: | Adakites Zircon U-Pb age Zircon Hf isotopes Jurassic |
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