| 柴达木盆地北缘果可山石英闪长岩LA-ICP-MS锆石U-Pb定年及其成因 |
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| 引用本文： | 王玉松,牛漫兰,李秀财,吴齐,韩雨,赵齐齐,笪梁超.柴达木盆地北缘果可山石英闪长岩LA-ICP-MS锆石U-Pb定年及其成因[J].地质学报,2017,91(1):94-110. |
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| 作者姓名： | 王玉松 牛漫兰 李秀财 吴齐 韩雨 赵齐齐 笪梁超 |
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| 作者单位： | 合肥工业大学资源与环境工程学院，合肥，230009,合肥工业大学资源与环境工程学院，合肥，230009,合肥工业大学资源与环境工程学院，合肥，230009,合肥工业大学资源与环境工程学院，合肥，230009,合肥工业大学资源与环境工程学院，合肥，230009,合肥工业大学资源与环境工程学院，合肥，230009,合肥工业大学资源与环境工程学院，合肥，230009 |
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| 基金项目： | 中国地质调查局地质调查项目 |
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| 摘 要： | 柴达木盆地北缘果可山地区石英闪长岩LA-ICP-MS锆石U-Pb定年获得的206 Pb/238 U加权平均年龄为247±3 Ma。石英闪长岩由斜长石(55%~60%)、石英(15%~20%)、角闪石(10%~15%)和黑云母(5%~10%)组成,属准铝质-弱过铝质系列(A/CNK=0.95~1.02),具有I型花岗岩特征。样品富集轻稀土元素和大离子亲石元素(K、Rb、Cs、Ba、Th等),相对亏损重稀土元素和高场强元素(Nb、Ta、P、Ti等),类似弧岩浆岩。样品中MgO含量(2.04%~2.44%)和Mg#值(48.9~51.9)均高于变玄武岩/变泥岩在1~4GPa压力下部分熔融形成的熔体,且包含大量暗色包体,这暗示它们可能是由角闪岩相下地壳部分熔融产生的岩浆和富集地幔来源的岩浆发生混合而成。低的锆石Ti温度和高Ce~(4+)/Ce~(3+)比值,表明其结晶自低温、高氧逸度岩浆,岩浆形成过程中可能有富水熔体/流体的加入。在花岗岩构造环境判别图解上,样品均落在火山弧环境;同时,样品La/Nb比值(2.27~2.64)与活动大陆边缘区高La/Nb比值(2.0)特征相吻合。结合区域地质背景分析,我们认为果可山石英闪长岩形成于古特提斯洋向北俯冲的活动大陆边缘弧环境。
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| 关 键 词： | 果可山 石英闪长岩 锆石U Pb定年 岩石成因 构造环境 |
| 收稿时间： | 2015/12/29 0:00:00 |
| 修稿时间： | 2016/3/8 0:00:00 |
LA-ICP-MS Zircon U-Pb Dating and Petrogenesis of the Quartz Diorites from the Guokeshan Area in the Northern Margin of the Qaidam Basin |
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| WANG Yusong,NIU Manlan,LI Xiucai,WU Qi,HAN Yu,ZHAO Qiqi and DA Liangchao.LA-ICP-MS Zircon U-Pb Dating and Petrogenesis of the Quartz Diorites from the Guokeshan Area in the Northern Margin of the Qaidam Basin[J].Acta Geologica Sinica,2017,91(1):94-110. |
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| Authors: | WANG Yusong NIU Manlan LI Xiucai WU Qi HAN Yu ZHAO Qiqi and DA Liangchao |
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| Institution: | School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009 and School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009 |
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| Abstract: | |
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| Keywords: | Guokeshan quartz diorites zircon U Pb dating petrogenesis tectonic environment |
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