| 肥东杂岩的锆石U-Pb年龄及其地质意义——兼论下扬子地区新元古代岩浆活动历史 |
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| 引用本文： | 李云剑,朱光,顾承串,张帅,刘程,牛漫兰,苏楠,肖世椰.肥东杂岩的锆石U-Pb年龄及其地质意义——兼论下扬子地区新元古代岩浆活动历史[J].地质论评,2018,64(3):551-568. |
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| 作者姓名： | 李云剑 朱光 顾承串 张帅 刘程 牛漫兰 苏楠 肖世椰 |
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| 作者单位： | 合肥工业大学资源与环境工程学院 |
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| 基金项目： | 本文为国家自然科学基金项目（编号：41772228）的成果。 |
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| 摘 要： | 近年来在下扬子西缘地区厘定的一系列新元古代火成岩,为认识该区扬子板块新元古代岩浆活动历史与规律提供了窗口。结合本次与前人锆石U-Pb年代学数据,指示下扬子地区张八岭群、肥东杂岩与董岭杂岩内变火成岩的原岩时限分别为767~748 Ma、812~745 Ma和829~754 Ma。这些新元古代火成岩分别是峰期为750 Ma、800 Ma和825 Ma岩浆活动的产物。下扬子地区峰期为825 Ma的岩浆活动只出现在靠近江南造山带的南部。锆石年代学信息显示,下扬子地区还发生过峰期为840 Ma、2010 Ma和2454 Ma岩浆活动,但缺失1000~860 Ma的岩浆活动。通过区域对比表明,攀西—汉南弧没有延入下扬子地区。下扬子地区南部受到峰期为840 Ma的弧岩浆活动的影响。扬子板块上峰期为825 Ma的岩浆活动及早阶段的南华裂谷应是江南造山带后造山伸展的产物;而峰期为800 Ma和750 Ma的岩浆活动与相应的南华裂谷扩展,代表了Rodinia超大陆裂解的全面影响。
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| 关 键 词： | 下扬子地区 岩浆活动 新元古代 张八岭群 肥东杂岩 董岭杂岩 |
Zircon U-Pb Ages and Their Geological Significance of the Feidong Complex:Some Comments on Neoproterozoic Magmatism History in the Lower Yangtze Region |
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| LI Yunjian,ZHU Guang,GU Chengchuan,ZHANG Shuai,LIU Cheng,NIU Manlan,SU Nan and XIAO Shiye.Zircon U-Pb Ages and Their Geological Significance of the Feidong Complex:Some Comments on Neoproterozoic Magmatism History in the Lower Yangtze Region[J].Geological Review,2018,64(3):551-568. |
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| Authors: | LI Yunjian ZHU Guang GU Chengchuan ZHANG Shuai LIU Cheng NIU Manlan SU Nan and XIAO Shiye |
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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,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: | Lower Yangtze region magmatism Neoproterozoic Zhangbaling Group Feidong Complex Dongling Complex |
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