| 长江三峡黄陵花岗岩与莲沱组凝灰岩的锆石SHRIMPU—Pb年龄及其构造地层意义 |
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| 引用本文： | 高维,张传恒.长江三峡黄陵花岗岩与莲沱组凝灰岩的锆石SHRIMPU—Pb年龄及其构造地层意义[J].中国区域地质,2009(1):45-50. |
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| 作者姓名： | 高维 张传恒 |
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| 作者单位： | 中国地质大学（北京）,北京100083 |
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| 基金项目： | 中国石化勘探准备项目（编号：G0800-06-ZS-319）和中国地质调查局项目（编号：1212010511607）联合资助 致谢：衷心感谢北京SHRIMP中心刘建辉在离子探针中心对仪器的维护保障和刘征华、张聪、杨自彝协助进行样品测试,同时感谢万渝生对数据分析的帮助与指导,以及与闫全人、牛宝贵就有关构造问题的讨论. |
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| 摘 要： | 华南古陆普遍发育新元古代花岗岩，其时代、成因及其对华南新元古代的构造演化具有标识意义。该类型的花岗岩与华南克拉通的破坏及雪球事件的启动相关，其年代学研究一直备受关注，高质量的锆石SHRIMPU—Pb定年是确定其相互关系的基础。黄陵花岗岩体中的岩浆锆石的SHRIMPU—Pb加权平均年龄为837Ma±7Ma，另获得莲沱组顶部层凝灰岩较年轻的一组岩浆锆石SHRIMPU—Pb加权平均年龄724Ma±12Ma。前者表明黄陵花岗岩与桂北的三防、元宝山和云南的峨山花岗岩体侵位的时间相同，后者确定了莲沱组顶界的时代。这为确定南华系的年代地层学框架提供了重要的科学依据。
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| 关 键 词： | 湖北宜昌地区 黄陵花岗岩 锆石SHRIMP U—Pb年龄 新元古代 构造地层学 |
Zircon SHRIMP U-Pb ages of the Huangling granite and the tuff beds from Liantuo Formation in the ＂ - - significance. Three Gorges area of Yangtze River,China and its geological |
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| GAO Wei,ZHANG Chuan-heng.Zircon SHRIMP U-Pb ages of the Huangling granite and the tuff beds from Liantuo Formation in the ＂ - - significance. Three Gorges area of Yangtze River,China and its geological[J].Regional Geology of China,2009(1):45-50. |
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| Authors: | GAO Wei ZHANG Chuan-heng |
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| Institution: | ( China University of Geosciences, Beijing 100083, China ) |
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| Abstract: | Neoproterozoic granite is well developed in South China continent and its age and origin is a marker for Neoproterozoic tectono-stratigraphic evolution in South China. The isotopic chronologic study of the granites are paid a great deal of attention to as those type of granites developed at the same time with the Neoproterozoic violation in South China and its relationship with the starting of ＂snow-ball＂ that is based on the high-quality SHRIMP U-Pb age. The authors obtained zircon SHRIMP U-Pb dating age from the Huangling granite （a high-quality weighted-mean SHRIMP U-Pb age of 837±7 Ma） and another younger magma （724 Ma± 12 Ma） from tuff bed at the top of the Liantuo Formation in Beijing SHRIMP Center. The former shows the same emplacement time with the granite from Eshan, Yunnan Province and Sanfang, Yuanbaoshan granite plutons from Guangxi Province; the later marked the age of top boundary of the Liantuo Formation and this age suggests that the South China deposition worked on at ca. 724 Ma, and therefore, it is of much importance for calibrating the geological time of the bottom boundary of the Nanhua System and the Neoproterozoic in South China as well. |
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| Keywords: | Yichang area Hubei Huangling granite zircon SHRIMP U-Pb age Neoproterozoic tectono-stratigraphy |
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