| 基性岩斜锆石U-Pb同位素定年3种方法之比较 |
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| 引用本文： | 李惠民,李怀坤,陈志宏,相振群,陆松年,周红英,宋彪.基性岩斜锆石U-Pb同位素定年3种方法之比较[J].地质通报,2007,26(2):128-135. |
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| 作者姓名： | 李惠民 李怀坤 陈志宏 相振群 陆松年 周红英 宋彪 |
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| 作者单位： | 1. 中国地质调查局天津地质矿产研究所,天津,300170
2. 中国地质科学院地质研究所,北京离子探针中心,北京,100037 |
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| 基金项目： | 国家自然科学基金项目（批准号：40373032）资助.致谢：本文的实验工作得到中国地质科学院周剑雄研究员,地质研究所（北京离子探针中心）陶华、张巧大工程师和西北大学大陆动力学重点实验室柳小明博士的指导和帮助,特此致谢. |
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| 摘 要： | 根据新的研究成果,结合近年来文献报道的资料,对利用3种方法,即同位素稀释-热电离质谱(ID-TIMS)法、高灵敏度高分辨率离子探针质谱(SHRIMP)法、激光烧蚀电感耦合等离子体质谱(LA-ICPMS)法做基性岩斜锆石U-Pb同位素定年的优点和局限性进行比较,并讨论了针对具体样品选择定年方法的基本原则。新的研究成果表明,基性岩斜锆石U-Pb同位素年龄测定的3种方法各有不同的特点及局限性。在实际工作中,根据从具体样品中分选得到的斜锆石的数量、粒度大小、年龄范围、U-Pb含量、测年精度要求等因素,灵活地选择测年方法,对于获得比较理想的测年结果是非常重要的。
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| 关 键 词： | 基性岩 斜锆石 U-Pb同位素定年 |
| 文章编号： | 1671-2552（2007）02-0128-08 |
| 收稿时间： | 2006-10-08 |
| 修稿时间： | 2006-11-22 |
Comparison of three methods for baddeleyite U-Pb isotope dating of basic rocks |
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| LI Hui-min,LI Huai-kun,CHEN Zhi-hong,XIANG Zhen-qun,LU Song-nian,ZHOU Hong-ying,SONG Biao.Comparison of three methods for baddeleyite U-Pb isotope dating of basic rocks[J].Geologcal Bulletin OF China,2007,26(2):128-135. |
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| Authors: | LI Hui-min LI Huai-kun CHEN Zhi-hong XIANG Zhen-qun LU Song-nian ZHOU Hong-ying SONG Biao |
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| Institution: | 1. Tianjin Institute of Geology and Mineral Resources, China Geological Survey,Tianjin 300170, China; 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing SHRIMP Center, Beijing 100037, China |
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| Abstract: | The advantages and limitations of three methods for baddeleyite U-Pb dating of basic rocks, i.e. isotope dilution-thermal ionization mass spectrometry (ID-TIMS), sensitive high resolution ion microprobe (SHRIMP) and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICPMS) are compared based mainly on our studies, combined with references recently reported. The basic principles for selecting methods for baddeleyite U-Pb dating of particular samples are discussed. The studies show that the three methods of baddeleyite U-Pb dating of basic rocks have different characteristics and limitations. It is very important to select methods for baddeleyite U-Pb dating according to the mineral content, grain size, age range, U-Pb content and dating precision requirement of the samples to get relatively ideal results. |
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| Keywords: | basic rocks baddeleyite U-Pb dating |
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