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Precise determination of Phanerozoic zircon Pb/Pb age by multicollector SIMS without external standardization

文献类型：期刊论文

作者Li, Xian-Hua1; Liu, Yu1; Li, Qiu-Li1; Guo, Chun-Hua1; Chamberlain, Kevin R.2
刊名GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
出版日期2009-04-10
卷号10
关键词SIMS multicollector zircon Pb/Pb age Phanerozoic
ISSN号1525-2027
DOI10.1029/2009GC002400
文献子类Article
英文摘要Zircon has long been recognized as the best geochronometer and the most important timekeeper in geosciences. Modern microbeam techniques such as SIMS and LA-ICPMS have been successfully applied to in situ U-Pb zircon age determinations, at spatial resolutions of 20-30 mu m or less. Matrix-matched calibration by external standardization of well-characterized natural zircon references is a principal requirement for precise microbeam U-Pb zircon age determination due to fractionation effects between Pb and U, which usually result in an external age error exceeding 1%. Alternatively, zircons with a closed U-Pb system can be directly dated by measurement of (207)Pb/(206)Pb isotopic ratio without external standardization, which has been a common practice for zircons older than 1.0 Ga, but not for relatively young (< 1.0 Ga and particularly Phanerozoic) ones because of limitations of analytical precision. We describe in this paper a method of (207)Pb/(206)Pb measurement on Phanerozoic zircons using a new generation of large radius magnetic sector multicollector Cameca IMS-1280 SIMS. In combination with multicollector mode, a Nuclear Magnetic Resonance (NMR) magnet controller and oxygen flooding techniques, we achieve precisions of (207)Pb/(206)Pb ratio of < 0.1% and 0.1 similar to 0.2%, propagating to Pb/Pb age errors < 0.4% and 1 - 3% (excluding U decay constant uncertainties), for zircons of latest Neoproterozoic and late Paleozoic to Mesozoic age, respectively. Therefore, the multicollector SIMS is capable of direct determination of zircon Pb/Pb ages as young as Mesozoic age with uncertainties of geological significance. This technique is useful for direct dating of zircons in thin sections. Moreover, it has significance for dating of some other U-rich minerals (i.e., baddeleyite and zirconolite) that are not suitable for SIMS U-Pb dating by external standardization.
WOS关键词U-TH-PB ; ION-MICROPROBE ; DECAY CONSTANTS ; TRACE-ELEMENT ; GEOCHRONOLOGY ; EVOLUTION ; ABLATION ; HF ; BADDELEYITE ; ISOTOPES
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000265101000001
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China(40773007 ; National Natural Science Foundation of China(40773007 ; Institute of Geology and Geophysics, Chinese Academy of Sciences(ZC0801) ; Institute of Geology and Geophysics, Chinese Academy of Sciences(ZC0801) ; 40873045) ; 40873045) ; National Natural Science Foundation of China(40773007 ; National Natural Science Foundation of China(40773007 ; Institute of Geology and Geophysics, Chinese Academy of Sciences(ZC0801) ; Institute of Geology and Geophysics, Chinese Academy of Sciences(ZC0801) ; 40873045) ; 40873045) ; National Natural Science Foundation of China(40773007 ; National Natural Science Foundation of China(40773007 ; Institute of Geology and Geophysics, Chinese Academy of Sciences(ZC0801) ; Institute of Geology and Geophysics, Chinese Academy of Sciences(ZC0801) ; 40873045) ; 40873045) ; National Natural Science Foundation of China(40773007 ; National Natural Science Foundation of China(40773007 ; Institute of Geology and Geophysics, Chinese Academy of Sciences(ZC0801) ; Institute of Geology and Geophysics, Chinese Academy of Sciences(ZC0801) ; 40873045) ; 40873045)
源URL[http://ir.iggcas.ac.cn/handle/132A11/70538]  
专题中国科学院地质与地球物理研究所
通讯作者Li, Xian-Hua
作者单位1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA
推荐引用方式
GB/T 7714		 Li, Xian-Hua,Liu, Yu,Li, Qiu-Li,et al. Precise determination of Phanerozoic zircon Pb/Pb age by multicollector SIMS without external standardization[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2009,10.
APA Li, Xian-Hua,Liu, Yu,Li, Qiu-Li,Guo, Chun-Hua,&Chamberlain, Kevin R..(2009).Precise determination of Phanerozoic zircon Pb/Pb age by multicollector SIMS without external standardization.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,10.
MLA Li, Xian-Hua,et al."Precise determination of Phanerozoic zircon Pb/Pb age by multicollector SIMS without external standardization".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 10(2009).

入库方式： OAI收割

来源：地质与地球物理研究所

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