NDLI: Qinghu zircon: A working reference for microbeam analysis of U-Pb age and Hf and O isotopes

Content Provider	Springer Nature Link
Author	Li, XianHua Tang, GuoQiang Gong, Bing Yang, YueHeng Hou, KeJun Hu, ZhaoChu Li, QiuLi Liu, Yu Li, WuXian
Copyright Year	2013
Abstract	Zircon is the most useful mineral for studies in U-Pb geochronology and Hf and O isotope geochemistry. Matrix effect is a major problem of the microbeam techniques such as SIMS and LA-(MC)-ICPMS. Therefore, external standardization using well-characterized natural zircon standards is fundamental for accurate microbeam measurements. While the isotopic geochronology and geochemistry laboratories equipped with microbeam analytical facilities have been increasingly established in China during the past decade, applications of the isotopic microanalysis are still limited due to shortage of available standards. We report here the Qinghu zircon as a potential new working reference for microbeam analysis of zircon U-Pb age and O-Hf isotopes. This zircon was separated from the Qinghu quartz monzonite from the western Nanling Range, Southeast China. It is fairly homogeneous in U-Pb age and Hf and O isotopes in terms of large amounts of mircobeam measurements by LA-MC-ICPMS and SIMS at the scales of 20–60 μm. SIMS measurements yield consistent $^{206}$Pb/$^{238}$U age within analytical uncertainties with that obtained by ID-TIMS. Precise determinations of O isotopes by IRMS and Hf isotopes by solution MC-ICPMS are in good agreement with the statistical mean of microbeam measurements. We recommend U-Pb age of = 159.5 ± 0.2 Ma (2SE), δ $^{18}$O = 5.4‰± 0.2‰ (2SD) and $^{176}$Hf/$^{177}$Hf = 0.283002 ± 0.000004 (2SD) as the best reference values for the Qinghu zircon.
Starting Page	4647
Ending Page	4654
Page Count	8
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	58
Issue Number	36
e-ISSN	18619541
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-11-24
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Qinghu zircon standard U-Pb age O and Hf isotopes SIMS LA-MC-ICPMS Science, Humanities and Social Sciences, multidisciplinary Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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