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The effect of relative measured position on zircon SIMS U-Pb dating
Ling XiaoXiao1; Li QiuLi1,2; Liu Yu1,2; Tang GuoQiang1,2; Li Jiao1
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:8Pages:2615-+
AbstractThe Secondary Ion Mass Spectrometry (SIMS) is normally considered as the first choice to reveal the age of complicate metamorphic zircon due to its high spatial resolution. It is very common to test the rim and the core of a metamorphic zircon grain at the same analytical session to investigate the metamorphic and protolith age, respectively. In order to evaluate the effect of relative measured position on SIMS U-Pb dating quantitatively, the most homogenous zircon reference material M257 was tested under four different situations: 1) testing U-Pb age of the zircon twice on the same spot, 2) analyzing 0 isotopes firstly and U-Pb dating secondly in the same pit, 3) bombing the up/down/left/right region relative to the first measured position with overlapped pre-sputter area successively, 4) detecting two spots on the same zircon grain with visible distance. The results showed that the depths of the bombardment and the pre-sputter area relative to the first measurement can cause obvious U-Pb data bias ranging from-5% to 11%. The maximum bias is recorded in the rear region relative to the direction of primary ion of the first measured spot with overlapped pre sputter area the rear. Cautions are suggested when setting the relative measured position on the same area. In addition, previous SIMS dating results on metamorphic zircon rims after measuring the zircon core should be re-evaluated. The time span of metamorphism could be extended without evaluation of the relative measured position effect.
KeywordSIMS Zircon U-Pb Age Measured position System bias
DOI10.18654/1000-0569/2019.08.17
WOS KeywordAGE-DETERMINATION ; MASS ; PB-207-PB-206 ; IONIZATION ; ISOTOPES
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000491158400017
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93882
Collection岩石圈演化国家重点实验室
Corresponding AuthorLi QiuLi
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Ling XiaoXiao,Li QiuLi,Liu Yu,et al. The effect of relative measured position on zircon SIMS U-Pb dating[J]. ACTA PETROLOGICA SINICA,2019,35(8):2615-+.
APA Ling XiaoXiao,Li QiuLi,Liu Yu,Tang GuoQiang,&Li Jiao.(2019).The effect of relative measured position on zircon SIMS U-Pb dating.ACTA PETROLOGICA SINICA,35(8),2615-+.
MLA Ling XiaoXiao,et al."The effect of relative measured position on zircon SIMS U-Pb dating".ACTA PETROLOGICA SINICA 35.8(2019):2615-+.
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