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Precise U–Pb and Pb–Pb dating of Phanerozoic baddeleyite by SIMS with oxygen flooding technique

Journal of analytical atomic spectrometry, 2010-01, Vol.25 (7), p.1107-1113 [Peer Reviewed Journal]

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Title:
Precise U–Pb and Pb–Pb dating of Phanerozoic baddeleyite by SIMS with oxygen flooding technique
Author: Li, Qiu-Li ; Li, Xian-Hua ; Liu, Yu ; Tang, Guo-Qiang ; Yang, Jing-Hui ; Zhu, Wei-Guang
Is Part Of: Journal of analytical atomic spectrometry, 2010-01, Vol.25 (7), p.1107-1113
Description: Baddeleyite has long been recognized as one of the most important U-bearing minerals for dating silica undersaturated igneous rocks. Age determination of baddeleyite calls for analysis within small volumes using high-resolution secondary ion mass spectrometry (SIMS) because of its minuscule grain size as well as potential altered domains or micro-inclusions. However, precise SIMS U-Pb dating has been hampered for baddeleyite owing to crystal orientation effects that bias Pb/U ratio measured in baddeleyite. In this study we carried out a series of tests of U-Pb and Pb-Pb measurements on Phanerozoic baddeleyite using a multi-collector Cameca 1280 IMS with oxygen flooding technique. Our results demonstrate that the oxygen flooding can not only enhance secondary Pb+ ion yield by a fact of 7 for baddeleyite, but also depress the baddeleyite U/Pb orientation effect down to [similar]2% (1 RSD). Therefore, Phanerozoic (as young as Cenozoic) baddeleyite can be precisely dated by SIMS Pb-Pb and/or U-Pb measurements with precision of 1-3% (2 RSE).
Language: English
Identifier: ISSN: 0267-9477
EISSN: 1364-5544
DOI: 10.1039/b923444f
Source: Alma/SFX Local Collection

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