期刊
CHEMICAL GEOLOGY
卷 261, 期 1-2, 页码 31-41出版社
ELSEVIER
DOI: 10.1016/j.chemgeo.2008.09.009
关键词
Ion microprobe; Oxygen isotopes; Zircon; Moon
资金
- Australian Research Council [DP0211706]
- government of Western Australia
- research councils of Denmark, Norway and Sweden
- Geological Survey of Finland
- Swedish Museum of Natural History
- Australian Research Council [DP0211706] Funding Source: Australian Research Council
Ninety-seven high precision, high spatial-resolution ion microprobe analyses of oxygen isotopes in a single, large zircon crystal from a lunar soil sample yield a surprising and unexpectedly large range in delta O-18(SMOW) from 4.5 to 9.2 parts per thousand. Detailed consideration of sample mounting, polishing, and sample-standard orientation suggests that this variation was caused by analytical artefact(s) degrading the accuracy of delta O-18 values. Careful control of these parameters effectively eliminated the variation and the two most reliable sets of analyses, obtained when the sample and standard were mounted within 2 turn in the centre of the mount, yield a combined weighted average delta O-18(SMOW) value of 5.70 +/- 0.07 parts per thousand (95% confidence). This value is indistinguishable from bulk rock analyses of low-Ti lunar basalts and suggests that, at least under anhydrous conditions, there is minimal fractionation accompanying zircon crystallisation. (C) 2008 Elsevier B.V. All rights reserved.
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