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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 δ 18 O SMOW from 4.5 to 9.2‰. Detailed consideration of sample mounting, polishing, and sample-standard orientation suggests that this variation was caused by analytical artefact(s)...
Hydrothermally intergrown xenotime-monazite from an episyenite in the Bohus granite, southwest Sweden, has been analyzed in situ by ion microprobe. Although the analysed xenotime crystals are extremely small, sometimes less than the ion beam diameter (~17 μm), they retain relatively undisturbed U-Pb systems, which yielded a 206 Pb/ 238 U age of 252+/-8 Ma. The evolution...
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