Uranium micro-isotopic analysis of weathered rock by a sensitive high resolution ion microprobe (SHRIMP II)

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dc.contributor.authorSato, Ten_AU
dc.contributor.authorYanase, Nen_AU
dc.contributor.authorWilliams, ISen_AU
dc.contributor.authorCompston, Wen_AU
dc.contributor.authorZaw, Men_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorAirey, PLen_AU
dc.date.accessioned2025-12-01T06:53:50Zen_AU
dc.date.available2025-12-01T06:53:50Zen_AU
dc.date.issued1998en_AU
dc.date.statistics2025-09-10en_AU
dc.descriptionPhysical copy held by ANSTO Library at DDC: 577.277/31.en_AU
dc.description.abstractThe SHRIMP II was used to measure the 234U/238U isotope ratios in weathered rock from the Koongarra uranium (U) deposit in Northern Australia. The results were compared with data obtained using sequential extraction (SE) procedures. The key attribute of the SHRIMP measurement is that sensitive isotopic data can be obtained without dissolution of the sample, and associated loss of textural relationships. The SHRIMP provides spot- by-spot isotopic ratios in individual mineral phases, and has not been previously applied to measurements of 234U/238U ratios. The SHRIMP measurements of 234U/238U activity ratios in the accumulated iron (Fe)-materials were closer to unity than in the chemically extracted amorphous Fe-oxide fraction, the primitive phase of all Fe-minerals. This indicates an approach to secular equilibrium subsequent to the deposition of U with the amorphous precursor phases. The activity ratios of 234U/238U in kaolinite were significantly lower than the ratios obtained for residual mineral phases in the SE study, although being higher than unity. This suggests that the extremely high 234U/238U ratio of the residual phase in the SE study was mainly derived from other minerals, presumably the abundant quartz rather than the kaolinite. Activity ratios exceeding unity were found in all kaolinites studied, regardless of their proximity to U-rich phases and grain boundaries. Individually, the SE procedure and SHRIMP analysis are useful techniques for measuring isotopes within mineral phases. However, in contrast to the SHRIMP, the SE procedure does not provide spatial or textural information, and quantifies isotopes in individual extractable fractions. On the other hand, the SHRIMP is not suitable for phases with very small gram size or low U content. By the parallel use of SE procedures and the SHRIMP, samples can be analyzed both quantitatively and with high spatial resolution. ©1998 R. Oldenbourg Verlag.en_AU
dc.identifier.booktitleChemistry and migration behaviour of actinides and fission products in the geosphere : proceedings of the sixth International Conference, Sendai (Japan), 26-31 October 1997en_AU
dc.identifier.citationSato, T., Yanase, N., Williams, I. S., Compston, W., Zaw, M., Payne, T. E., & Airey, P. L. (1998). Uranium micro-isotopic analysis of weathered rock by a sensitive high resolution ion microprobe (SHRIMP II). Paper presented to Chemistry and migration behaviour of actinides and fission products in the geosphere : proceedings of the sixth International Conference, Sendai (Japan), 26-31 October 1997.Radiochimica Acta, 82(s1), 335–340. https://doi.org/doi:10.1524/ract.1998.82.special-issue.335en_AU
dc.identifier.conferenceenddate1997-10-31en_AU
dc.identifier.conferencenameChemistry and migration behaviour of actinides and fission products in the geosphere : sixth International Conferenceen_AU
dc.identifier.conferenceplaceSendai, Japanen_AU
dc.identifier.conferencestartdate1997-10-26en_AU
dc.identifier.isbn9783486642650en_AU
dc.identifier.issn0033-8230en_AU
dc.identifier.issues1en_AU
dc.identifier.journaltitleRadiochimica Actaen_AU
dc.identifier.pagination335-340en_AU
dc.identifier.placeofpublicationMünchen, Germanyen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16749en_AU
dc.identifier.volume82en_AU
dc.language.isoenen_AU
dc.publisherR. Oldenbourg Verlagen_AU
dc.relation.urihttps://doi.org/doi:10.1524/ract.1998.82.special-issue.335en_AU
dc.subjectUraniumen_AU
dc.subjectWeatheringen_AU
dc.subjectRocksen_AU
dc.subjectIon Microscopesen_AU
dc.subjectUranium 234en_AU
dc.subjectUranium 238en_AU
dc.subjectNorthern Territoryen_AU
dc.subjectAustraliaen_AU
dc.subjectUranium minesen_AU
dc.subjectIsotopesen_AU
dc.subjectGeochemical surveysen_AU
dc.subjectRadioactive wastesen_AU
dc.titleUranium micro-isotopic analysis of weathered rock by a sensitive high resolution ion microprobe (SHRIMP II)en_AU
dc.typeConference Paperen_AU
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