Interim report task 2: performance testing- task 2.4: natural mineral analog studies performance and chemical characteristics of brannerite in natural systems to Lawrence Livermore National Laboratory for Contract B345772

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dc.contributor.authorLumpkin, GRen_AU
dc.contributor.authorColella, Men_AU
dc.contributor.authorLeung SHFen_AU
dc.date.accessioned2023-11-08T04:19:19Zen_AU
dc.date.available2023-11-08T04:19:19Zen_AU
dc.date.issued2000-04-30en_AU
dc.date.statistics2023-05-31en_AU
dc.description.abstractTo investigate the long-term alteration behavior of brannerite, we have undertaken a study of 13 natural samples from various geological environments, including granites, granitic pegmatites, quartz veins, and placer deposits. Literature data and U-Th-Pb chemical dating carried out in this work indicate that the samples range in age from approximately 20 Ma to 1580 Ma. Where independent age data or estimates are available for comparison, the U-Th-Pb chemical ages are in reasonable agreement for the younger samples, but the older samples tend to show evidence for Pb loss (up to about 80%), a common feature of metamict Nb, Ta, and Ti oxide minerals. Our results show that many of the samples exhibit only minor alteration, usually within small patches, microfractures, or around the rims of the brannerite crystals. Other samples consist of variable amounts of unaltered and altered brannerite. Heavily altered samples may contain anatase and thorite as fine-grained alteration products. Certain samples exhibited fracturing of the associated rock matrix or mineral phase in the immediate vicinity of the brannerite grains. These fractures contain U bearing material and indicate that some U migrated locally from the source brannerite.en_AU
dc.identifier.citationLumpkin, G. R., Colella, M., & Leung, S. H. F. (2000). Interim report task 2: performance testing- task 2.4: natural mineral analog studies performance and chemical characteristics of brannerite in natural systems to Lawrence Livermore National Laboratory for Contract B345772 (No. UCRL-CR-139066). Lawrence Livermore National Lab.(LLNL), Livermore, CA (United States). doi:10.2172/15007414en_AU
dc.identifier.otherUCRL-CR-139066en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15179en_AU
dc.language.isoenen_AU
dc.publisherUS Department of Energy (DOE)en_AU
dc.relation.ispartofserieshttps://doi.org/10.2172/15007414en_AU
dc.relation.urihttps://doi.org/10.2172/15007414en_AU
dc.subjectGranitesen_AU
dc.subjectBranneriteen_AU
dc.subjectChemistryen_AU
dc.subjectCrystalsen_AU
dc.subjectQuartzen_AU
dc.subjectAge estimationen_AU
dc.titleInterim report task 2: performance testing- task 2.4: natural mineral analog studies performance and chemical characteristics of brannerite in natural systems to Lawrence Livermore National Laboratory for Contract B345772en_AU
dc.typeExternal Reporten_AU
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