Fixation of radionuclides in the 238U decay series in the vicinity of mineralized zones: 1. The Austatom Uranium Prospect, Northern Territory, Australia
Fixation of radionuclides in the 238U decay series in the vicinity of mineralized zones: 1. The Austatom Uranium Prospect, Northern Territory, Australia
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矿化带附近 238U 衰变系列中放射性核素的固定： 1. 澳大利亚北领地 Austatom 铀矿勘探区
DOI：
10.1016/0016-7037(83)90263-6
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发表时间：
1983
影响因子：
5
通讯作者：
P. Shirvington
中科院分区：
文献类型：
--
作者：
P. Shirvington
位于澳大利亚Alligator Rivers地区Austatom前景的次生铀矿化带的最小年龄估计为3.6 × 105年。这是来自一个地质年代学模型的基础上延迟浸出的234铀相对于238铀和比值在矿石中的这些成员的238铀衰变系列。尽管高岭石是风化片岩母岩中的主要矿物，但234 U的延迟溶解仅在粘土矿物伊利石和蒙脱石存在时发生。如果没有，则相反。提出了一个模型来解释结果。~（230）Th/~（238）U比值表明，矿化作用在风化片岩中保持稳定的时间至少为1 ~ 2 × 105年。未来使用粘土矿物作为缓冲剂在放射性废物处置库的支持下，得到了良好的长期保留氧化铀，可能部分是由于同晶取代到粘土晶格。
The minimum age of a zone of secondary uranium mineralization, located at the Austatom Prospect in the Alligator Rivers region of Australia, is estimated to be 3.6 × 105y. This is derived from a geochronological model based on retarded leaching of234U with respect to238U and on ratios within the ore of these members of the238U decay series. Although kaolinite is a dominant mineral in the weathered schist-host-rocks, retarded dissolution of234U occurs only in the presence of the clay minerals illite and montmorillonite. In their absence the reverse occurs. A model is proposed to explain the results. Ratios of230Th to238U indicate that the mineralization has probably remained stationary within the weathered schist for at least 1 to 2 × 105y. Future use of clay minerals as buffers in radioactive waste repositories is supported by the excellent long-term retention obtained for oxidized uranium, probably due in part to isomorphic substitution into the clay crystal lattice.