ESR and CL Observed in Quartz Grains from Uranium Deposits: Implications for Uranium Migration in Natural Hydrogeological Environments
ESR and CL Observed in Quartz Grains from Uranium Deposits: Implications for Uranium Migration in Natural Hydrogeological Environments
复制标题
在铀矿床石英颗粒中观察到的 ESR 和 CL：对自然水文地质环境中铀迁移的影响
DOI：
10.1524/ract.1998.82.special-issue.331
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发表时间：
1998
影响因子：
1.8
通讯作者：
H. Yoshida
中科院分区：
文献类型：
--
作者：
S. Toyoda;K. Komuro;K. Sato;M. Ikeya;H. Yoshida
石英中的晶格缺陷是在地质时期积累的，同时也是由放射性元素的自然辐射产生的。 ESR（电子自旋共振）检测石英中的氧空位作为 E' 中心（氧空位处的不成对电子）的信号。该方法与 CL（阴极发光）一起用于调查津巴布韦 Kanyemba 铀矿床中铀的过去迁移情况。铀浓度较高的岩心样品中 ESR 信号强度较大，其中也观察到了 CL 边缘。 ESR 强度绘制为根据当前 U、Th 和 K 浓度估计的自然辐射剂量率的函数，由两条线组成。如果将这些线解释为两条等时线，则铀迁移的年龄是砂岩年龄的 2%，最年轻为 5 Ma。
Lattice defects in quartz are accumulated through geologic time while being created by natural radiation from radioactive elements. ESR (electron spin resonance) detects oxygen vacancies in quartz as a signal of the E' center (an unpaired electron at an oxygen vacancy). This method was employed together with CL (cathode luminescence) to investigate the past migration of uranium at the Kanyemba uranium deposit, Zimbabwe. ESR signal intensities are larger in core samples with higher uranium concentrations, in which CL rims are also observed. The ESR intensities, plotted as a function of natural radiation dose rates estimated from the present U, Th, and Κ concentrations, consist of two lines. If the lines are interpreted as two isochrons, the age of the uranium migration is 2% of that age of the sandstone, as young as 5 Ma.
影响因子：
0.8
作者：
S. Toyoda;M. Ikeya
通讯作者：
S. Toyoda;M. Ikeya