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FS-ICPMS和TIMS联用法测定微粒铀矿物的年龄 总被引:1,自引:0,他引:1
A method for age dating of uranium mineral particles by double focusing magnetic sector inductively coupled mass spectrometry (FS-ICPMS) and thermal ionization mass spectrometry (TIMS) was presented. Pb/U ratio in uranium mineral particles was measured by FS-ICPMS without any chemical separation procedure. Pb isotope composition in uranium mineral particles was determined by TIMS associated with micro column anion exchange resin method. Due to simplified chemical procedure and minimum use of reagents, the full procedure blank was reduced to 230 pg Pb, leading to the successful age dating of uranium mineral particles with relative standard deviation less than 2%. 相似文献
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中国北方主要产铀盆地砂岩铀矿成矿年代学及成矿铀源研究 总被引:1,自引:0,他引:1
提出用铀矿石样品U Ra平衡系数修正样品的铀含量,再进行U Pb等时线拟合,从而获得北方主要产铀盆地更符合实际的成矿年龄。对含矿砂体中碎屑锆石与相应蚀源区中酸性火成岩类锆石U Pb同位素年龄的对比研究,证明了含矿砂体直接来自中酸性火成岩类的剥蚀,指出该物源是形成富铀砂体的物质基础。通过对蚀源区岩石和盆地含矿地层不同部位的砂体岩石样品的U Pb同位素体系演化特征的研究,论证了地浸型砂岩铀矿的铀源一是蚀源区活性铀高的中酸性火成岩类;另一铀源是有铀预富集的沉积砂体。 相似文献
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