| 确定砂岩型铀矿矿化地段的铀、钍同位素证据 |
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| 引用本文：.1999.Uranium and Thorium isotopic evidence for determining mineralized sectors of the sandstone type Uranium deposit[J].Mineral Deposits,18(3):262~267 |
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| 基金项目:核能资源开放实验室资助项目(1995) |
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| 中文摘要:根据铀、钍同位素地球化学基本原理，对新疆伊犁盆地512矿床含矿砂岩的U、Th及其234U／238U、230Th／232Th进行了测试，并在此基础上对含矿砂岩的氧化带、还原带和氧化还原过渡带特征进行了研究。研究表明．与氧化带、还原带相比，氧化-还原过渡带具有较高U含量和234U/238U比值，较低Th/U比值；矿石样品中的234U/238U、230Th/238U比值位于过渡带范围内，234U/238U比值偏高区往往是过渡带分布区（铀沉淀区）。显然，含矿砂岩中的含量，Th/U、234U／238U和230Th／238U比值可以为判断砂岩型铀矿矿化地段位置提供重要依据。 |
| 中文关键词:层间氧化带 放射性同位素 同位素比值 砂岩型铀矿 新疆伊犁 |
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| Uranium and Thorium isotopic evidence for determining mineralized sectors of the sandstone type Uranium deposit |
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| Abstract:On the basis of the basic principle of uranium and thorium isotopic geochemistry, the author determined the U and Th content as well as 234U/238U, 230Th/232Th and 230Th/238U ratios of ore-bearing sandstone, and studied characteristics of the oxidation zone, the reduction zone and redox transition zone in No.512 deposit, Ili basin, Xinjiang. The results suggest that the uranium content and 234U/238U ratios ratios in the sandstone of the redox transition zone are generally higher than those of the oxidation and reduction zones, while the Th/U ratios of the transition zone are lower than Those in sandstone of the oxidation zone and the reduction zonc. 234U/238U and 230Th/238U ratios in uranium ore samples are in the range of their ratios in the redox transition zone. The high value areas of 234U/238U ratios are often consistent with the distribution areas (the uranium precipitation areas) of the transition zone. It is obvious that important evidence for locating mineralized sectors of the sandstone type uranium deposit may be provided by the U and Th content as well as Th/U, 234U/238U and 230Th/238Th ratios in the sandstone. |
| keywords:Interformational oxidation zone, radioactive isotope, isotopic radio, sandstone type uranium deposit, Ili of Xinjiang |
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