| 我国西北地区盐湖中的铀234U/238U比值示踪研究 |
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| 引用本文： | 韩军,郝伟林,王志明,叶传永,林效彬,金贵善.我国西北地区盐湖中的铀234U/238U比值示踪研究[J].地质学报,2013,87(9):1447-1460. |
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| 作者姓名： | 韩军 郝伟林 王志明 叶传永 林效彬 金贵善 |
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| 作者单位： | 核工业北京地质研究院 |
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| 摘 要： | 内蒙古二连盆地、鄂尔多斯盆地典型含铀碳酸型盐湖水、岩两相234U/238U综合分析表明，碳酸型盐湖铀来源于大气降水和潜水对盐湖盆地周围中生代到现代富铀沉积物的溶滤、浸出，具有快速、近源物质来源特点。盐湖卤水和对应沉积物234U/238U值一般为0.8～1.2，湖卤水和潜卤水（晶间卤水）-岩两相中的铀处于沉积平衡状态。早白垩世～上新世含膏盐地层对比研究证实了富铀岩层234U/238U值随铀含量增大而减小，并趋近于1。室内盐湖水蒸发模拟实验发现残余卤水、沉积物234U/238U具有随蒸发程度增大逐渐减小的变化特征。盐湖现代沉积物物相研究发现铀主要以碳酸铀酰和吸附形式赋存在富含有机物和碎屑成分的含盐粘土沉积中，铀在盐类晶体中含量极少，仅存在于封闭水和结晶水中。卤水和沉积物ARu值是盐湖铀源及铀含量水平的指示标志之一。
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| 关 键 词： | 碳酸盐型盐湖 234U/238U 水岩两相 铀 |
| 收稿时间： | 5/1/2013 12:00:00 AM |
| 修稿时间： | 2013/7/21 0:00:00 |
Studies on 234U/238U of Saline Lakes in the North Western of China |
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| HAN Jun,HAO Weilin,WANG Zhiming,YE Chuanyong,LIN Xiaobin and JIN Guishan.Studies on 234U/238U of Saline Lakes in the North Western of China[J].Acta Geologica Sinica,2013,87(9):1447-1460. |
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| Authors: | HAN Jun HAO Weilin WANG Zhiming YE Chuanyong LIN Xiaobin and JIN Guishan |
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| Institution: | beijing research institute of uranium geology |
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| Abstract: | Through integrated researches on saline lake water and response sediments of uranium-bearing carbonate-type lakes in Erlian basin and Erdos Basin in the west of china, the authors refers that uranium in carbonate-type lakes resourced from surrounding Mesozoic and Neozoic sediments leaching by meteoric and underground water, with which the characteristics of near and fast recharge uranium resources. The 234U/238U (ARu) of lake brine and response sediments fall in range from 0.8 to 1.2 what inclined uranium equilibrium between brine and sediments. Rich uranium content lowered ARu value tending to 1 in gypsum and salt stratum of early carbonaceous and Miocene sediments. In-chamber lake water evaporation experiment verified both relic water and sediments enrich uranium and its ARu value refers to 1 in accordance to increased amplitude of evaporation. Material phase researches of modern lake sediments revealed the majority of uranium conserved in sediments rich of organic and detritus components yet seldom in salt occurrence as the type of carbonate and absorption sealed in inter-crystal water. ARu of both lake brine and sediments are as one of key proxy to pursue the uranium content and resources for saline lake-type uranium resource. |
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