| 中国铀地球化学块体与远景区划分 |
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| 引用本文：徐善法,王学求,张必敏,王玮,迟清华,周建,严桃桃.2020.中国铀地球化学块体与远景区划分[J].地球学报,41(6):785-796. |
| DOI：10.3975/cagsb.2020.082502 |
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| 基金项目:国家重点研发计划项目第九课题(编号: 2016YFC0600609);中国地质调查局地质调查项目“化学地球基准与调查评价” (编号: DD20190450) |
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| 中文摘要:本文利用中国不同尺度水系沉积物地球化学填图数据, 以10 km×10 km的网格为基础, 按1:100万比例尺进行了数据计算。地球化学数据统计显示, 以秦岭—大别山为界, 中国南北地区铀含量值存在明显差异。以铀含量中位数(累计频率50%)作为背景值, 全国背景值为2.3×10–6、南方为2.9×10–6、北方为2.1×10–6。考虑南北地区铀表生风化和富集或贫化程度差异, 以累计频率85%作为异常下限, 对应南方地区含量值4.8×10–6、北方地区含量值3.0×10–6做为地球化学异常下限, 共圈出面积大于1000 km2, 且具有明显异常浓集中心的地球化学块体共79处。在结合前人研究成果的基础上, 对铀地球化学块体及异常特征、矿床分布、地质特征进行研究, 最终圈定出铀矿找矿远景区33处, 并以四个主要铀矿床类型分别对33个远景区进行了适当的讨论。 |
| 中文关键词:铀矿 地球化学块体 远景区 |
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| China’s Uranium Geochemical Blocks: Implications for Delineation of Uranium Prospective Areas |
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| Abstract:In this study, the authors collected geochemical data from stream sediment surveys of different scales and calculated the data based on a grid of 10 km by 10 km at the scale of 1:1 million in China. The statistic data show that geochemical background values are different in North China and South China separated by the boundary line of Qinling–Dabie mountains. Midian values of uranium in whole China, South and North China are 2.3 μg/g, 2.9 μg/g and 2.1 μg/g respectively. A total of 79 geochemical blocks with an area more than 1000 km2 were delineated by a threshold value of 4.8 μg/g for South China and 3.0 μg/g for North China based on cumulative frequency of 85%. Among the 79 geochemical blocks, 33 uranium prospective areas were delineated for four types of major uranium deposits in combination with the data of uranium metallogeny and geology obtained by other researchers. |
| keywords:uranium geochemical block prospective area |
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