| 中国南方红盆区铀矿床成矿模式探讨 |
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| 引用本文： | 汪昌亮,徐萍.中国南方红盆区铀矿床成矿模式探讨[J].矿产与地质,2016(2):188-192. |
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| 作者姓名： | 汪昌亮 徐萍 |
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| 作者单位： | 1. 保利矿业投资有限公司,北京,100010;2. 江苏省有色金属华东地质勘查局,江苏 南京,210007 |
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| 摘 要： | 在分析我国华南地区铀矿床成矿背景的基础上,根据前人提出的铀成矿模式,对该地区花岗岩型和火山岩型铀矿床的铀源、成矿时间以及铀矿床与白垩纪―第三纪红盆在时间和空间上的关系进行了综合研究,认为:华南地区花岗岩型和火山岩型铀矿床的铀源主要来自于地壳表层,在白垩纪―第三纪干热、强氧化的环境下,富铀地质体遭受风化剥蚀,铀元素受到氧化作用价态升高,并在地表水的作用下发生迁移,含铀流体沿白垩纪-第三纪地壳伸展背景下形成的断裂下渗,在有利于铀还原沉淀的部位成矿。华南地区已知的热液型铀矿床大部分分布在红盆的周边,白垩纪―第三纪红盆基底中分布的隐伏花岗岩、火山岩具有与红盆周边已知铀矿床相同的成矿地质条件,具有找到大型铀矿的潜力。
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| 关 键 词： | 铀矿 红色盆地 铀源 成矿模式 |
Metallogenic model of uranium deposits in red basin area of Southern China |
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| Abstract: | Based on the analysis of mineralization background of uranium deposits in Southern China and the metallogenic model of uranium summarized by the predecessors,this paper conducted a comprehensive study on the uranium source and mineralization period of granitic and volcanic uranium deposits as well as the time and space relationship between the uranium deposits and cretaceous-tertiary red basin.It appears that the uranium source of granitic and volcanic uranium deposits comes from the upper layer of the earth crust. Under the circumstance of dry,hot and strong oxidization in cretaceous-tertiary period,uranium-rich geologic body suffers from weathering and denudation.The valence state of uranium element is increased because of the effect of oxidization and the uranium migrates under the influence of surface water.The ura-nium-bearing fluid infiltrate along the fractures formed in the setting of cretaceous-tertiary crustal extension and then is mineralized at the spots which are favorable for reduction and precipitation of uranium.Known hydrothermal uranium deposits in Southern China are wildly distributed in the peripheral area of red basin, and the concealed granite and volcanic rocks in the basement of cretaceous-tertiary red basin have the same metallogenic conditions that the known uranium deposit on the periphery of red basin have.It appears that the area in which intrusive granite and volcanic rocks occur have a potential of prospecting for large scale ura-nium deposits. |
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| Keywords: | uranium deposit red basin uranium source metallogenic model |
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