| 中国沉积变质型铀矿床矿化特征和成矿条件探讨 |
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| 引用本文： | 郑自先.中国沉积变质型铀矿床矿化特征和成矿条件探讨[J].铀矿地质,1986(2). |
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| 作者姓名： | 郑自先 |
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| 摘 要： | 我国沉积变质型铀矿床主要产在华北地台的太古界、元古界的变质岩系中,都在古老基底剥蚀面之上,有花岗岩侵入或混合岩化。古地理环境为滨海-浅海相中近古海岸线的基底洼地。矿化特点因地段不同而异:远离花岗岩地段,矿体呈似层状,与地层产状基本一致,受层位、岩性控制,铀矿物是沥青铀矿,粒度小,沿层理定向排列;近花岗岩外接触带或混合岩化地段为巢状矿体,铀矿物是晶质铀矿,粒度大,呈脉状、网脉状产出。与国外澳北区铀矿床相比,两者基本相似,但我国铀矿化分布空间大,形成时间长,无盖层。矿床形成过程为:沉积阶段形成了富铀
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A TANTATIVE DISCUSSION ON THE MINERALIZATION CHARACTERISTICS AND MINEROGENETIC CONDITIONS OF METASEDIMENTARY URANIUM DEPOSITS IN CHINA |
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| Zheng Zixian.A TANTATIVE DISCUSSION ON THE MINERALIZATION CHARACTERISTICS AND MINEROGENETIC CONDITIONS OF METASEDIMENTARY URANIUM DEPOSITS IN CHINA[J].Uranium Geology,1986(2). |
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| Authors: | Zheng Zixian |
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| Institution: | Zheng Zixian |
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| Abstract: | Metasedimentary uranium deposits in Chna occur chiefly in Archaean and Proterozoic quartzites from Northern China Platform, in which intrusion of granite or migmatization took place and they are located aboye the surface of denudation of the old basement. The palaeogeographic environment of formation of the uranium deposits is in the basement depression of littoral-epicontinental facies near palaeo-coastal line. The mineralization characteristics are variable with different locations in northern China where the uranium deposits lie. Uranium ore bodies far from granite occur as stratoid, which are essentially conformable with the occurrence of strata and are controlled by strata and lithologies. The primary uraniom mineral is pitchblende with fine grains and arranges in orientation along the stratification) The uranium ore bodies in the outer contact zone near granite or nlgmatlzed area occur as nested. The primary uranium mineral is uraninite with coarse grains, occurring as veins and stockworks. In comparison with the uranium deposits in Northern Australia, both are essentially similar. But the uranium deposits in China are widely distributed in space and long in time of formation, and no covers have been found. With reference to the formation of the deposits, U-rich strata were formed in the sedimentary process; Strata of uranium mineralization were formed in the regional metamorphic process. Economic uranium deposits were formed after previous U-bearing formations suffered from thermometamorphism caused by migmatization or iutrusion of granite and enrichment of uranium followed by modification. |
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| Keywords: | Metasedimentary uranium deposit Mineralization characteristics Minerogenetic conditions |
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