| 顾大钊,许志斌,范洪海,王生云,陈金勇.纳米比亚不同类型铀矿床成因初探[J].矿产勘查,2015,6(4):471-477 |
| 纳米比亚不同类型铀矿床成因初探 |
| Discussion of deposit genesis of different types of uranium deposits in Namibia |
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| DOI： |
| 中文关键词: 纳米比亚 铀矿床 矿床成因 |
| 英文关键词: uranium deposits, deposit genesis, Namibia |
| 基金项目: |
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| 中文摘要: |
| 纳米比亚的铀矿床主要有3种类型:侵入岩(白岗岩、伟晶岩)型、表生型(钙结岩型)、砂岩型(层控型)。矿床成因主要有两种类型,产于侵入岩中的白岗岩及伟晶岩型铀矿床,主要形成于岩浆的结晶分异与后期的热液叠加改造；产于钙结岩及沉积岩中的铀矿床,主要形成于新近纪富铀岩体中铀的活化转移,由于气候变化等原因铀富集成矿,后期的氧化作用形成次生铀矿物。 |
| 英文摘要: |
| Uranium deposits of Namibia are classified into three basic types:intrusive type (alaskites and pegmatite associated with plutonic rocks), hypergene type (calcium cemented) and sandstone type (strata-bound). The deposit genesis of uranium deposits mainly are two types. The first type of uranium deposit occurs in the alaskite and pegmatitein plutonic rocks, the uranium mineralization was formed by fractional crystallization of magma and superimposed by later stage of hydrothermal process. The second type is the uranium deposits occurring in calcrete and sedimentary rocks which were formed by the active transition of uranium from uranium-bearing host rocks during Neogene period, then enriched due to climate change. The later oxidation process results in the formation of the secondary uranium mineral. |
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