陕西蓝田铀矿田控矿因素与成矿作用过程探讨
Discussion on Ore-Control Factors and Mineralization of the Lantian Uranium Field,Shaanxi
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摘要: 蓝田铀矿田是我国第一个进行地下堆浸开采的铀矿田,笔者对其控矿因素进行了系统研究:空间上位于古近—新近系断陷盆地边缘,多期多阶段的岩浆活动,北北东向断裂与北东向复合断裂以及矿区内出露大量的基性岩脉是主要控矿因素。其成矿过程主要分为五个阶段:①牧护关岩体第二次主侵入体的形成。②多期多阶段的岩浆活动使岩体中的铀预富集。③伴随基性岩脉涌入的地幔流体使岩体副矿物中的铀活化释放,并且为铀的迁移提供了丰富的矿化剂∑CO2。④以铀酰碳酸络阴离子的形式运移的铀在适宜的物理化学条件下沉淀富集成矿,⑤潜水氧化淋滤改造叠加成矿作用。Abstract: This paper studies the ore-control factors of the Lantian uranium field,which is the firstunderground leaching exploitation in China. The main ore-control factors locating in the margin of fault basin include multiple magmatic activity,compound faults of NNE & NE and mass mafic dikes of the field. The mineralization process includes 5 stages. ① The formation of theγ52-2;②The preenrichment of U caused by the multiple magmatic activity;③ Alkali-alternation caused by mantle fluid activate the uranium of the accessory minerals,and the mantle fluid provide abundant ∑CO2;④Uranium which is moved as UO2(CO3)O34-deposit in right physic-chemical circumstance and ⑤The phase of overprinting and reworked mineralization of oxidation and leaching.
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Key words:
- ore-control factors /
- mineralization /
- mafic dikes /
- mantle fluid /
- Lantian uranium field
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