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下庄铀矿田是华东南铀成矿省重要的铀资源基地，前人研究多聚焦于岩体内硅化带型、交点型和碎裂蚀变岩型铀矿化，而对于岩体外接触带型铀矿化的研究相对薄弱。近年来，核工业二九〇研究所在下庄铀矿田花岗岩体与寒武系接触带部位取得找矿新发现，连续揭露到多段富厚工业矿段，表明“接触带”具有较大的找矿潜力。文章在地质调查、岩心编录和室内镜下观察的基础上，分析了下庄铀矿田岩体外接触带的成矿条件、矿化特征、控矿因素和成矿潜力。研究认为，矿体在接触带附近的岩体、地层中均可产出，对岩性的选择不大，但都产于接触界面两侧的一定范围内，空间分布与鹿井大型铀矿床“三层楼”式相似，且铀矿体具有分布范围广、厚度大、品位高的特点。外接触带型铀矿化严格受“断裂构造、接触带、岩性界面、热液蚀变”四位一体控制，定位于北北东向区域导矿、控矿断裂切穿岩体和地层接触带部位。该部位岩体往外突出的拐点地段是下一步铀矿勘查的优先区域，是下庄矿田边深部铀资源扩大的重点方向之一，各拐点之间的有利部位可继续加大探索，扩大找矿空间。
Abstract：Xiazhuang uranium ore field is an important uranium resource base in Southeast China. Previous studies have being mainly focused on silicified zone-type, intersection-type, and cataclastic altered rock-type uranium mineralization within granitic bodies, limited attention was paid to exocontact-type uranium deposits outside the granites. In recent years research and exploration, several rich and thick uranium ore section has been exposed by the drilling conducted by Research Institute No. 290 in the contact zone between the granitic body and Cambrian strata in the Xiazhuang ore field, indicating the significant prospecting potential in the “contact zone”. Based on geological surveys, core logging, and laboratory microscopic observations, this paper analyzed the uranium metallogenic conditions, mineralization characteristics, ore-controlling factors, and metallogenic potential of the exocontact zone of granitic bodies in Xiazhuang uranium ore field. It was concluded that ore bodies can occur in both the pluton and strata near the contact zone, showing little lithological selectivity but within a certain range to contact interface. Their spatial distribution is similar to the “three-story” model of the Lujing large uranium deposit, with uranium ore bodies featuring wide distribution, large thickness, and high grade. Exocontact-type uranium mineralization is strictly controlled by the “four-in-one” combination of fault structures, contact zones, lithological interfaces, and hydrothermal alteration, positioned at the place where NNE-trending regional ore-conducting and ore-controlling faults cut through the contact zone between the pluton and strata. The inflection points of the contact zone where the pluton protrudes outward into the strata is the priority sector for next uranium explorationt in the deep and periphery Xiazhuang uranium ore field.
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基本信息:
中图分类号:P619.14
引用信息:
[1]郑国栋,罗强,李俊,等.粤北下庄铀矿田外接触带型铀矿找矿新发现及勘查建议[J].铀矿地质,2025,41(06):972-987.
基金信息:
中国核工业地质局铀矿勘查项目（编号：202239、202439-2）;中国核工业地质局生产中科研项目（编号：202439-6）; 国家自然科学基金项目（编号：42362011）联合资助