| 罗强,郑国栋,钟福军,韦昌鑫.粤北陂头花岗岩体外带型铀成矿地质特征及找矿潜力分析[J].矿产勘查,2026,17(3):458-468 |
| 粤北陂头花岗岩体外带型铀成矿地质特征及找矿潜力分析 |
| Analysis of geological characteristics and prospecting potential of external zone-type uranium mineralization in the Pitou Granite, northern Guangdong |
| 投稿时间：2025-09-05 |
| DOI：10.20008/j.kckc.202603003 |
| 中文关键词: 花岗岩体外带型铀矿 成矿地质特征 找矿潜力 陂头岩体 粤北 |
| 英文关键词: granite external zone-type uranium mineralization geological characteristics of mineralization prospecting potential Pitou granite northern Guangdong |
| 基金项目:本文受中国核工业地质局项目(202440、202440-1、202440-2)资助。 |
|
| 摘要点击次数: 74 |
| 全文下载次数: 25 |
| 中文摘要: |
| 花岗岩体外带型铀矿系指产于花岗岩体与地层接触带附近的铀矿化，是花岗岩型铀矿的重要亚类。近年来，在粤北陂头岩体外接触带的李庄地区发现一批花岗岩外带型铀矿，为总结外带型铀矿成矿特征，为华南花岗岩体外带型铀矿勘查提供借鉴。本文在野外地质调查的基础上，结合室内岩相学与矿物学分析，总结了该地区外带型铀成矿地质特征，探讨了铀矿找矿潜力，提出了勘查工程部署方向。研究认为，研究区外带型铀矿主要受陂头岩体接触带附近寒武系与李庄帚状构造控制，在断裂带膨胀收缩及分支复合部位铀矿化更好，围岩蚀变主要有赤铁矿化、褐铁矿化、硅化与绿泥石化。铀矿石呈碎块构造和碎裂结构，铀矿物以次生的镁铀云母为主，推测其由原生的沥青铀矿在后期表生氧化条件下蚀变形成。综合地质与物化探异常特征，认为岩体与地层接触带及招坑断裂次级构造的深部是寻找原生铀矿体的有利部位，建议作为下一步勘查工作的重点靶区。 |
| 英文摘要: |
| Granite external zone-type uranium deposits refer to uranium mineralization occurring near the con-tact zone between granite bodies and strata, and they are an important subclass of granite-type uranium deposits. Inrecent years, a batch of granite periphery-type uranium deposits have been discovered in the Lizhuang area at the outer contact zone of the Pitou granite in northern Guangdong. To summarize the metallogenic characteristics of ex-ternal zone-type uranium mineralization and provide references for the exploration of external zone-type uraniumdeposits in granite massifs in South China. Based on field geological investigations and combined with indoor petro-graphic and mineralogical analyses, this paper summarizes the geological characteristics of external zone-type ura-nium mineralization in this area, explores the uranium prospecting potential, and proposes the direction of explora-tion engineering deployment. The study suggests that the external zone-type uranium deposits in the study area aremainly controlled by the contact zone of the Pitou granite body and the Cambrian strata and the Lizhuang fault zone.Uranium mineralization is better in the expansion and contraction as well as the branching and combination parts ofthe fault zone. The wall rock alteration mainly includes hematitization, limonitization, silicification and chloritiza-tion. The uranium ore has a fragmented texture and a shattered structure. The primary uranium mineral is secondarySaleeite, which is inferred to have formed from the alteration of primary pitchblende under medium-low temperaturehydrothermal conditions followed by supergene oxidation. Integrating geological, geophysical, and geochemicalanomaly characteristics, the deep sections of the contact zone between the rock body and strata, as well as the sec-ondary structures of the Zhaokeng fault, are identified as favorable targets for locating primary uranium ore bodies.These areas are recommended as priority targets for the next phase of exploration work. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|