粤北诸广岩体塘湾地区铀矿化特征及成因探讨  

Uranium Mineralization Characteristics and Genesis in Tangwan Area of Zhuguang Pluton,Northern Guangdong

作　　者：张宝俊 赖静 王志[2,3,4] ZHANG Baojun;LAI Jing;WANG Zhi(CNNC Guangdong Technology Co.,Ltd,Shaoguan,Guangdong 512029,China;Research institute No.290,CNNC,Shaoguan,Guangdong 512029,China;Guangdong Provincial Key Laboratory of Environmental Protection and Nuclear Radiation Tracking Research,Shaoguan,Guangdong 512029,China;Guangdong Provincial Engineering Technology Research Center of Radioactive Eco-environmental Protection,Shaoguan,Guangdong 512029,China)

机构地区：[1]中核广东科技有限公司,广东韶关512029 [2]核工业二九〇研究所,广东韶关512029 [3]广东省环境保护核辐射追踪研究重点实验室,广东韶关512029 [4]广东省放射性生态环境保护工程技术研究中心,广东韶关512029

出　　处：《铀矿地质》2021年第3期412-422,共11页Uranium Geology

基　　金：中国核工业地质局项目“广东省诸广矿集区铀矿资源调查评价与勘查”(编号:201926)资助。

摘　　要：塘湾地区是城口铀矿区内目前唯一有中型矿床的地区,通过2019年的勘查工作,发现其矿体往深部延伸稳定,并在矿床东部外围地段发现了新的矿体,矿床规模有望扩大到大型,但其研究程度不高。基于最新的勘探工作以及前人成果总结,系统阐述了塘湾地区的铀矿化特征,结合粤北花岗岩型铀矿成矿规律,认为塘湾岩体和三江口岩体是富铀、产铀岩体,能够为铀矿床的形成提供丰富的铀源;矿床含矿构造和控矿构造均为北东-北东东向城口断裂带,与长江矿区近南北向构造含矿具有显著的差异;塘湾地区矿床类型属(北东-北东东向)硅化带大脉亚型,形成于岩石圈拉张伸展的构造动力学背景之下,其深部存在异常热源,可能也是区内铀成矿的另一主要驱动力。同时,通过总结塘湾地区的一系列成矿模型参数,初步建立了的成矿模型,提出塘湾地区找矿空间较之相邻长江矿区仍停留在较浅的标高,深部仍具有较大的找矿潜力。研究结果对指导诸广南部地区的花岗岩型铀矿找矿方向和塘湾地区矿床规模扩大具有借鉴意义。Tangwan is the only area with medium-sized uranium deposit in Chengkou mining area.Through the exploration work in 2019,the ore body was founded extending to the deep stably,and new ore bodies were found in the eastern periphery of the deposit,which was expected to expand the deposit to a large one.Based on the latest exploration work in 2019 and previous achievements,By summarizing and analyzing the geological characteristics,metallogenic regularity of Tangwan area,both Tangwan and Sanjiangkou pluton were uranium-rich and uranium-producing,which can provide abundant uranium source for the formation of the deposit.The ore bearing structure and ore controlling structure of the deposit were NE-NEE trending Chengkou faults,which are significantly different from the nearly north-south striking faults in Changjiang area.Deposit in Tangwan area belongs to big silicified zone subtype,formed under extension tectonic background,and there was an abnormal heat source in the deep,which may also be another main dynamic force for uranium mineralization.Meanwhile,a metallogenic model was preliminarily established.According to model,the prospecting space in Tangwan area is still at a relatively shallow elevation compared with the adjacent Changjiang mining area,and there is great prospecting potential in the deep part.

关 键 词：矿床地质特征 铀源 铀成矿动力 成矿模型 塘湾地区 

分 类 号：P619.14[天文地球—矿床学] P612[天文地球—地质学]