粤北地区塘湾矿床物化探特征与成矿规律研究  

Study on Geophysical and Geochemical Characteristics and Metallogenic Regularity of Tangwan Deposit in Northern Guangdong

作　　者：邱际玮 赵佳楠 QIU Jiwei;ZHAO Jia'nan(291 Brigade of Guangdong Province Nuclear Industry Geological Bureau)

机构地区：[1]广东省核工业地质局二九一大队

出　　处：《现代矿业》2023年第12期56-60,64,共6页Modern Mining

基　　金：中国地质调查局发展研究中心(自然资源部矿产勘查技术指导中心)项目(编号:121201004000150017-65,121201004000160901-77,121201004000172201-61);中央财政资金项目(编号:DD20190159-10);乡村振兴战略省级财政专项资金地质矿产勘查及环境治理专项(编号:任务书[2018]-009)。

摘　　要：为研究粤北地区诸广山南部铀多金属矿整装勘查区成矿规律,预测找矿靶区,以塘湾矿床为研究对象,通过地球物理勘探、地球化学勘探、地质调查与钻探工程等工作手段,分析粤北地区塘湾矿床的物化探特征和“三位一体”铀矿床成矿规律,为实现粤北地区铀矿找矿突破提供技术支撑与理论依据。研究认为,塘湾矿床位于布格重力异常过渡带且具正磁异常,并存在铀异常晕和氧化钾异常晕,表明具有优越的铀元素富集成矿条件;塘湾矿床成矿地质体主要为161.9~154.0Ma具高钾过铝质钙碱性产铀花岗岩地球化学特征的粗中粒斑状二云母花岗岩;成矿构造主要为塘湾硅化断裂带与城口硅化断裂带,成矿结构面主要为断裂交会地段或断裂构造界面;成矿特征标志为含铀粗中粒斑状二云母花岗岩中“中心硅化、紧邻钾化、围岩绢云母化”的蚀变分带特征,为构建“三位一体”找矿预测地质模型提供理论依据。In order to study the metallogenic regularity of the integrated exploration area of uranium polymetallic deposits in the south of Zhuguangshan in northern Guangdong and predict the prospecting target area,Tangwan deposit is taken as the research object.Through geophysical exploration,geochemical exploration,geological survey and drilling engineering,the geophysical and geochemical characteristics of Tangwan deposit in northern Guangdong and the metallogenic regularity of′trinity′uranium deposit are analyzed,which provides technical support and theoretical basis for the breakthrough of uranium prospecting in northern Guangdong.The study shows that the Tangwan deposit is located in the transition zone of Bouguer gravity anomaly and has positive magnetic anomaly,and there are uranium anomaly halo and potassium oxide anomaly halo,indicating that it has superior uranium enrichment and mineralization conditions.The ore-forming geological body of Tangwan deposit is mainly 161.9~154.0 Ma coarse-medium grained porphyritic two-mica granite with geochemical characteristics of high-potassium peraluminous calc-alkaline uranium-producing granite.The ore-forming structure is mainly Tangwan silicified fault zone and Chengkou silicified fault zone,and the ore-forming structural plane is mainly the fault intersection section or the fault structure interface.The ore-forming characteristics are characterized by the alteration zoning characteristics of′central silicification,adjacent potassic alteration,and wall rock sericitization′in the uranium-bearing coarse medium-grained porphyritic two-mica granite,which provides a theoretical basis for the construction of the′trinity′prospecting prediction geological model.

关 键 词：铀矿 物化探 “三位一体”找矿理论 成矿规律 

分 类 号：P618.2[天文地球—矿床学]