摘要
独松地区位于南岭桃山—诸广铀成矿带,成矿地质背景优越。区内发育多期次花岗岩,其中燕山早期第3阶段中细粒二云母二长花岗岩为区内富铀岩体;区内发育断裂为近SN、NEE向断裂,其中NEE向F11、F9为含矿构造,物化探异常晕圈主要呈团块状、带状分布其在NEE向断裂带上。通过野外地质调查、岩相学、α径迹蚀刻、扫描电镜和电子探针等分析,系统研究了独松地区的铀矿化特征,划分了该区的构造与热液蚀变期次,总结了铀控矿因素。矿体主要赋存于NEE向F11断裂带内,赋矿岩性包括碎裂云煌岩、硅化云煌岩及碎裂花岗岩。铀矿物以沥青铀矿、铀石为主,成矿作用分为热液成矿期和表生氧化期,热液成矿期形成铀-微晶石英-赤铁矿和铀-赤铁矿两种重要的矿物组合类型。NEE向构造发育3期热液蚀变活动。铀矿化主要发育在两期岩体接触界面上下盘0~100 m范围内,并伴随有强硅化、强赤铁矿化。控矿因素主要包括NEE向F11断裂、云煌岩脉、岩体接触界面及围岩蚀变,其中NEE向F11断裂与云煌岩脉为主要控矿因素,近矿围岩蚀变对矿化起富集作用。
The Dusong area is located in the Taoshan-Zhuguang uranium metallogenic belt within the Nanling region,characterized by favorable uranium metallogenic geological settings.Multiple phases of granite have developed in the area,among which the early Yanshanian third-stage medium-to fine-grained two-mica monzogranite constitutes the uranium-rich rock body.The faults developed in the area are primarily oriented nearly SN and NEE.Among these,the NEE-trending F11 and F9 faults are ore-bearing structures.Geochemical and geophysical anomaly halos are mainly distributed as clusters and bands along the NEE-trending fault zones.Through field geological surveys,petrographic analysis,α-track etching,scanning electron microscopy,and electron probe microanalysis,a systematic study was conducted on the uranium mineralization characteristics of the Dusong area.The tectonic phases and hydrothermal alterations in the area were delineated,and the ore-controlling factors for uranium were summarized.Ore bodies are primarily hosted within the NEE-trending F11 fault zone,with ore-bearing lithologies including cataclastic lamprophyre,silicified lamprophyre,and cataclastic granite.Uranium minerals are mainly pitchblende and coffinite.The mineralization process can be divided into a hydrothermal mineralization period and a supergene oxidation period.During the hydrothermal mineralization period,two important mineral association types were formed:uranium-microcrystalline quartz-hematite and uranium-hematite.The NEE-trending structures underwent three stages of hydrothermal alteration.Uranium mineralization mainly occurs within 0-100 m of the hanging wall and footwall of the contact interface between two phases of rock bodies,accompanied by strong silicification and strong hematitization.The ore-controlling factors mainly include the NEE-trending F11 fault,lamprophyre dikes,rock contact interfaces,and wall-rock alterations.Among these,the NEE trending F11 fault and lamprophyre dikes are the primary ore-controlling factors,while near-ore wall-rock alterations play a significant role in enriching the mineralization.
作者
陈随
欧阳平宁
王前林
李鲲
陈峰
CHEN Sui;OUYANG Pingning;WANG Qianlin;LI Kun;CHEN Feng(Research Institute No.230,CNNC,Changsha 410007,China;Hunan Provincial Engineering Technology Research Center for Evaluation and Comprehensive Utilization of Associated Radioactive Mineral Resources,Changsha 410007,China)
出处
《世界核地质科学》
2026年第1期37-52,共16页
World Nuclear Geoscience
基金
中国核工业地质局铀矿地质项目(编号:201930-1)资助。
关键词
地质特征
铀矿化特征
控矿因素
独松地区
geological characteristics
uranium mineralization characteristics
ore-controlling factors
Dusong area
