华南地区热液铀矿床成矿潜力的构造扩散模型研究  

Tectonic Diffusion Modeling for Metallogenic Potential of Hydrothermal Uranium Deposits in South China

作　　者：翁宗翔 谭凯旋 段先哲 谢焱石 韩世礼 杨月平 李咏梅 宋静 WENG Zongxiang;TAN Kaixuan;DUAN Xianzhe;XIE Yanshi;HAN Shii;YANG Yueping;LI Yongmei;SONG Jing(School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,Hunan,China;Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes,Hengyang 421001,Hunan,China)

机构地区：[1]南华大学资源环境与安全工程学院,湖南衡阳421001 [2]稀有金属矿产开发与废物地质处置技术湖南省重点实验室,湖南衡阳421001

出　　处：《大地构造与成矿学》2023年第4期801-809,共9页Geotectonica et Metallogenia

基　　金：湖南省产业发展专项科研类项目(2015JMH01-Z03);湖南省教育厅科学研究项目(18C0460)联合资助。

摘　　要：华南地区是我国重要的铀成矿区,特别是中新生代强烈的岩浆活动形成了众多的花岗岩型和火山岩型等热液铀矿床。本文运用构造扩散模型对华南地区花岗岩型铀矿床和火山岩型铀矿床的潜在资源量进行了分析与评估。构造模型从地壳构造运动的角度出发,引入折返速率、侵蚀速率、矿床形成速率等参数,利用矿床的年龄‒频率分布以及形成深度来模拟U元素在地壳中的迁移,从而预测矿床的资源量。研究结果表明,华南地区具有潜在的热液铀矿床总数约459个,其中近地表约86个,0.5~1 km深处约348个,1~2 km深处约25个。铀矿床主要集中在0.5~1 km深度,占矿床总数的75.8%,其潜在花岗岩型和火山岩型热液铀矿总资源量达到数十万吨。该区还有较好的铀矿找矿潜力,大多数矿床被剥蚀至地壳深度2 km以内,并且集中在地壳0.5~1 km深度内,应当要加强深部铀成矿理论研究与找矿工作。South China is an important uranium metallogenic area in China,especially the hydrothermal uranium deposits such as granitic type and volcanic type uranium deposits,which are genetically related to the Mesozoic and Cenozoic magmatic activities.In this study,the resource potential of the granitic type and volcanic type hydrothermal uranium deposits in South China were estimated by using tectonic diffusion model.This model utilizes the exhumation rate,erosion rate,deposit formation rate from the perspective of geotectonic movement,and simulates the migration of uranium in the crust using age distribution and formation depths of ore deposits to predict ore resources.The results show that there are likely 459 undiscovered potential hydrothermal uranium deposits in South China,including 86 near the surface,348 at the depth of 0.5 to 1 km,and 25 at the depth of 1 to 2 km.Uranium deposits are mainly concentrated at depth of 0.5 to 1 km,accounting for 75.8%of the total deposits.The total resources of these potential granitic type and volcanic type hydrothermal uranium deposits can be up to hundreds of thousands tons.It shows that there are great uranium prospecting potential in this area,most of the deposits lie within depth of 2 km,and concentrated in the shallow part(0.5 to 1 km)of the crust,so it is necessary to conduct further theoretical uranium metallogenic study and prospecting work.

关 键 词：热液铀矿 构造扩散 铀矿资源潜力 华南地区 

分 类 号：P613[天文地球—矿床学]