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粤北仁化棉花坑铀矿床地下热水地球化学特征及补给来源研究
投稿时间:2018-07-14  修订日期:2018-12-13  点此下载全文
引用本文:祁家明,叶松鑫,方晓骐,曹豪杰,唐仕尧.2019.粤北仁化棉花坑铀矿床地下热水地球化学特征及补给来源研究[J].地质论评,65(1):199-210.
QI Jiaming,YE Songxin,FANG Xiaoqi,CAO Haojie,TANG Shiyao.2019.Study on Hydrogeochemical and Recharge Sources Characteristics of Geothermal Water in the Mianhuakeng Uranium Deposit,Renhua, Northern Guangdong[J].Geological Review,65(1):199-210.
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作者单位E-mail
祁家明 核工业二九〇研究所广东韶关512026 jiaming_qi@126.com 
叶松鑫 核工业二九〇研究所广东韶关512026 125382647@qq.com 
方晓骐 核工业二九〇研究所广东韶关512026  
曹豪杰 核工业二九〇研究所广东韶关512026  
唐仕尧 核工业二九〇研究所广东韶关512026  
基金项目:注: 本文为中国地质调查局“全国重要矿集区找矿预测”项目(编号:DD2016005209)、中核集团集中研发项目(编号:地LTD1602)及中国核工业地质局科研项目(编号:201486、201641)的成果。
中文摘要:通过对粤北仁化棉花坑铀矿床地下热水的水文地球化学及地热地质条件分析,探讨了地下热水的形成环境及补给源特征。棉花坑矿床地下热水为HCO3--Ca2+-Na+型水,其δDV-SMOW值为-44.5‰~-40.7‰,δ18OV-SMOW值为-6.8‰~-6.4‰,分布于本地雨水线附近,为大气降水成因;热储温度为67.8℃,补给源高程为650~1150m,循环深度为标高-1250~-660 m,d- excess值7.5‰~10.5‰,表明地下热水可更新能力较强,热水径流距离短,水—岩作用较弱;结合粤北花岗岩区地质地貌特征,认为补给源来自矿床东南向的南山一带;地下水深循环是形成矿区地热主因,同时岩体铀矿物放射性蜕变产热可增强地温梯度;地下热水铀含量为40~120μg/L,呈氧化环境,现今地下热水活动一定程度上继承了成矿期古热水活动特征,对铀矿床的形成具有促进作用;热水循环深度指示矿床深部仍具有非常好的找矿前景。
中文关键词:水化学、H—O同位素  地下热水  302铀矿床  广东仁化棉花坑
 
Study on Hydrogeochemical and Recharge Sources Characteristics of Geothermal Water in the Mianhuakeng Uranium Deposit,Renhua, Northern Guangdong
NameInstitution
QI JiamingResearch Institute No. 290, CNNC. Shaoguan, Guangdong, 512026
YE SongxinResearch Institute No. 290, CNNC. Shaoguan, Guangdong, 512026
FANG XiaoqiResearch Institute No. 290, CNNC. Shaoguan, Guangdong, 512026
CAO HaojieResearch Institute No. 290, CNNC. Shaoguan, Guangdong, 512026
TANG ShiyaoResearch Institute No. 290, CNNC. Shaoguan, Guangdong, 512026
Abstract:Objectives: The paper has discussed the formation environment and recharge source of geothermal water, based on the analysis of hydrogeochemical and geological conditions in the Mianhuakeng Uranium Deposit, Northern Guangdong. Methods: This paper was based on the methods of hydrochemical analysis, H—O isotope analysis and comprehensive study of water samples. Results: The geothermal water type was HCO3-—Ca2+—Na+, and δDV-SMOW ranged -44.5‰~-40.7‰, δ18OV-SMOW ranged -6.8‰~-6.4‰, distributed near the local rainwater line which was caused by atmospheric precipitation. The water had strong renewability, short runoff distance and weak water—rock effect, which thermal storage temperature was 67.8℃, recharge source altitude 650~1150 m, circulation depth altitude -1250~-660 m, and d- excess value ranged 7.5‰~10.5‰ The uranium content which was 40~120μg/L indicated that the geothermal water was formed in an oxidizing environment. Conclusions: The recharge source was come from Nanshan area which was located in southeast of the deposit, according to the geological and geomorphologic characteristics of granite area in northern Guangdong. The groundwater depth recycle was the main reason of geothermal formation. To some extent, the present geothermal water activity has inherited the characteristics of the paleo hot water during the metallogenic period, which had a promoting effect on the formation of uranium deposit. The depth recycle of the geothermal water has indicated that there was a very good prospecting potential in the depth of the deposit.
keywords:Hydrochemistry  H—O isotopes  Geothermal water  Uranium deposit No.302  Mianhuakeng, Renhua, North Guangdong
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