粤北仙石铀矿床的铅、碳、硫同位素研究

粤北仙石铀矿床的铅、碳、硫同位素研究

叶海敏1 2, 沈渭洲1, 凌洪飞1, 邓平3, 濮巍1, 谭正中3

1. 南京大学,内生金属矿床成矿机制研究国家重点实验室,地球科学系,南京, 210093; 2. 南京地质矿产研究所,南京, 210016; 3. 核工业290研究所,韶关, 512026

收稿日期:2005-06-20 修回日期:2005-06-20 出版日期:2005-06-20 发布日期:2005-06-20

Lead,Carbon and Sulfur Isotopic Compositions of the Xianshi Uranium Deposit,Northern Guangdong Province

YE Hai-min1 2, SHEN Wei-zhou1, LING Hong-fei1, DENG Ping3, PU Wei1, TAN Zheng-zhong3

1. State Key Laboratory of Mineral Deposit Research and, Department of Earth Sciences, Nanjing University, Nanjing 210093, China; 2. Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China; 3. Research Institute No.290, CNNC, Shaoguan 512026, China

Received:2005-06-20 Revised:2005-06-20 Online:2005-06-20 Published:2005-06-20

摘要/Abstract

摘要： 仙石铀矿床位于粤北贵东复式花岗岩体东部,矿体赋存于NWW向辉绿岩与NEE向硅化带交接部位。矿床中黄铁矿以富集放射成因铀铅为特征,3组比值分别为(^208Pb／^304Pb)．=18．756—23．883,(^207Pb／^304Pb)1=15．676～15．932,(^208Pb／^204Pb),=38．530—38．938,主要位于基底变质岩铅范围内；矿床中方解石δ^18C值为-8．5‰～-3．1‰,相似于地幔值((-5±2)‰)；黄铁矿δ^18C值为-10．1‰～-8．3‰,它与花岗岩中黄铁矿δ^18C值(-10．9‰--7．1‰)相似,而与辉绿岩中黄铁矿δ^18C值(-0．03‰～2．1‰)区别明显。上述同位素特征表明仙石铀矿床的成矿物质具多源特征。

Abstract: The Xianshi uranium deposit is located in the eastern part of the Guidong composite granite body．The uranium ore bodies occur in the intersection parts of the NWW-trending diabase dikes and the NEE-trending sillicification zones．The pyrite in the deposit is characterized by enrichment of radiogenetic uranium lead，(206Pb/204Pb)i= 18.756～23.883，(207Pb/204Pb)i= 15.676～15.932 and (208Pb/204Pb)i=38.530～38.938，main1y plotted in the range of the basement metamorphite lead．The calcite of uranium deposit hasδ13C values of –8.5～-3.1‰, which coincides with the mantle δ13C values(-5±2‰)．Theδ34S values of pyrite (-10.1～-8.3‰) is close to the δ34S values of pyrite in the granite (-10.9～-8.1‰) and markedly different from the δ34S values of pyrite in the diabase dike (-0.03～2.1‰)．Based on the lead，carbon and sulfur isotopic signatures．it is proposed that the ore-forming materials of the Xianshi uranium deposit display multiple．resourced characteristics．

叶海敏 , 沈渭洲, 凌洪飞, 邓平, 濮巍, 谭正中. 粤北仙石铀矿床的铅、碳、硫同位素研究[J]. J4.

YE Hai-min1 2, SHEN Wei-zhou1, LING Hong-fei1, DENG Ping3, PU Wei1, TAN Zheng-zhong3. Lead,Carbon and Sulfur Isotopic Compositions of the Xianshi Uranium Deposit,Northern Guangdong Province[J]. J4.