【作者】 叶海敏； 沈渭洲； 凌洪飞； 邓平； 濮巍； 王学成； 谭正中；

【Author】 YE Haimin SHEN Weizhou LING Hongfei DENG PingPU Wei WANG Xuecheng and TAN ZhengzhongState Key Laboratory of Mineral Deposit Research and.Department of Earth Sciences, Nanjing University. Nanjing 210093; Research Institute No.290,CNNC, Shaoguan 512026; Institute of Geology, Jiangsu Bureau of Geology and Mineral Resources, Nanjing 210018

【机构】 内生金属矿床成矿机制研究国家重点实验室南京大学,南京大学地球科学系； 核工业290研究所； 江苏省地质科学研究所；

【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,三组比值分别为(²⁰⁶Pb/²⁰⁴Pb)i=18.756～23.883,(²⁰⁷Pb/²⁰⁴Pb)i=15.676～15.932,(²⁰⁸Pb/²⁰⁴Pb)i=38.530～38.938,它们主要位于基底变质岩铅范围内;矿床中方解石δ¹³C值为-8.5～-3.1‰,相似于地幔值（-5±2‰）;黄铁矿δ³⁴S值为-10.1～-8.3‰,它与花岗岩中黄铁矿δ³⁴S值（-10.9～-8.1‰）相似,而与辉绿岩中黄铁矿δ³⁴S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。更多还原

【Abstract】 The Xianshi uranium deposit is located in the eastern part of the Guidong complex granite body. The uranium orebodies occur in the intersection part between 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 respectively, which are mainly located at the range of the basement metamorphite lead. The calcite of uranium deposit has δ 13C values of -8.5 ～ -3.1‰, which coincides with the mantle δ 13C values (-5±2‰). The δ 34S values of pyrite (-10.1 ～ -8.3‰) is closed to the δ 34S values of pyrite in the granite (-10.9 ～ -8.1‰) and markedly differ form the δ 34S values of pyrite in the diabase dike (-0.03～2.1‰). Based on the lead, carbon and sulfur isotopic signatures above, it is proposed that the ore-forming materials of the Xianshi uranium deposit display multiple-resourced characteristics.更多还原