| 粤北地区302矿床沥青铀矿的形成时代、地球化学特征及其成因研究 |
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| 引用本文：尹征平,凌洪飞,邓平,朱捌,沈渭洲.2010.Formation age, geochemical characteristics and genesis of pitchblende from No.302 uranium deposit in northern Guangdong [J].Mineral Deposits,29(2):352~360 |
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| 基金项目:全国危机矿山接替资源找矿专项(200544040)、核工业地质局“十一五”基础科研项目(南京大学)及教育部科学研究重大项目(306007) |
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| 中文摘要:302铀矿床位于诸广山岩体东南部，是中国花岗岩型铀矿床中规模较大 、埋藏较深的矿床。研究表明，沥青铀矿的U_Pb和Sm_Nd等时线年龄分别为(68.7±2.7) Ma和(70±11) Ma，与华南花岗岩型铀矿床的主成矿期一致。沥青铀矿低的εNd(t)值(-11.3～-13.1)、古老的Nd模式年龄(1.76～1.88 Ga) 以及它们的微量元素和稀土元素组成都与赋矿围岩油洞岩体，尤其长江岩体十分相似，表明铀源可能主要来源于赋矿 花岗岩体，尤其是长江岩体。 |
| 中文关键词:地质学 沥青铀矿 U-Pb和Sm-Nd等时线年龄 Nd模式年龄 铀矿床 粤北 |
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| Formation age, geochemical characteristics and genesis of pitchblende from No.302 uranium deposit in northern Guangdong |
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| Abstract:No. 302 uranium deposit, located in the southern part of Zhuguangshan composite granite body, is the largest uranium deposit of granitic type in China and has evident vertical zoning. U-Pb and Sm-Nd isochron dating of pitchblendes from the deposit yields reference ages of （68.7±2.7） Ma and（70±11）Ma, respectively. These two ages are consistent with the main formation period of uranium deposits of granitic type in South China. Low values of εNd(t) (-11.3 ～ -13.1) and old Nd model ages (1.76～1.88 Ga) of the pitchblendes are very similar to data of the host granite bodies (Changjiang and Youdong). Trace and rare earth element characteristics are also similar to those of the granites. All these indicate that uranium of the ore deposit might have been derived from the host granites, especially from the Changjiang granite. |
| keywords:geology,pitchblende, U-Pb and Sm-Nd isochron age, Nd model age, uranium deposit, northern Guangdong |
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