维普中文期刊产品整合服务

Genesis and Uranium Sources of Leucogranite-hosted Uranium Deposits in the Gaudeanmus Area, Central Damara Belt, Namibia: Study of Element and Nd Isotope Geochemistry

查看全文 作　　者：FAN [1,2,3]Honghai;CHEN [1,2]Jinyong;WANG [1,2]Shengyun;ZHAO [1,2]Jingyang;GU [1,2]Dazhao;MENG [1,2]Yanning 高影响力作者 机构地区：[1]Beijing Research Institute of Uranium Geology;[2]Key Laboratory of Uranium Resource Exploration and Evaluation Technology,CNNC;[3]Department of Earth Sciences and State Key Lab of Mineral Deposit Research,Nanjing University高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2017年第91卷第6期,共12页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (41602080);Nuclear Energy Development Project from the National Defense Science and Industry Bureau 摘　　要：This paper presents a systematic study of major and trace elements and Sm-Nd isotopes in leucogranites closely related to uranium mineralization in the Gaudeanmus area, Namibia. The results illustrate that the uraniferous leucogranites possess high Si_O_2(68.8 wt%–76.0 wt%, average 73.1 wt%) and K(4.05 wt%–7.78 wt%, average 5.94 wt%) contents, and are sub-alkaline and metaluminous to weakly peraluminous, as reflected by A/CNK values of 0.96–1.07 with an average of 1.01. The leucogranites are rich in light rare earth elements(LREE/HREE = 2.53–7.71;(La/Yb)N = 2.14–10.40), have moderate Eu depletion and high Rb/Sr ratios(2.03–5.50 with an average of 4.36); meanwhile, they are enriched in Rb, K, Th, U and Pb, and depleted in Ba, Nb, Ta, and Sr. The ε_(Nd)(t) values of uraninites range from -14.8 to -16.5, and the two-stage Nd model ages are 2.43–2.56 Ga. Detailed elemental and Sm-Nd isotopic geochemical characteristics suggest that the leucogranites were formed in a postorogenic extensional environment. The U-rich pre-Damara basement was the main source of uranium during the primary mineralization event, which is disseminated in leucogranites, whereas the uranium mineralization in veins possibly resulted from remobilization of the primary uranium minerals. 关 键 词：铀 铀的来源 Nd 同位素 LEUCOGRANITES Gaudeanmus Damara 带
相关文献

参考文献(63)

引证文献(9)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费