Genesis and Uranium Sources of Leucogranite-hosted Uranium Deposits in the Gaudeanmus Area, Central Damara Belt, Namibia: Study of Element and Nd Isotope Geochemistry
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We are most grateful to AGS reviewers Hongfei Ling and Kenneth Ashton as well as Associate Editor Guoxiang Chi for critical and constructive comments that greatly improved the manuscript. We also appreciate Professor Jiashu Rong from Beijing Research Institute of Uranium Geology for many fruitful discussions and suggestions. This study was supported by the National Natural Science Foundation of China (41602080) and Nuclear Energy Development Project from the National Defense Science and Industry Bureau.

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    Abstract:

    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 SiO2 (68.8wt%–76.0wt%, average 73.1wt%) and K (4.05wt%–7.78wt%, average 5.94wt%) 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 εNd(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 post-orogenic 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.

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FAN Honghai, CHEN Jinyong, WANG Shengyun, ZHAO Jingyang, GU Dazhao, MENG Yanning.2017. Genesis and Uranium Sources of Leucogranite-hosted Uranium Deposits in the Gaudeanmus Area, Central Damara Belt, Namibia: Study of Element and Nd Isotope Geochemistry[J]. Acta Geologica Sinica(),91(6):2126-2137

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History
  • Received:July 01,2016
  • Revised:August 01,2017
  • Adopted:
  • Online: December 22,2017
  • Published: