ZHANG Xin1,2, NIE Feng-jun1,2*, ZHANG Shu-ming1, ZHANG Cheng-yong1, YANG Yan-bo1, QIAO Hai-ming3, LIU Zhi-guo3, WU Qun3
(1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;
2. College of Earth Sciences, East China Institute of Technology, Nanchang 330013, China;
3. No. 203 Institute of Nuclear Industry, Xianyang 712000, China)
Abstract: The study area is in the southwestern margin of the Tuha Basin in which dozens of sandstone-type uranium deposits (occurrences) have been recently discovered with uranium bodies mainly occurred in the Xishanyao Formation, Shuixigou Group of the Middle Jurassic ages. In this paper, we have systematically analyzed Pb isotopes and trace elements of 10 sandstone samples from the ore-bearing layer and 20 granitoid samples from the provenance area in the southern margin of the Tuha Basin and have calculated related parameters of Pb isotopes. The results show that the 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios of the granitoid and sandstone samples in the southern margin range from 16.364 to19.216, from 15.482 to15.820, and from 37.184 to 39.082, respectively, with relatively large ranges of variation and characteristics of radioactive anomalous Pb. On the whole, the Pb is mainly sourced from the upper crust, with minor from the mantle. The granite and sandstone, which were pre-enriched in uranium, could have provided important uranium source for the later sandstone-type uranium mineralization in the area.
Keywords: the eastern Tianshan; Tuha basin; Pb isotope; provenance
ACTA MINERALOGICA SINICA Vol. 39, No.2, 2019, page 201-210
