Trace Element and REE Geochemical Characteristics of Sandstonetype  Uranium Deposit in the Dongsheng Area of the Ordos Basin，China

Abstract

Abstract:

This study examines the geochemical characteristics of the Dongsheng sandstonetype uranium deposit in the Ordos basin in order to find geochemical signals that are useful for uranium deposit exploration. Trace element analyses were carried out for uranium ores, uraniummineralized sandstones, and nonmineralized country rock (sandstones and shales). The results indicate that Pb and Mo have close relationships with uranium mineralization, with the highest concentrations in the uranium ores, then in the uraniummineralized sandstone, and lowest in country rocks. Therefore, Pb and Mo can be used as indicator elements for uranium mineralization. This is reflected by the “W” pattern (three peaks representing Pb, U and Mo) in the spider diagram. REE patterns suggest that the ores, mineralized sandstones and nonmineralized country rocks were initially formed from the same material sources, sedimentary environments and tectonic settings. The fact that some of the uranium ores are enriched in HREE relative to other uranium ores suggests two stages of uranium mineralization, a diagenetic stage overprinted by a hydrothermal mineralization.

Key words: Ordos basin, Dongsheng sandstonetype uranium deposit, trace elements, REE, geochemistry

CLC Number:

P619.4

XUE Wei, Xue-Chun-Ji, Chi-Guo-Xiang, Peng-Yun-Biao, WANG Kai. Trace Element and REE Geochemical Characteristics of Sandstonetype Uranium Deposit in the Dongsheng Area of the Ordos Basin，China[J]. Geoscience, 2010, 24(4): 776-784.

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Trace Element and REE Geochemical Characteristics of Sandstonetype Uranium Deposit in the Dongsheng Area of the Ordos Basin，China

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