Origin of gray-green sandstone in ore bed of sandstone type uranium deposit in north Ordos Basin |
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| Authors: | Li ZiYing Fang XiHeng Chen AnPing Ou GuangXi Xiao XinJian Sun Ye Liu ChiYang Wang Yi |
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| Institution: | 1.Beijing Research Institute of Uranium Geology,Beijing,China;2.Geological Party No.208,CNNC,Baotou,China;3.Department of Geology,Northwest University,Xi’an,China;4.Research Institute of Petroleum Exploration and Development,Sinopec,Beijing,China |
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| Abstract: | Dongsheng sandstone-type uranium deposit is located in the northern part of Ordos Basin, occurring in the transitional zones between gray-green and gray sandstones of Jurassic Zhiluo Formation. Sandstones in oxidized zone of the ore bed look gray-green, being of unique signature and different from one of ordinary inter-layered oxidation zone of sandstone-type uranium deposits. The character and origin of gray-green sandstones are systematically studied through their petrology, mineralogy and geochemistry. It is pointed out that this color of sandstones is originated from secondary oil-gas reduction processes after paleo-oxidation, being due to acicular-leaf chlorite covering surfaces of the sandstone grains. To find out the origin of gray-green sandstone and recognize paleo-oxidation zones in the ore bed are of not only theoretical significance for understanding metallogenesis of this kind of sandstone-type uranium deposit, but also very importantly practical significance for prospecting for similar kind of sandstone-type uranium deposit. |
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