| Citation: |
LI Xide, LIU Jungang, YI Chao. The genesis of uranium ore with red alterations in the Nalinggou deposit, northeastern Ordos Basin, and its geological implications[J]. Geological Bulletin of China, 2017, 36(4): 511-519.
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The genesis of uranium ore with red alterations in the Nalinggou deposit, northeastern Ordos Basin, and its geological implications
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Abstract
The large-sized Nalinggou sandstone type uranium deposit was recently discovered in northeastern Ordos Basin. Distinctly different from the typical uranium deposits of interlayer oxidation zone type in the world, this deposit is characterized not only by the tabular or stratoid orebodies controlled by the interface between monolayer grayish green paleo-oxidized sand body and underling gray sand body but also by being far away from the roof and bottom plate. Part of the ore-hosting rocks appear macroscopically as reddish and charcoal debris-bearing ores and microscopically as special paragenetic mineral assemblages consisting of coffinite, hematite (goethite), pyrite and siderite. Based on the results of rock-mineral identifications, EMPA and acidolysis hydro-carbon decomposition analysis, combined with the results of the experiments and mathematic simulations for fluid barrier theory of uranium metallogenesis by former researcher, the authors hold that the Nalinggou uranium deposit resulted from interaction between oxidizing uraniferous brine and deep-seated reducing fluid and, furthermore, the changing of the oxidizing-reducing inter-face in the ore-forming process was the key factor for reddish alteration of ores, and the interactions between persistent strong oxi-dizing uraniferous fluid and weak deep-seated reducing fluid might have been the primary factor responsible for the formation of the tabular orebodies.
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References
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LI Xide, LIU Jungang, YI Chao. The genesis of uranium ore with red alterations in the Nalinggou deposit, northeastern Ordos Basin, and its geological implications[J]. Geological Bulletin of China, 2017, 36(4): 511-519.
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Figure 1.
Geological section along No. 16 exploration line in the Nalinggou uranium deposit
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Figure 2.
The ore with red alteration in the Nalinggou uranium deposit
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Figure 图版Ⅰ.
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Figure 3.
The EDS image and EPMA image of uranium minerals
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Figure 4.
The SEM image of uranium minerals
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Figure 5.
The comparison of methane δ13C values in different types of sandstones from the Nalinggou uranium deposit
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Figure 6.
The component analyses of acidolysis hydrocarbon in sandstones of Zhiluo Formation from the Nalinggou uranium deposit
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Figure 7.
The alteration periods and new mineral products of the Nalinggou uranium deposit
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Figure 8.
The theoretic calculation of precipitation-reduction range of certain elements in natural water
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Figure 9.
The ideal cross section of roll uranium deposits
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Figure 10.
The simulation and experimental results of fluid-barrier uranium mineralization
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Figure 11.
The relation between hydrodynamic interface state and flow ratio of two interactional fluid systems