Mechanism of Uranium Accumulation in the Kupferschiefer from Poland and Germany

Sun, Yuzhuang; Wang, Jinxi; Shi-feng, LI; Jin, Kankun; Lin, Min

doi:10.1260/014459805776986902

Cited by 12 publications

(7 citation statements)

References 8 publications

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“…Uranium minerals mainly contain uranium. There might be little of uraninite residual in this area, which suggested that the uranium is produced by weak base or under neutral-strong reductive environment (Sun et al, 2005). This is consistent with the test that reported organic matters contained a lot fatty acid methyl ester compound around this area in Zhiluo formation.…”

Section: The Generation Model Of Green Alteration and Bleaching Phenosupporting

confidence: 87%

Alteration Effects of Hydrocarbon Dissipation in the Dongsheng Uranium Deposit, Ordos Basin — Explanation for Green Alteration and Bleaching Phenomenon

Guo-wu²,

Liu

et al. 2009

Energy Exploration & Exploitation

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Obvious features of the Neopaleozoic natural gas dissipation have been known in the north part of the mid of Ordos Basin where the natural gas had concentrated. Because of mutual actions of the superficial blanket where the natural gas effused through the surrounding light ground, various reductive alterations were formed. Large scale of green-color alteration zone was formed in the Zhiluo formation of the north-easern basin, and bleaching phenomenon occurred on the top of the Yan'an formation. Studies have shown that green sandstone is molded by low organic carbon and sulfur, high ratio of Fe2+ / Fe3+ and Th / U (non-mineralized rock). Mineral containing abundant alkaline and reduced state of iron magnesium chlorite clay minerals is the internal cause of green. Fluid composition and carbon-sulfur isotope tests have shown that the fluid has the characteristics of organic matter (gas). From a geological point of view, green alteration containing oxidation rocks, residue can be seen with “tongue” or “roll-like” shape in interlayer oxidation zone. The bleached sandstones on the top of Yan'an Formation under Dongsheng deposit belt have low contents of iron, high ratio of Fe2+ / Fe3+ and Th / U. Minerals that contain abundant clay mineral kaolinite are the internal cause of white coloring. The study of fluid from Shanxi formation in north part of the basin indicated that the dissipative direction of natural gas was from south to north, and finally converged in northeastern part of the study area. Ultimately the gas leakage “window” formed in the Wulangeer paleohigh in northeast of the basin which was found to contain abundant oil seepages. Alteration zone located in the scale of hydrocarbon dissipation and closed to the leakage “window” region has a favorable reduction geochemical environment on the space. The time of hydrocarbon dissipation, alteration and uranium mineralization are consistent with the ages. Therefore the escaped hydrocarbon and its reductive alteration had a good coupling relation between time and space. According to the tests in the study area, high contents of aliphatic acid carbomethoxy compound were found in the organic material of uranium bearing sandstone of Zhiluo formation. Research has shown that they were formed by the reaction of dispersed Neopaleozoic natural gas and the groundwater solution containing uranylion. Similarly, the truth also proved that the north east part of Dongsheng area had experienced large-scale dissipative and reductive alteration effect caused by natural gas.

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Section: The Generation Model Of Green Alteration and Bleaching Phenosupporting

confidence: 87%

Alteration Effects of Hydrocarbon Dissipation in the Dongsheng Uranium Deposit, Ordos Basin — Explanation for Green Alteration and Bleaching Phenomenon

Guo-wu²,

Liu

et al. 2009

Energy Exploration & Exploitation

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“…The distribution and differentiation (loss or enrichment) of redox sensitive trace elements were predominantly controlled by their chemical property and ocean redox condition (Sun et al, 2005). Redox conditions in marine settings controlled the concentrations of redox sensitive trace elements in sediments and sedimentary rocks.…”

Section: Environmental Significancementioning

confidence: 99%

Paleoenvironment of Lower Silurian Black Shale and its Significance to the Potential of Shale Gas, Southeast of Chongqing, China

Guo

Jiang

Zhang

et al. 2011

Energy Exploration & Exploitation

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Black shale is studied because of its economic value, paleoclimatic and paleogeographic significance. Due intensive development southeast of Chongqing, Longmaxi black shale, characterized by thickness in excess of 100 m, is becoming a location of concentrated research interest for shale gas exploration in China. The paleoenvironment, mineral composition, elements and reservoir characteristics of black shale of the Lower Silurian Longmaxi formation southeast of Chongqing were obtained by cores, outcrops, slices analysis, X-ray diffraction and X-ray fluorescence spectrum. The results show that Longmaxi black shale, including turbidite and suspended sediment, is deposited primarily in deep water. The sum of SiO 2 , Al 2 O 3 and Fe 2 O 3 content ranges from 73.82% to 90.54% by weight; quartz, feldspar and clay minerals are the dominant minerals in the rocks, ranging from 56% to 100%. Trace element contents of Mo (7.71 µg/g) and U (5.97 µg/g) are higher than that of earth crust and mudstone, the indexes of the anoxic reducing environment in the Longmaxi stage in the study area. The relative sea level of the Lower Silurian Longmaxi period, which correlates to total organic carbon content, experienced two riseand-fall cycles; meanwhile, the reducibility of the ancient sea waters experienced a similar period of rise-and-fall cycles. Total organic carbon content is quite higher near the maximum flooding surface in study area. After mineral analysis, the reservoir property was found to be similar to the Ohio shale that provided the first commercial gas production in the United States, thereby inspiring and instructing shale gas exploration and exploitation southeast of Chongqing.

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“…However, helium is a product of alpha irradiation from the uranium, and would not be a product of beta irradiation from potassium. Deposits of the Permian Zechstein sea, from which the sylvite was precipitated, are anomalously enriched in uranium [27,28]. This is especially evident on the European continent, but is also evident in north-east England, where modern groundwaters through Zechstein-age rocks have relatively high uranium contents [29].…”

Section: Gas Compositionmentioning

confidence: 99%

Hydrogen from Radiolysis of Aqueous Fluid Inclusions during Diagenesis

Parnell

Blamey

2017

Minerals

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A suite of Permian sylvite samples from Boulby potash mine, Yorkshire, UK, consistently yield traces of hydrogen upon analysis by a cold crush technique for liberating volatiles from entrapped fluid inclusions. In contrast, accompanying halite samples do not yield hydrogen. These data suggest the formation of hydrogen by radiolysis of water due to irradiation from potassium in the sylvite. The data indicate radiolysis as a mechanism for subsurface hydrogen generation, where it is available as an electron donor for a deep biosphere.

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Mechanism of Uranium Accumulation in the Kupferschiefer from Poland and Germany

Cited by 12 publications

References 8 publications

Alteration Effects of Hydrocarbon Dissipation in the Dongsheng Uranium Deposit, Ordos Basin — Explanation for Green Alteration and Bleaching Phenomenon

Alteration Effects of Hydrocarbon Dissipation in the Dongsheng Uranium Deposit, Ordos Basin — Explanation for Green Alteration and Bleaching Phenomenon

Paleoenvironment of Lower Silurian Black Shale and its Significance to the Potential of Shale Gas, Southeast of Chongqing, China

Hydrogen from Radiolysis of Aqueous Fluid Inclusions during Diagenesis

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