An excellent fossil wood cell texture with primary uranium minerals at a sandstone-hosted roll-type uranium deposit, NW China

Min, Maozhong; Luo, Xianglong; Mao, Su-Jie; Wang, Z.-Q; Wang, R.C; Qin, Li; Tan, Xuehao

doi:10.1016/s0169-1368(00)00007-x

Cited by 42 publications

(8 citation statements)

References 8 publications

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“…Minerals detected by XRD in studied samples comprise quartz, albite, microcline, muscovite, kaolinite, and chamosite (Figure 3; Table 2). While uranium in the studied samples mainly occurrs as pitchblende and coffinite, in some cases, uranium is adsorbed by clay minerals and organic matters [17,25]. Pyrite, gypsum, and mixed-layer illite-smectite have also been identified by SEM and our previous study [13].…”

Section: Resultssupporting

confidence: 54%

Relationship between Chamosite Alteration and Fe-Plugging in Sandstone Pores during Acid In Situ Leaching of Uranium

Zhao

2021

Minerals

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Sandstone pore-plugging is a serious problem that bothers acid in situ leaching (ISL) uranium deposit, but currently, the mechanism of pore-plugging has not attracted much attention. In this study, using X-ray fluorescence, scanning electron microscope, optical microscope, and X-ray diffraction, we present both macro- and micro-evidence of pore-plugging occurred during acid in situ mining of sandstone uranium deposit at Yili Basin, NW (northwest) China. Our study reveals that in comparison with normal sandstones, the plugged sandstones are yellow in color and have relatively high contents of Fe and chamosite. The plugging in studied samples is mainly caused by precipitation of Fe(OH)3 at a pH of 2.0–4.0 for quantitative effect and by precipitation of gypsum (CaSO4·2H2O) as well. Alteration/dissolution of chamosite and to a lesser extent, Fe-bearing microcline and muscovite, may have contributed iron for Fe(OH)3 precipitation. It is suggested that adjustment of injection pH < 2.0 throughout the leaching passage would be an effective way to avoid/minimize this type of sandstone pore-plugging.

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Section: Resultssupporting

confidence: 54%

Relationship between Chamosite Alteration and Fe-Plugging in Sandstone Pores during Acid In Situ Leaching of Uranium

Zhao

2021

Minerals

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“…The geological characteristics and metallogenic mechanisms of the sandstone type uranium ore deposit have been reported by Han et al (2008), Liu and Jia (2011), Min et al (2001Min et al ( , 2005a, Wang et al(2005Wang et al( , 2006, and Zhang et al (2006). A recent study by Dai et al (2015b) revealed the geochemical and mineralogical characteristics for the coal-hosted uranium deposit that is hosted in the middle Jurassic Xishanyao Formation (J 2 x) on the southern margin of the Yili basin.…”

Section: Introductionmentioning

confidence: 73%

Petrological, mineralogical, and geochemical compositions of Early Jurassic coals in the Yining Coalfield, Xinjiang, China

Jiang

Zhao

Zhou

et al. 2015

International Journal of Coal Geology

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“…The discordance of the pitchblende U–Pb age is attributed to (1) the loss of radiogenic lead, which is crystallographically incompatible with pitchblende, and/or (2) the gain of radioactive daughters of uranium (Min et al ., , ). The two upper U–Pb intercepts of 801 ± 57 Ma and 759 ± 100 Ma are interpreted as the ages of uranium mineralization of the Sanqiliu deposit; the two lower intercepts of 304 ± 15 Ma and 295 ± 44 Ma are thought to date the Late Carboniferous to Early Permian fractionation of uranium and lead (Fig.…”

Section: Discussionmentioning

confidence: 99%

Cooling and exhumation of the oldest Sanqiliu uranium ore system in Motianling district, South China Block

et al. 2015

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The Sanqiliu uranium deposit belongs to a uranium ore system in Motianling district. It is the oldest uranium deposit in South China. Primary uranium mineralization occurred almost simultaneously with the emplacement of the host granites and subsequent dykes, and it has a relatively high grade of uranium (0.421%). We clarify the age of mineralization and investigate the cooling history through new pitchblende U-Pb and apatite fission-track thermochronology. The pitchblende U-Pb results indicate that uranium mineralization occurred at 801-759 Ma. Fractionation of uranium and lead at~374-295 Ma is interpreted as remobilization and resetting of the original uranium. The Motianling area has apatite fission-track ages of 57 to 18 Ma. By combining our results with previous work, we conclude that the deposit cooled slowly and was exposed at the surface during the Cenozoic. The timing and depth of exhumation helped to preserve and avoid erosion of the uranium deposit, and highlight the potential for regional uranium exploration.

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An excellent fossil wood cell texture with primary uranium minerals at a sandstone-hosted roll-type uranium deposit, NW China

Cited by 42 publications

References 8 publications

Relationship between Chamosite Alteration and Fe-Plugging in Sandstone Pores during Acid In Situ Leaching of Uranium

Relationship between Chamosite Alteration and Fe-Plugging in Sandstone Pores during Acid In Situ Leaching of Uranium

Petrological, mineralogical, and geochemical compositions of Early Jurassic coals in the Yining Coalfield, Xinjiang, China

Cooling and exhumation of the oldest Sanqiliu uranium ore system in Motianling district, South China Block

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