Some Geochemical and Mineralogical Pecularities of Deposits of Radioactive Materials as Evidence for Radiolysis in Nature

Vovk, I.F.

doi:10.1007/978-94-009-3465-8_20

Cited by 8 publications

(2 citation statements)

References 9 publications

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“…Redox conditions play a vital role in the alteration, paragenesis and precipitation of variable-valence elements (Stashchuk, 1972;Vovk, 1987), and are essential for organic matter degradation and preservation (Ding et al, 2019; , 2019). Redox-sensitive trace elements, such as V, Ni, Co, U, Cu, Cr, and Mn, exhibit strong enrichment under reducing conditions and hardly migrate during diagenesis (Kemp et al, 1994;Thomson et al, 1998;Pi et al, 2014;Lu et al, 2019;Tan et al, 2021), and are known as important redox indicators of ancient sedimentary water bodies (Dypvik, 1984;Powell et al, 2003;Li et al, 2016;Cheng et al, 2018;Liu et al, 2019a;Ali et al, 2022).…”

Section: Redox Conditionsmentioning

confidence: 99%

Episodic hydrothermal activities impact on organic matter enrichment in the post-collision rift basin of Permian Lucaogou Formation, southern Junggar Basin, NW China

Jiao

Zhou

et al. 2023

Front. Earth Sci.

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The factors controlling the organic matter accumulation in the organic-rich shale of the Lucaogou Formation in the southern Junggar Basin, remain controversial. To more explicitly reveal the hydrothermal events and its mechanism on the organic matter enrichment, we performed mineralogy and geochemistry methods on dolomite and black shale samples from Well FK-1 in Fukang Sag. The high (Fe + Mn)/Ti ratios, the enrichment of Ca, Mg, Fe, Mn, and REY, and multiple hydrothermal minerals (e.g., ankerite, dolomite, zeolite, authigenic albite, and microcline) suggest five episodes of hydrothermal events. In addition, the low-to-high-varied Sr/Ba, V/(V + Ni) (Al + Fe)/(Ca + Mg), and Sr/Cu ratios, as well as the dolomite formation all well indicate a brackish-saline, suboxic-anoxic, shallow to deep water condition under a warm-humid to hot-arid climate with rhythmic sedimentation. The fluctuated total organic carbon content (up to 12.16 wt%) suggest the periodic organic matter accumulation. Three patterns of organic matter enrichment occurred during the rift-drift transition of the southern Junggar Basin, productivity and preservation played distinguishing roles in different intervals. Productivity periodically fluctuated because of the episodic hydrothermal events and warm-humid climate changes. Preservation was triggered by the saline, anoxic, and well-stratified water setting under the relatively hot-arid climate, which became progressively favorable in the gradually stabilized basin.

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Section: Redox Conditionsmentioning

confidence: 99%

Episodic hydrothermal activities impact on organic matter enrichment in the post-collision rift basin of Permian Lucaogou Formation, southern Junggar Basin, NW China

Jiao

Zhou

et al. 2023

Front. Earth Sci.

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“…Figure 1 shows that there exists a reverse correlation between the iodine and uranium content (radioactivity) in the solid phase of the shale which can be interpreted as a consequence of natural radiolysis. Further indications for this process in relation to iodine behaviour in the geosphere can be found in uranium deposits and in the basins of very old (connate) groundwaters, which are investigated lately as natural analogues [6,23] or possible surroundings of radioactive waste repositories. …”

Section: Evidence For Radiolysis In Nature Relevant To Iodine Migrationmentioning

confidence: 99%

Radiolysis as a Factor Influencing Migration Behaviour of Iodine in the Geosphere

Vovk

1988

Radiochimica Acta

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Iodine /Radiation chemistry /GeochemistrySummary This paper provides a literature review of the studies which elucidate the influence of radiolysis on the migration of iodine in the geosphere in relation to safety assessments of underground disposal of 119 1 and lead as well to a better understanding of the geochemistry of this element. Radiation has been shown in a number of publications to have a considerable effect on the chemical behaviour of iodine in aqueous solutions, water-rock and similar heterogeneous systems. Some geochemical features of iodine in uranium deposits and in very old formation waters manifesting its radiolytic behaviour in nature are also discussed.

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Effect of groundwater radiolysis on the wall-rock alteration of uranium ore deposits

Maozhong

Junqi

Wang

1994

Chin. J. of Geochem.

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Some Geochemical and Mineralogical Pecularities of Deposits of Radioactive Materials as Evidence for Radiolysis in Nature

Cited by 8 publications

References 9 publications

Episodic hydrothermal activities impact on organic matter enrichment in the post-collision rift basin of Permian Lucaogou Formation, southern Junggar Basin, NW China

Episodic hydrothermal activities impact on organic matter enrichment in the post-collision rift basin of Permian Lucaogou Formation, southern Junggar Basin, NW China

Radiolysis as a Factor Influencing Migration Behaviour of Iodine in the Geosphere

Effect of groundwater radiolysis on the wall-rock alteration of uranium ore deposits

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