Serveur d'exploration H2N2

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Radiolysis evidenced by H2-O2 and H2-bearing fluid inclusions in three uranium deposits

Identifieur interne : 000308 ( France/Analysis ); précédent : 000307; suivant : 000309

Radiolysis evidenced by H2-O2 and H2-bearing fluid inclusions in three uranium deposits

Auteurs : Jean Dubessy [France] ; Maurice Pagel [France] ; Jean-Michel Beny [France] ; Hilbert Christensen [Suède] ; Bernard Hickel [France] ; Charles Kosztolanyi [France] ; Bernard Poty [France]

Source :

RBID : ISTEX:DD7174B091363614609E300FB5C5F3A90A283DE8

English descriptors

Abstract

Abstract: H2 with or without O2 has been identified by Raman spectroscopy in fluid inclusions in quartz from three Precambrian uranium deposits: Oklo (Gabon), Rabbit Lake and Cluff Lake D (Saskatchewan, Canada). In the Oklo uranium deposit, heterogeneous trapping of fluids in the system H2O-H2-CH4-salts is spatially associated with the natural nuclear reaction zones. At Rabbit Lake and Cluff Lake D, fluid inclusions show heterogeneous trapping of an aqueous liquid phase and a vapour phase with variable X(O2)X(H2) ratios always greater than one.H2 and O2 formation is discussed in terms of chemical reactions, chemical reactions indirectly induced by nuclear reactions and radiolytic processes. Numerical calculations of water radiolysis were carried out for two models: 1) water at the contact with an uranium oxide and 2) water inside a fluid inclusion containing either dissolved uranium or a small UO2 crystal. The concentrations of O2 and H2 inside fluid inclusions from Rabbit Lake and Cluff Lake D deposits are consistent with the first model.In the Oklo deposit, the H2-bearing fluid inclusions found in the quartz and the anomalous high OC atomic ratio of organic matter from nuclear reactor zones could result from radiolysis of water and organic matter due to the fission products of the chain nuclear reactions, but α radiolysis is not definitely ruled out.

Url:
DOI: 10.1016/0016-7037(88)90269-4


Affiliations:


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ISTEX:DD7174B091363614609E300FB5C5F3A90A283DE8

Le document en format XML

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<term>Academic press</term>
<term>Aqueous inclusions</term>
<term>Aqueous phase</term>
<term>Atomic layer</term>
<term>Atomic ratio</term>
<term>Bulk homogenization temperature</term>
<term>Bunsenges phys</term>
<term>Carbonaceous matter</term>
<term>Chem</term>
<term>Chemical processes</term>
<term>Chemical reactions</term>
<term>Chloritic matrix</term>
<term>Cluff</term>
<term>Cluff lake</term>
<term>Comm</term>
<term>Cosmochim</term>
<term>Cycles steps</term>
<term>Deposit</term>
<term>Dhamelincourt</term>
<term>Dubessy</term>
<term>Earth planet</term>
<term>Effet raman</term>
<term>Experimental data</term>
<term>First type</term>
<term>Fission</term>
<term>Fission products</term>
<term>Fission reactions</term>
<term>Fluid</term>
<term>Fluid inclusion</term>
<term>Fluid inclusion studies</term>
<term>Fluid inclusions</term>
<term>Fluid inclusions show</term>
<term>Fluid phase inclusions</term>
<term>Fractionation factors</term>
<term>Fracture plane</term>
<term>Franceville basin</term>
<term>Free hydrogen</term>
<term>Gabon</term>
<term>Gaseous phase</term>
<term>Geochim</term>
<term>Geol</term>
<term>Geological fluids</term>
<term>Geometrical model</term>
<term>Geothermal systems</term>
<term>Ground water</term>
<term>High uranium concentrations</term>
<term>Higher temperatures</term>
<term>Homogenization</term>
<term>Homogenization temperatures</term>
<term>Host crystal</term>
<term>Host rocks</term>
<term>Hydrocarbons radiolysis</term>
<term>Iaea</term>
<term>Inclusion</term>
<term>Inclusions fluides</term>
<term>Individual phases</term>
<term>Isotope</term>
<term>Isotopic</term>
<term>Isotopic equilibrium</term>
<term>Isotopic fractionation</term>
<term>Laser</term>
<term>Laser beam</term>
<term>Liquid water</term>
<term>Maximum path</term>
<term>Mineralization</term>
<term>Molar fraction</term>
<term>Mole</term>
<term>Mole percent</term>
<term>Molecular hydrogen</term>
<term>Natural fission reactors</term>
<term>Natural waters</term>
<term>Nauk sssr</term>
<term>Northern saskatchewan</term>
<term>Nuclear reactions</term>
<term>Nuclear reactor zone</term>
<term>Nuclear reactor zones</term>
<term>Nuclear zone</term>
<term>Oklo</term>
<term>Oklo deposit</term>
<term>Oklo uranium</term>
<term>Oklo uranium deposit</term>
<term>Organic matter</term>
<term>Other hand</term>
<term>Oxide</term>
<term>Oxidizing radicals</term>
<term>Pagel</term>
<term>Phase change</term>
<term>Phase equilibrium</term>
<term>Plasma lines</term>
<term>Pore space</term>
<term>Possible mechanism</term>
<term>Proc</term>
<term>Quartz</term>
<term>Quartz crystals</term>
<term>Quartz veins</term>
<term>Rabbit lake</term>
<term>Rabbit lake uranium deposit</term>
<term>Radioactive chain</term>
<term>Radioactive series</term>
<term>Radioactive transformations</term>
<term>Radiochemical processes</term>
<term>Radiochemical reactions</term>
<term>Radiolysis</term>
<term>Radiolytic</term>
<term>Radiolytic process</term>
<term>Radiolytic processes</term>
<term>Raman</term>
<term>Raman microprobe</term>
<term>Raman spectroscopy</term>
<term>Reaction zone</term>
<term>Reactor zone</term>
<term>Reactor zones</term>
<term>Redox state</term>
<term>Room temperature</term>
<term>Saskatchewan</term>
<term>Simultaneous radiolysis</term>
<term>Solid angle</term>
<term>Special paper</term>
<term>Uranium</term>
<term>Uranium atoms</term>
<term>Uranium concentration</term>
<term>Uranium deposit</term>
<term>Uranium deposition</term>
<term>Uranium deposits</term>
<term>Uranium ores</term>
<term>Uranium oxide</term>
<term>Uranium oxides</term>
<term>Vapour</term>
<term>Vapour phase</term>
<term>Volumetric fraction</term>
<term>Volumetric ratio</term>
<term>Water layer</term>
<term>Water radiolysis</term>
<term>Water reservoir</term>
<term>Wiley sons</term>
<term>Zone</term>
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<div type="abstract" xml:lang="en">Abstract: H2 with or without O2 has been identified by Raman spectroscopy in fluid inclusions in quartz from three Precambrian uranium deposits: Oklo (Gabon), Rabbit Lake and Cluff Lake D (Saskatchewan, Canada). In the Oklo uranium deposit, heterogeneous trapping of fluids in the system H2O-H2-CH4-salts is spatially associated with the natural nuclear reaction zones. At Rabbit Lake and Cluff Lake D, fluid inclusions show heterogeneous trapping of an aqueous liquid phase and a vapour phase with variable X(O2)X(H2) ratios always greater than one.H2 and O2 formation is discussed in terms of chemical reactions, chemical reactions indirectly induced by nuclear reactions and radiolytic processes. Numerical calculations of water radiolysis were carried out for two models: 1) water at the contact with an uranium oxide and 2) water inside a fluid inclusion containing either dissolved uranium or a small UO2 crystal. The concentrations of O2 and H2 inside fluid inclusions from Rabbit Lake and Cluff Lake D deposits are consistent with the first model.In the Oklo deposit, the H2-bearing fluid inclusions found in the quartz and the anomalous high OC atomic ratio of organic matter from nuclear reactor zones could result from radiolysis of water and organic matter due to the fission products of the chain nuclear reactions, but α radiolysis is not definitely ruled out.</div>
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