Radiolysis evidenced by H 2 -O 2 and H 2 -bearing fluid inclusions in three uranium deposits

Details Radiolysis evidenced by H 2 -O 2 and H 2 -bearing fluid inclusions in three uranium deposits Radiolysis evidenced by H 2 -O 2 and H 2 -bearing fluid inclusions in three uranium deposits

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1155d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 5, pp.1155-1167

Physics

11

Scientific paper

H 2 with or without O 2 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 H 2 O-H 2 -CH 4 -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 ( O 2 )/ X ( H 2 ) ratios always greater than one. H 2 and O 2 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 UO 2 crystal. The concentrations of O 2 and H 2 inside fluid inclusions from Rabbit Lake and Cluff Lake D deposits are consistent with the first model. In the Oklo deposit, the H 2 -bearing fluid inclusions found in the quartz and the anomalous high O / C 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 radiolysis is not definitely ruled out.

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