A Progress in Geochemistry and Mineralogy of Natural Fission Reactors

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Geochemistry and Geochronology".

Deadline for manuscript submissions: closed (15 June 2020) | Viewed by 2147

Special Issue Editor


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Guest Editor
Department of Geochemistry, Mineralogy and Petrography, University of Silesia in Katowice, ul. Będzińska 60, 41-200 Sosnowiec, Poland
Interests: mineralogy; environmental mineralogy; geochemistry; disposal of radioactive waste

Special Issue Information

Dear Colleague,

Approximately 2 Ga ago, spontaneous fission reactions occurred in uranium deposits at Oklo and Bangombé in the Franceville Basin of SE Gabon. Natural fission reactors have been studied extensively since their discovery in 1972, with the purpose of understanding their origin and physics. The behavior of fission products and actinides in and around the natural reactors has also drawn the attention of investigators, because the results are pertinent to understanding the behavior of these elements in natural systems that may be used as radioactive waste repositories. Despite an impressive amount of data on geology, geochemistry, mineralogy, and physics of the natural reactors, there are still unresolved problems, including the reactors’ evolution and mechanisms of radionuclides and fission products’ release from uraninite and retardation. From a mineralogical perspective, the uniqueness of the natural fission reactors lies in their isotope geochemistry and isotope mineralogy. They are the only places on Earth where some minerals are composed of elements with nonprimordial isotopic abundances. While all natural reactors except one are no more accessible to investigators, there has been ongoing research based on well-documented, previously-collected samples and on the investigation of the Bangombé reactor. This Special Issue aims to publish papers on recent advances in geochemical and mineralogical investigations of natural fission reactors. Review papers emphasizing results obtained during the last two decades are also welcome.

Prof. Dr. Janusz Janeczek
Guest Editor

Manuscript Submission Information

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Keywords

  • natural fission reactors
  • geochemistry
  • geochronology
  • mineralogy

Published Papers (1 paper)

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Review

13 pages, 2965 KiB  
Review
A Review of In Situ Isotopic Studies of the Oklo and Bangombé Natural Fission Reactors Using Microbeam Analytical Techniques
by Hiroshi Hidaka
Minerals 2020, 10(12), 1060; https://doi.org/10.3390/min10121060 - 27 Nov 2020
Cited by 3 | Viewed by 1903
Abstract
Isotopic analyses of elements in the natural reactor materials have often been performed to understand the distribution behaviors of the fission products and to evaluate the function of nuclear reactions since the first discovery of a natural reactor in 1972. Several types of [...] Read more.
Isotopic analyses of elements in the natural reactor materials have often been performed to understand the distribution behaviors of the fission products and to evaluate the function of nuclear reactions since the first discovery of a natural reactor in 1972. Several types of unique microminerals, including significant amounts of fission products, have been found in and around the Oklo and the Bangombé natural reactors. In the past two decades, microbeam techniques using ion and laser probe facilities have been effectively applied for the in situ isotopic analyses of individual microminerals to investigate the migration behaviors of fissiogenic radioisotopes produced in the reactors. This paper presents a review of interpretations of the isotopic results of microminerals found in and around the natural reactors. Full article
(This article belongs to the Special Issue A Progress in Geochemistry and Mineralogy of Natural Fission Reactors)
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