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Geochemical fixation of rare earth elements into secondary minerals in sandstones beneath a natural fission reactor at Bangombé, Gabon

https://hiroshima.repo.nii.ac.jp/records/2006926
https://hiroshima.repo.nii.ac.jp/records/2006926
ec24079e-fa5d-4c3b-989e-47bb4dbb8ae9
名前 / ファイル ライセンス アクション
GCA_69_685.pdf GCA_69_685.pdf (1.7 MB)
Item type デフォルトアイテムタイプ_(フル)(1)
公開日 2023-03-18
タイトル
タイトル Geochemical fixation of rare earth elements into secondary minerals in sandstones beneath a natural fission reactor at Bangombé, Gabon
言語 en
作成者 Hidaka, Hiroshi

× Hidaka, Hiroshi

en Hidaka, Hiroshi

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Janeczek, Janusz

× Janeczek, Janusz

en Janeczek, Janusz

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Skomurski, Francis N.

× Skomurski, Francis N.

en Skomurski, Francis N.

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Ewing, Rodney C.

× Ewing, Rodney C.

en Ewing, Rodney C.

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Gauthier-Lafaye, Francois

× Gauthier-Lafaye, Francois

en Gauthier-Lafaye, Francois

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利情報
権利情報 Copyright (c) 2005 Elsevier Ltd
主題
主題Scheme NDC
主題 440
内容記述
内容記述 To study geochemical processes for migration and fixation of fissiogenic rare earth elements (REE) in association with uranium dissolution, in situ isotopic analyses using an ion microprobe were performed on U- and REE-bearing secondary minerals, such as coffinite, françoisite, uraniferous goethite, and uraninite found in a sandstone layer 30 to 110 cm beneath a natural fission reactor at Bangombé, Gabon. Phosphate minerals such as phosphatian coffinite and françoisite with depleted 235U (235U/238U = 0.00609 to 0.00638) contained large amount of fissiogenic light REE, while micro-sized uraninite grains in a solid bitumen aggregate have normal U isotopic values (235U/238U = 0.00725) and small amount of fissiogenic REE components. The proportions of fissiogenic and non-fissiogenic REE components in four samples from the core of BAX03 vary in depth ranging from 30 cm to 130 cm beneath the reactor, which suggests mixing between fissiogenic isotopes from the reactor and non-fissiogenic isotopes from original minerals in the sandstone. Significant chemical fractionation was observed between Ce and the other REE in the secondary minerals, which shows evidence of an oxidizing atmosphere during their formation. Pb-isotopic analyses of individual minerals do not directly provide chronological information because of the disturbance of U-Pb decay system due to recent geologic alteration. However, systematic Pb-isotopic results from all of the minerals reveal the mobilization of fissiogenic isotopes, Pb and U from the reactor in association with dolerite dyke intrusion ∼0.798 Ga ago and the formation of the secondary minerals by mixing event between 2.05 Ga-old original minerals and reactor materials due to recent alteration.
言語 en
出版者
出版者 Elsevier Ltd
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
出版タイプ
出版タイプ AO
出版タイプResource http://purl.org/coar/version/c_b1a7d7d4d402bcce
関連情報
識別子タイプ DOI
関連識別子 10.1016/j.gca.2004.07.019
関連情報
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 http://dx.doi.org/10.1016/j.gca.2004.07.019
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0016-7037
収録物識別子
収録物識別子タイプ NCID
収録物識別子 AA00655038
開始ページ
開始ページ 685
書誌情報 Geochimica et Cosmochimica Acta
Geochimica et Cosmochimica Acta

巻 69, 号 3, p. 685-694, 発行日 2005-02
旧ID 15030
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